Upgrade to remove ads
Ch. 21 - Blood Vessels and Circulation
Terms in this set (18)
As blood circulates from arteries into capillaries, the total cross-sectional area of capillaries
A. is the same as the total cross-sectional area of arteries and blood velocity is equal between arteries and capillaries.
B. decreases and causes the blood velocity to increase.
C. increases and causes the blood velocity to increase.
D. decreases and causes the blood velocity to decrease.
E. increases and causes the blood velocity to decrease.
The layer of vascular tissue that consists of an endothelial lining and an underlying layer of connective tissue dominated by elastic fibers is the _____.
When chemoreceptors in blood vessels detect high levels of hydrogen ions in the blood, they stimulate all of the following changes EXCEPT
A. decreased stimulation of the cardioinhibitory center.
B. stimulation of the cardioacceleratory centers.
C. decreased respiratory rate.
D. increased venoconstriction.
E. increased total peripheral resistance.
In the bone marrow, new blood cells must enter the circulation through _________.
Sinusoid also capillaries.
The effective pressure across the capillaries is roughly ____.
17 mm Hg.
Which of the following would be a normal response of the cardiovascular system to an increased frequency of action potentials arising from the baroreceptors?
A. increased stroke volume
B. increased cardiac output
C. increased total peripheral resistance
D. increased stimulation of cardioinhibitory center
E. increased heart rate
The mechanism that helps maintain blood flow along the arterial network while the left ventricle is in diastole is called ____.
Each of the following will cause an increase in blood pressure except
A. increased levels of angiotensin II.
B. increased levels of antidiuretic hormone.
C. increased levels of aldosterone.
D. increased blood volume.
E. increased levels of natriuretic peptides.
Venous blood pressure is so low that several adaptations ensure blood flow returns to the heart. Factors that assist the low venous pressure in propelling blood toward the heart are
A. respiratory pump
B. venous valves
C. veins with large luminal diameters
D. skeletal muscle pump
E. All are factors that assist blood flow back to the heart.
Which of the following would cause relaxation of precapillary sphincters?
A. thromboxane A2
B. carbon dioxide
C. sympathetic activity
E. parasympathetic activity
Total peripheral resistance is affected primarily by ____.
Given the following information, calculate the net filtration pressure and indicate if the situation will promote filtration or reabsorption.
CHP = 45 mm Hg
IHP = 5 mm Hg
BCOP = 25 mm Hg
ICOP = 10 mm Hg
A. 15 mm Hg; filtration
B. -15 mm Hg; reabsorption
C. 25 mm Hg; filtration
D. 85 mm Hg; filtration
E. -25 mm Hg; reabsorption
F. 85 mm Hg; reabsorption
What is the mean arterial pressure for a person with blood pressure reading 110/65?
80 mm Hg
Which of the following conviction is least likely to lead to renin release?
A. renal artery thrombus (blood clot)
C. circulatory shock
D. hypoxia of kidney tissues
E. increased sympathetic stimulation
The difference between the systolic and diastolic pressure is called the ____ pressure.
Which of these is not a short-term response to a decrease in blood pressure?
A. peripheral vasoconstriction
B. increase in ventricular contractility
C. increase in heart rate
D. release of epinephrine and norepinephrine
E. constriction of elastic arteries to maintain blood pressure
During hemorrhaging, the drop in hydrostatic pressure will ____ filtration, thus ____ reabsorption.
In general terms, blood flow (F) is directly proportional to
B. total peripheral resistance.
C. increased viscosity.
OTHER SETS BY THIS CREATOR
12 main meridians
OTHER QUIZLET SETS
Imaging Equipment Exam 1
Module 5 Gastrointestinal Exam
NCCAOM Boards: Biomedicine