Скачать или смотреть Artery, Vein and Capillaries.

Artery, Vein and Capillaries.
Arteries:
Function: Carry oxygenated blood away from the heart to the body's tissues (with the exception of the pulmonary arteries, which carry deoxygenated blood to the lungs).
Pressure: Blood in arteries is under high pressure due to the heart's pumping action.
Wall Structure:
Arteries have thick, elastic walls composed of three layers: the tunica intima (inner layer), tunica media (middle layer with smooth muscle), and tunica adventitia (outer layer).
Location: Generally located deeper within the body than veins

Veins:
Function: Carry deoxygenated blood from the body's tissues back to the heart (with the exception of the pulmonary veins, which carry oxygenated blood from the lungs to the heart).
Pressure: Blood in veins is under low pressure.
Wall Structure: Veins have thinner, less elastic walls than arteries and contain valves to prevent backflow of blood.
Location: Can be superficial (near the skin's surface) or deep within the body.


Capillaries are tiny blood vessels that play a crucial role in the circulatory system. They're responsible for:

1. Oxygen delivery: Capillaries allow oxygen to diffuse from the blood into tissues.
2. Nutrient exchange*: They facilitate the exchange of nutrients, like glucose and amino acids, between blood and tissues.
3. Waste removal: Capillaries help remove waste products, like carbon dioxide, from tissues.

Capillaries are characterized by:

1. Thin walls
2. Small diameter
3. Large surface area

This structure enables efficient exchange of substances between blood and tissues. Capillaries are found in various tissues and organs, including muscles, lungs, and skin.

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