Infrequent participation in physical activity can lead to<span> (A) high blood pressure during exercise.</span>
The second statement best explains the type of blood vessel and the function of these vessels' valves - <span>These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
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Veins are large blood vessels which carry blood back to the heart. <span>Veins have a system of valves to prevent back-flow.</span>
Red Blood Cells i believe are not part of the immune system. They carry oxygenated blood to the organs of the body
Answer:
sweat and vasodilation
Explanation:
Hyperthermia is when the body is too hot. (Not to be confused with hypothermia, when the body in too cold).
When we sweat, we are releasing moisture, like little bits of water, onto our skin. The water uses up heat energy from the body to evaporate. Because the body loses heat energy, it cools.
Vasodilation is when blood vessels widen. When this happens, the blood vessels are closer to the surface of the skin, allowing heat to escape through and exit the body.
Shivering and vasoconstriction would help to keep a person warm. Shivering makes the muscles on the body move, which increases heat. (Think of exercise, but on a small scale).
Vasoconstriction keeps blood vessels away from the surface of the skin.
