1) True or False: blood volumes can be reduced in closed circulatory systems com
ID: 3477052 • Letter: 1
Question
1) True or False: blood volumes can be reduced in closed circulatory systems compared to open circulatory systems
2) True or False: blood can be directed to specific tissues in closed systems
3) Which circuit has higher MAP? Why?
a. systemic circuit, because the length of circuit vessels is greater than in pulmonary circuit
b. systemic circuit, because the resistance to blood flow is greater
c. pulmonary circuit because the diameter of pulmonary arteries/arterioles is greater than systemic vessels
d. pulmonary circuit to assure there is sufficient MAP for blood to reach lungs
e. both a and b
4)What problem does the drop in systemic blood pressure create?
a. There may be too much blood pressure entering the capillaries
b. There may not be enough pressure for blood to return from legs and torso to the heart
c. The pressure gradient between vena cava and R atrium may be too small
d. There may not be enough pressure to pump blood to head
e. b and d
Explanation / Answer
1. True, blood volume is reduced in closed circulatory system because it doesnt have to flood the tissues and can work effciently with lower volume of blood as comapred to open circulatory system, which is sluggish, and require large volume to flood through spaces.
2. True, blood can be directed to a specific tissue or organs in closed circulatory system via vessels and capillaries.
3. b. systemic circuit, because the resistance to blood flow is greater (the resistance of blood flow in systemic circuit is 7 times greater than pulmonary circuit)
4. e. low blood pressure, creates dizziness and headache because there is not enough pressure to pump the blood to the head. also the pressure is too low to return the blood from legs and torso to the heart, this kind of low blood pressure is also known as orthostatic hypotension, it is more apparent when stannding up from siting position or lying down.
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