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https://my.clevelandclinic.org/health/body/circulatory-and-cardiovascular-system

https://my.clevelandclinic.org/health/body/7041-digestive-system

https://www.britannica.com/science/human-respiratory-system

https://www.epa.gov/endocrine-disruption/overview-endocrine-system

https://my.clevelandclinic.org/health/body/21202-nervous-system

https://www.britannica.com/science/human-reproductive-system

https://clinicalinfo.hiv.gov/en/glossary/immune-system

https://www.khanacademy.org/science/how-does-the-human-body-work/x0fe8768432761c62:locomotion-and-movement/x0fe8768432761c62:joints-and-disorders-of-the-musculoskeletal-system/a/hs-the-musculoskeletal-system-review

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Breaks down the food we eat into smaller parts like sugars, proteins, and fats.

Takes in nutrients from food into the body through the small intestine.

Works with the circulatory system, The nutrients go into the blood and get carried to the rest of the body.

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Moves blood all around the body to carry oxygen, food, and hormones.

Takes away waste like carbon dioxide from the cells.

Works with the respiratory system: Blood picks up oxygen from the lungs and drops off carbon dioxide to be breathed out.

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What is the circulatory system's function?

Your circulatory system's three basic functions are:

Move blood throughout your body.

Bring oxygen and nutrients to your organs, muscles and tissues.

Remove waste products like carbon dioxide and your organs' chemical byproducts.

Day and night, even while you're asleep, your heart moves blood through your body in a circuit. If you follow the blood through your body, it moves from your heart into big highways for blood called arteries that deliver blood to your organs and tissues.

In your tissues, blood oxygen is exchanged for waste in tiny networks of blood vessels called capillaries. After leaving the tissues and organs, your blood returns to your heart through veins. The blood travels through your heart and lungs to get oxygenated again and repeat the process. This happens thousands of times each day, with every beat of your heart.

Your heart circulates about 2,000 gallons (more than 7,500 liters) of your blood every day. During physical activity, your heart pumps even more than usual. Your circulatory system adapts to meet your body's needs for blood and oxygen.

Your circulatory system makes it a high priority to supply blood to your heart and brain. If your brain doesn't get the blood it needs, you can lose consciousness within seconds. You can have brain damage after four minutes without blood flow. Similarly, your heart quickly starts to have trouble pumping if it's not getting enough blood.

How your circulatory and cardiovascular system works

Your cardiovascular system functions with the help of blood vessels. Some blood vessels (veins) return blood to your heart, while others (arteries) carry blood away from your heart.

Your blood vessels work with your heart and lungs to continuously move blood through your body. Here's how:

1. Your heart's right ventricle sends blood that's low in oxygen (oxygen-poor blood) to your lungs. Blood travels through the pulmonary trunk (the main pulmonary artery).

2. Your blood picks up oxygen in your lungs.

3. Pulmonary veins carry the oxygenated blood from your lungs to your heart's left atrium.

4. The left atrium sends the oxygenated blood into the left ventricle. This muscular part of your heart pumps blood out to your body through arteries.

5. As blood moves through your body and organs, it drops off nutrients, transfers hormones and hauls away waste products.

6. The veins carry deoxygenated blood and carbon dioxide back to your heart, which sends the blood to your lungs.

7. Your lungs exchange oxygen for carbon dioxide, which you then exhale.

When blood gets oxygen from your lungs and brings it back to your heart, that's your pulmonary circulation. Systemic circulation describes supplying oxygen-rich blood to your whole body.

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Your circulatory system (cardiovascular system) includes your heart and blood vessels. Your heart pumps oxygen-rich blood after your lungs add oxygen to your blood.

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Brings oxygen into your body when you breathe in.

Gets rid of carbon dioxide when you breathe out.

Works with the circulatory system: Blood carries the oxygen from the lungs to the body and brings carbon dioxide back to the lungs.

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Makes hormones that control things like growth, energy, and mood.

Helps with long-term changes like puberty.

Works with the nervous system: The brain tells glands when to release hormones.

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1. Fights off germs like viruses and bacteria.

2. Makes white blood cells to protect you from getting sick.

3. Works with the circulatory system: White blood cells travel through your blood to reach where they’re needed.

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1. Makes sperm (in boys) and eggs (in girls).

2. Helps humans have babies.

3. Works with the endocrine system: Hormones like estrogen and testosterone control how the reproductive organs grow and work.

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Sends messages between the brain and body.

Helps you think, feel, and react quickly.

Works with the musculoskeletal system: It tells your muscles when and how to move.

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Your bones and muscles help you stand, move, and stay upright.

Protects important organs like your heart and brain.

Works with the nervous system: Nerves send messages to your muscles to help you move.