Cardiovascular System Multiple Choice

30) Histologically, the ________ is squamous epithelium supported by a sparse connective tissue layer. A) tunica intima B) tunica media C) tunica externa D) tunica adventitia

: A

4) Which tunic of an artery contains endothelium? A) tunica intima B) tunica media C) tunica externa D) basement membrane

: A

17) Blood flow to the skin ________. A) is controlled mainly by decreasing pH B) increases when environmental temperature rises C) increases when body temperature drops so that the skin does not freeze D) is not an important source of nutrients and oxygen for skin cells

: B

20) Which tunic of an artery is most responsible for maintaining blood pressure and continuous blood circulation? A) tunica intima B) tunica media C) tunica externa D) basement membrane

: B

3) Which statement best describes arteries? A) All carry oxygenated blood to the heart. B) All carry blood away from the heart. C) All contain valves to prevent the backflow of blood. D) Only large arteries are lined with endothelium.

: B

45) Where in the body would you find low oxygen levels causing vasoconstriction and high levels causing vasodilation? A) kidney B) lungs C) liver D) heart

: B

46) Normal average blood pressure for a newborn baby is ________. A) 120/80 B) 90/55 C) 150/90 D) 130/80

: B

9) The pulse pressure is ________. A) systolic pressure plus diastolic pressure B) systolic pressure minus diastolic pressure C) systolic pressure divided by diastolic pressure D) diastolic pressure plus 1/3 (systolic pressure plus diastolic pressure)

: B

1) Which of the following is not one of the three main factors influencing blood pressure? A) cardiac output B) peripheral resistance C) emotional state D) blood volume

: C

11) Which of the following is likely during vigorous exercise? A) Blood will be diverted to the digestive organs. B) The skin will be cold and clammy. C) Capillaries of the active muscles will be engorged with blood. D) Blood flow to the kidneys increases.

: C

31) The arteries that directly feed into the capillary beds are called ________. A) muscular arteries B) elastic arteries C) arterioles D) venules

: C

35) Which of the following blood pressure readings would be indicative of hypertension? A) 120/80 in a 30-year-old man B) 140/90 in a 70-year-old woman C) 170/96 in a 50-year-old man D) 110/60 in a 20-year-old woman

: C

47) If blood pressure is almost normal in a person who has lost blood, does that mean the tissues are receiving adequate blood flow? A) yes B) no C) not necessarily

: C

27) Which of the choices below does not involve tissue perfusion? A) delivery of oxygen and nutrients to, and removal of wastes from, tissue cells B) gas exchange in the lungs C) absorption of nutrients from the digestive tract D) blood clotting

: D

36) Select the correct statement about factors that influence blood pressure. A) An increase in cardiac output corresponds to a decrease in blood pressure, due to the increased delivery. B) Systemic vasodilation would increase blood pressure, due to diversion of blood to essential areas. C) Excess protein production would decrease blood pressure. D) Excess red cell production would cause a blood pressure increase

: D

5) Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary function of ________. A) arterioles B) arteries C) veins D) capillaries

: D