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Body Systems● At this site students can pick a system and click through all the organs at their own pace.

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Body Systems● At this site students can pick a system and click through all the organs at their own pace.

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Keeping our reviews and guides up-to-date

In the sprawling and evolving home health industry, not a week goes by without the introduction of new products, services, or brand new companies. We constantly update our reviews and guides to deliver the latest, most accurate recommendations. You can count on us.

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Research for Your Most Important Health Purchases

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Keeping our reviews and guides up-to-date In the sprawling and evolving home health industry, not a week goes by without the introduction of new products, services, or brand new companies. We constantly update our reviews and guides to deliver the latest, most accurate recommendations. You can count on us.

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Even before you eat, when you smell a tasty food, see it, or think about it, digestion begins. Find out how the digestive system works, from start to finish, in this video!

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Larger text size Large text size Regular text size Even before you eat, when you smell a tasty food, see it, or think about it, digestion begins. Find out how the digestive system works, from start to finish, in this video! ;

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Animation: Organs of Digestion (See related pages)

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Video of the respiratory and circulatory system

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Video of the respiratory and circulatory system

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Same as the silly digestive video but with circulatory system

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Same as the silly digestive video but with circulatory system

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Watch this movie about your heart and circulatory system, which sends blood throughout your body.

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Human Circulatory System Video - Heart, Arteries, Capillaries, Blood & Veins

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Learn how the heart, arteries, capillaries and veins work together to pump oxygen rich blood around the human body.

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Map of the Human Heart

Day and night, the muscles of your heart contract and relax to pump blood throughout your body. In the Step Thru below, see the complicated path the blood takes as it moves in and out of the heart.

Step Thru Animation

1. Oxygen-poor blood (shown in blue) flows from the body into the right atrium.

2. Blood flows through the right atrium into the right ventricle.

3. The right ventricle pumps the blood to the lungs, where the blood releases waste gases and picks up oxygen.

4. The newly oxygen-rich blood (shown in red) returns to the heart and enters the left atrium.

5. Blood flows through the left atrium into the left ventricle.

6. The left ventricle pumps the oxygen-rich blood to all parts of the body.

Anatomy

Do right and left seem backward? That's because you're looking at an illustration of somebody else's heart. To think about how your own heart works, imagine wearing this illustration on your chest.

aorta

superior vena cava

right atrium

inferior vena cava

pulmonary valve

tricuspid valve

right ventricle

mitral valve

left ventricle

pulmonary artery

aortic valve

left atrium

Heart Facts

Put your hand on your heart. Did you place your hand on the left side of your chest? Many people do, but the heart is actually located almost in the center of the chest, between the lungs. It's tipped slightly so that a part of it sticks out and taps against the left side of the chest, which is what makes it seem as though it is located there.

Hold out your hand and make a fist. If you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists.

Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard-twice as hard as the leg muscles of a person sprinting.

The aorta, the largest artery in the body, is almost the diameter of a garden hose. Capillaries, on the other hand, are so small that it takes ten of them to equal the thickness of a human hair.

Feel your pulse by placing two fingers at pulse points on your neck or wrists. The pulse you feel is blood stopping and starting as it moves through your arteries. As a kid, your resting pulse might range from 90 to 120 beats per minute. As an adult, your pulse rate slows to an average of 72 beats per minute.

Your body has about 5.6 liters (6 quarts) of blood. This 5.6 liters of blood circulates through the body three times every minute. In one day, the blood travels a total of 19,000 km (12,000 miles)-that's four times the distance across the U.S. from coast to coast.

The heart pumps about 1 million barrels of blood during an average lifetime-that's enough to fill more than 3 super tankers.

Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.

lub-DUB, lub-DUB, lub-DUB. Sound familiar? If you listen to your heart beat, you'll hear two sounds. These "lub" and "DUB" sounds are made by the heart valves as they open and close.

Producers:

Kate Hudec & Susan K. Lewis

Designers:

Kim Ducharme & Tyler Howe

Developers:

Brenden Kootsey & Daniel Hart

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Day and night, the muscles of your heart contract and relax to pump blood throughout your body. In the Step Thru below, see the complicated path the blood takes as it moves in and out of the heart. Step Thru Animation Oxygen-poor blood (shown in blue) flows from the body into the right atrium.

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Map of the Human Heart

Day and night, the muscles of your heart contract and relax to pump blood throughout your body. In the Step Thru below, see the complicated path the blood takes as it moves in and out of the heart.

Step Thru Animation

1. Oxygen-poor blood (shown in blue) flows from the body into the right atrium.

2. Blood flows through the right atrium into the right ventricle.

3. The right ventricle pumps the blood to the lungs, where the blood releases waste gases and picks up oxygen.

4. The newly oxygen-rich blood (shown in red) returns to the heart and enters the left atrium.

5. Blood flows through the left atrium into the left ventricle.

6. The left ventricle pumps the oxygen-rich blood to all parts of the body.

Anatomy

Do right and left seem backward? That's because you're looking at an illustration of somebody else's heart. To think about how your own heart works, imagine wearing this illustration on your chest.

aorta

superior vena cava

right atrium

inferior vena cava

pulmonary valve

tricuspid valve

right ventricle

mitral valve

left ventricle

pulmonary artery

aortic valve

left atrium

Heart Facts

Put your hand on your heart. Did you place your hand on the left side of your chest? Many people do, but the heart is actually located almost in the center of the chest, between the lungs. It's tipped slightly so that a part of it sticks out and taps against the left side of the chest, which is what makes it seem as though it is located there.

Hold out your hand and make a fist. If you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists.

Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body. Even at rest, the muscles of the heart work hard-twice as hard as the leg muscles of a person sprinting.

The aorta, the largest artery in the body, is almost the diameter of a garden hose. Capillaries, on the other hand, are so small that it takes ten of them to equal the thickness of a human hair.

Feel your pulse by placing two fingers at pulse points on your neck or wrists. The pulse you feel is blood stopping and starting as it moves through your arteries. As a kid, your resting pulse might range from 90 to 120 beats per minute. As an adult, your pulse rate slows to an average of 72 beats per minute.

Your body has about 5.6 liters (6 quarts) of blood. This 5.6 liters of blood circulates through the body three times every minute. In one day, the blood travels a total of 19,000 km (12,000 miles)-that's four times the distance across the U.S. from coast to coast.

The heart pumps about 1 million barrels of blood during an average lifetime-that's enough to fill more than 3 super tankers.

Your heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.

lub-DUB, lub-DUB, lub-DUB. Sound familiar? If you listen to your heart beat, you'll hear two sounds. These "lub" and "DUB" sounds are made by the heart valves as they open and close.

Producers:

Kate Hudec & Susan K. Lewis

Designers:

Kim Ducharme & Tyler Howe

Developers:

Brenden Kootsey & Daniel Hart

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Day and night, the muscles of your heart contract and relax to pump blood throughout your body. In the Step Thru below, see the complicated path the blood takes as it moves in and out of the heart. Step Thru Animation Oxygen-poor blood (shown in blue) flows from the body into the right atrium.

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The Nervous System- Animation-Video for Kids -from www.makemegenius.com

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The Nervous System- Animation-Video for Kids -from www.makemegenius.com

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ABCya! * Learn the Skeletal System - A Fun & Interactive Game

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ABCya! A fun and interactive children's activity to learn the skeletal system. Students click and drag the names of major bones to the appropriate box in the skeletal diagram. The number of attempts to complete the activity is recorded - the lower the score the better. Have a blast with this educational science game.

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An in-depth review of the human skeletal system and its different parts and bones, featuring the beautiful GetBodySmart diagrams and illustrations. Click and start learning now!

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Build-A-Body: Skeletal System - GameUp - BrainPOP.

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In this interactive and free science game, players use drag and drop interactives to build a human skeletal system. Then their bone-knowledge is Q-and-A tested!

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Build-A-Body: Skeletal System - GameUp - BrainPOP.

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In this interactive and free science game, players use drag and drop interactives to build a human skeletal system. Then their bone-knowledge is Q-and-A tested!

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The digestive and excretory systems review

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Read and learn for free about the following article: The digestive and excretory systems review

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The Integumentary System, Part 1 - Skin Deep: Crash Course Anatomy & Physiology #6

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Need help with your Anatomy and Physiology I homework? Learners examine the structure and function of skin including the production of melanin.

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The muscular system is one of the most fascinating aspects of the body. It consists of a variety of cells including neurons and muscle cells. Without it, we would not be able to function efficiently. It can be a complex system to understand, so I am going to lay out the basics while introducing you to some terms you might not have heard of.

Location and Locomotion of Muscles

There are two important terms to know when referring to location of muscles. The first is somatic, which refers to muscles that are directly associated with moving the body. These muscles can be controlled and are considered to be voluntary. An example of a somatic muscle would be the diaphragm.

The second type is visceral muscles. Visceral muscles include the blood vessels and gut, and they are usually smooth. Visceral muscle s are not voluntary. Somatic vessels are usually, but not always, associated with the appendicular skeleton (the limbs) and visceral is typically associated with the axial skeleton (center of the body, or the axis.)

There are also different forms of locomotion related to muscles. The first type is saltational, which refers to having powerful legs and having forelimbs different from the hindlimbs. An example would be a cat or dog. The next type is cursorial, which means that the organism has no real muscles in the fingers and toes. Human s would be an example of this.

Finally, there is aerial locomotion. These organisms, such as birds, have a reduced spine and more bone fusion. Otherwise, birds would constantly be working against themselves and would not be efficient fliers. Organism s may not belong to only one category, but may belong to more.

Cell Types: What Makes Them Unique?

The types of muscle cells are very interesting because there are many similarities, but there are also many differences. Smooth muscle is the most unique because it has very little in common with the other types. It is weaker and less organized. Smooth muscles can be found in your stomach and intestine s.

Like cardiac muscle cells, contraction of smooth muscle is involuntary and uninucleate. Cardiac muscle cells have a few unique characteristics including automaticity and autorhythymicity. Automaticity means that the single cells of the heart are able to contract on their own and autorhythymicity means that the contractions of the cell s are synchronous.

Furthermore, cardiac muscle cells also have intercalated disks, or desmosomes, that allow the cells to stick together. Skeletal muscle cells and cardiac cells have striations (or divisions) but that is where the similarities end. When you think of muscles, the image that comes to mind is most likely a skeletal muscle. These muscle cells are long and have many nuclei. An example of a skeletal muscle would be your triceps and biceps.

Muscle Anatomy and Contractions Made Simple

Muscle contractions are controlled by the muscle fibers, which are composed of muscle cells. One important thing to remember about these fibers is that strength is not equal at all lengths. In general, shorter muscles are stronger. Length allows speed, which is a result of the sarcomeres ( functional unit of the muscle cell) contract at the same speed, but a long muscle, such as in your leg s, can cover a larger distance in a short amount of time.

Insertion of the muscle also has an impact. If the insertion is (farther from the body's axis) the muscle is stronger but slower. Likewise, if the insertion is proximal (closer to the body's axis), the muscle will act faster, buy will not be as strong. A stimulation frequency exists that allows muscle s to only use the amount of energy that is needed.

Muscle contractions begin in the central nervous system, and this applies for voluntary and involuntary movement. This causes a motor neuron (a nerve cell specific to movement) to activate. The axon of the neuron carries a signal (called an action potential), which is taken to the ends of the muscle fibers.

Next, a neurotransmitter called acetylcholine (or ACH) is released and causes the action potential to travel through the muscle fibers. Finally, calcium ions are released, which triggers troponin and tropomyosin to move along the fibers. All of these steps lead to the contraction of a muscle. It is also important to remember that all muscle types contract in a similar manner.

Muscles also exhibit something called fused tetanus. This term is used to describe a muscle that is unable to relax between impulses. The contraction steps are complicated, but this gives you the most important information about how muscle s allow us to move.

Now, you have all the basic knowledge of the muscular system and probably some information you may not have known. The subtle differences between cell types and locomotion are part of what makes the system interesting, and efficient. I hope you enjoyed reading and learned something new.

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The Muscular System: How We Move Around - Interactive Biology, with Leslie Samuel

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The muscular system is one of the most fascinating aspects of the body. It consists of a variety of cells including neurons and muscle cells. Without it, we would not be able to function efficiently. It can be a complex system to understand, so I am going to lay out the basics while introducing you ...

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Muscular system, front view (Easy)

Descripción

Do you know what is the name of each muscle shown on the human body picture? Test yourself with this interactive game, you have to choose the right answer from a list of several options.

Zoom in or zoom out the image in order to adjust it to the size of your desktop's device. You also can click on it and drag to centre the image.

Información geográfica

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Muscular system, front view (Easy) Human body game. What's the name?

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Do you know what is the name of each muscle shown on the human body picture? Test yourself with this interactive game, you have to choose the right answer from a list of several options. Zoom in or zoom out the image in order to adjust it to the size of your desktop's device.