Aldosterone and ADH are both hormones that regulate the flow and volume of blood within the body. Both of these hormones promote fluid retention and reabsorption at the kidneys when there is a drop in blood pressure. This function prevents further loss of blood and promotes intake of fluid by stimulating thirst. As a result, ADH and aldosterone play a key role in regulating the body following hemorrhaging to restore the proper level of blood.
Vasoconstriction of the renal artery would promote an increase in systemic blood pressure and volume. Vasoconstriction leads to a loss of blood pressure to the kidney, since there is less space in the arteries to sustain blood flow. This triggers the release of the enzyme renin. Renin causes the release of angiotensin II, which is a hormone that stimulates cardiac output and elevates systemic blood pressure.
A cross-section of tissue with small, thin-walled vessels with little smooth muscle tissue would show veins. Veins have thin walls, as they do not accumulate much pressure. The tunica media of an artery has more smooth muscle tissue than that of a vein. Thus, these blood vessels must be veins, as arteries tend to have thicker walls and more smooth muscle tissue than veins to support their function.
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