Heart: A muscular organ that pumps blood through its four chambers to supply oxygenated and deoxygenated blood to the body and lungs, respectively.
Arteries, Veins, and Capillaries: Blood vessels that transport blood; arteries carry oxygen-rich blood away from the heart, veins return deoxygenated blood, and capillaries enable nutrient and gas exchange.
Pulmonary Circulation: The pathway where deoxygenated blood is sent from the heart to the lungs for oxygenation and then back to the heart.
Systemic Circulation: The pathway where oxygenated blood is distributed from the heart to the rest of the body, and deoxygenated blood is returned to the heart.
Functions: The system delivers oxygen and nutrients to cells, removes waste, regulates body temperature, supports the immune system, and distributes hormones.

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Aug 15

1. What is the circulatory system?

2. Which vein carry oxygenated blood?

3. What is the largest artery called and its function?

4. Why are veins blue?

Aug 17

Replying to

The system that contains the heart and the blood vessels and moves blood throughout the body.
The pulmonary veins.
Blood vessels include arteries, capillaries, and veins. Arteries carry blood away from the heart and can divide into large and small arteries. Large arteries receive the highest blood flow pressure and are thicker and more elastic to accommodate the high pressures.
Veins appear blue because blue light is reflected back to our eyes. ... Blue light does not penetrate human tissue as deeply as red light does.

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