The most important factor in vascular resistance is (a) the viscosity of the blood, (b) the diameter of the lumen of blood vessels, (c) turbulence due to irregular surfaces of blood vessels, (d) the length of the blood vessels.

Why is blood flow to the brain relatively continuous and constant?

Compare the effects of the cardioacceleratory and cardioinhibitory centers on cardiac output and blood pressure.

Bob is sitting outside on a warm day and is sweating profusely. Mary wants to practice taking blood pressures, and he agrees to play the patient. Mary finds that Bob's blood pressure is elevated, even though he is resting and has lost fluid from sweating. (She reasons that fluid loss should lower blood volume and, thus, blood pressure.) Why is Bob's blood pressure high instead of low?

Blood is transported through the venous system by means of (a) skeletal muscle contractions, (b) decreasing blood pressure, (c) the respiratory pump, (d) a and c.

Which of the following conditions would have the greatest effect on peripheral resistance? (a) doubling the length of a vessel, (b) doubling the diameter of a vessel, (c) doubling the viscosity of the blood, (d) doubling the turbulence of the blood, (e) doubling the number of white cells in the blood.

How do pressure and resistance affect cardiac output and peripheral blood flow?

Multiple ChoiceMore than one choice may apply.Using the figure, determine which vessels have the most resistance. a. arteriesb. veinsc. capillariesd. arteriolese. venules

How does the control of blood flow to the skin for the purpose of regulating body temperature differ from the control of nutrient blood flow to skin cells?