What are the main cells of the lymphatic system?
A) red blood cells
B) lymph nodes
C) macrophages
D) lymphocytes
D
Explanation:
A) Red blood cells are not the cells of the lymphatic system.
B) Lymph nodes are not cells.
C) Macrophages are not the main cells of the lymphatic system.
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A person warming up after being cold feels a warm rush as blood flows quickly to the peripheral appendages. Nitric oxide is important in this situation because it
A. raises blood temperature. B. raises blood pressure. C. relaxes the smooth muscle in the blood vessel wall. D. enhances gas exchange.
The carotid ________ are baroreceptors in carotid arteries that respond to changes in blood pressure.
Fill in the blank(s) with the appropriate word(s).
In which situation would the stroke volume be the greatest?
A) when venous return is decreased B) when venous return is increased C) when calcium channel blockers are present D) when the difference between the end-diastolic volume and the end-systolic volume is small E) when the force of contraction is decreased
The hormone erythropoietin is produced when ___________ levels in the plasma fall below normal
Fill in the blank(s) with correct word