Quiz 13: The Cardiovascular System: Blood Vessels and Circulation

Biology

The five general classes of blood vessels are: 1. arteries 2. arterioles 3. capillaries 4. venules 5. veins The arteries are responsible for delivering blood to the body organs, branching off into smaller arterioles. The arterioles supply blood to the capillaries, which are tiny, highly extensive vessels that permit exchange between blood and surrounding interstitial fluid. The veins return blood to the heart and are further classified into small venules.

Diastolic pressure refers to the minimum blood pressure at the conclusion of ventricular diastole. Diastolic pressure is recorded as the lowest blood pressure of the body nearing the second phase of diastole in the ventricles. The pressure in arteries rises during ventricular systole, or contraction, and falls during ventricular diastole, or relaxation. Thus, diastolic pressure describes the opposite of systolic pressure, and is lower in value. Thus, the correct answer is d

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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