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The heart has the main function of pumping oxygen and nutrients to the organs of the body  The upper chambers have a capacity of 50 ml of blood the lower cavities have a somewhat higher capacity: 60 ml of blood.

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LUNGS>

Alveoli

Red blood cells

The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are the lungs, which carry out this exchange of gases as we breathe.

The lungs: The lungs are a pair of spongy, air-filled organs located on either side of the chest (thorax). The trachea (windpipe) conducts inhaled air into the lungs through its tubular branches, called bronchi.

Alveoli: Alveoli are an important part of the respiratory system whose function it is to exchange oxygen and carbon dioxide molecules to and from the bloodstream.

Red blood cells: Red blood cells: The blood cells that carry oxygen. Red cells contain hemoglobin and it is the hemoglobin which permits them to transport oxygen (and carbon dioxide). Hemoglobin, aside from being a transport molecule, is a pigment. It gives the cells their red color (and their name).

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How the body faces bacterial infections?

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How the body faces bacterial infections?

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Bacterial infections are common, and their effects vary. There are a number of different bacteria that can cause illness, and you can become exposed to them in a variety of ways.

- Bacteria are small organisms that can invade the body, causing illness. These infections usually trigger a protective immune response. You also have innate bacteria in your body that helps digest your food and protect your body from harmful bacteria.
- An infection occurs when another organism enters your body and causes disease. The organisms that cause infections are very diverse and can include things like viruses, bacteria, fungi, and parasites.

- Infectious diseases are disorders caused by organisms, such as bacteria, viruses, fungi, or parasites. Many organisms live inside and outside our bodies. They are usually harmless or even useful. But under certain conditions, some organisms can cause disease.

- Bacteria are prokaryotic microorganisms that are a few microns in size, usually between 0.5 and 5 µm in length and of various shapes, including cocci spheres, rods, curved and helical spiral filaments, and spirochetes.

Causes:

- Bacterial infections are caused by the transmission of bacteria. You can be exposed to bacteria from other people, through the environment, or from eating contaminated food or drinking contaminated water
- Bacteria must enter your body for them to cause an infection. So you can get a bacterial infection through an opening in your skin, such as a cut, a bug bite, or a surgical wound. Bacteria may also enter your body through your airway and cause infections like bacterial pneumonia.
- Many human infections are caused by either bacteria or viruses. Bacteria are tiny single-celled organisms, thought by some researchers to be related to plants. They are among the most successful life forms on the planet, and range in habitat from ice slopes to deserts.

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The only form of energy a cell can use is a molecule called adenosine triphosphate (ATP). Chemical energy is stored in the bonds that hold the molecule together. ADP can be recycled into ATP when more energy becomes available. The energy to make ATP comes from glucose.

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What is the Testicle?
- The testicles are the male gonads, which produce sperm and sex hormones (testosterone). They are the glandular organs that form the most important part of the male reproductive system.
What is the Ovaries?
- The ovaries are part of a woman's reproductive system. Women have two ovaries, one on each side of the uterus. Each ovary is the size and shape of an almond. The ovaries produce and store eggs.
What is the suprarrenal?
- The adrenal glands are small glands located on top of each kidney. They produce vital hormones, including sex hormones and cortisol.

Hypothalamus.

It is an area of the brain that produces hormones that control: Body temperature. The hunger. Moods.

Thymus.

The thymus is a primary and specialized lymphoid organ of the immune system. Within the thymus, T cells mature.

Adrenal gland.

A small gland that produces steroid hormones, epinephrine and norepinephrine These hormones help control heartbeat, blood pressure and other important body functions.

Pancreas

The pancreas is a large gland located behind the stomach and near the first part of the small intestine that secretes digestive juices into the small intestine through a tube called the pancreatic duct.

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1. What is the muscleskeletalsystem?
- The muscleskeletal system is an organ system that gives humans the ability to move using the muscular and skeletal systems. The musculoskeletal system provides shape, support, stability, and movement to the body.
- In biology, the skeletal or skeletal system is the biological system that provides support, support and protection to the soft tissues and muscles in living organisms. The skeletal system has functions of locomotion, support and protection.

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PARTS>

BRAINS

Cerebellum

Spinal cord

the senses "taste, smell, ears, touch, eyes.

Cerebellum: The cerebellum is a major feature of the hindbrain of all vertebrates. Although usually smaller than the cerebrum.

Spinal cord: The spinal cord is a long, thin, tubular structure made up of nervous tissue, which extends from the medulla oblongata in the brainstem to the lumbar region of the vertebral column.

Brain: The brain is one of the largest and most complex organs in the human body.
It is made up of more than 100 billion nerves that communicate in trillions of connections called synapses.

Sense of taste: The Taste is the ability to respond to dissolved molecules and ions called tastants. Humans detect taste with taste receptor cells.

Sense of smell: Olfaction, or the sense of smell, is the process of creating the perception of smell. It occurs when an odor binds to a receptor within the nose, transmitting a signal through the olfactory system. Olfaction has many purposes, including detecting hazards, pheromones, and plays a role in taste.

sight sense: “Seeing” is often used synonymously for “observing” or “understanding”. Yet in actual fact, your eyes only see colours and light and dark. You can see shapes, motion and proportions because your eyes move and work together with the senses of movement and balance.

Sense of hear: Hearing is a mechanical sense. It turns physical movement into the electrical signals that make up the language of the brain, translating these vibrations into what we experience as the world of sound.