-a total of 64% of blood is in the veins, venues, and venous sinuses; 7% in the arterioles
and capillaries; 13% in the arteries; 7% in the heart; and 9% in pulmonary circulation
Which physiologic mechanism helps ensure venous return despite low pressure in the
venues?
-cardiac muscle relaxation
-vasodilation in the periphery
-positive pressure in the right atrium
-negative pressure in the right atrium - Answer✔️✔️--negative pressure in the right atrium
the three mechanism that help ensure venous return are negative pressure in the right
atrium, constriction of veins, and the combination of venous valves and contraction of
skeletal muscles.
In the failing heart, arterial pressure falls, stimulating the baroreceptor reflex to increase
sympathetic nervous system activity. Which finding is an expected outcome of
increased sympathetic activity?
A. Tachycardia
B. Bradypnea
C. Hypotension
D. Hypoglycemia - Answer✔️✔️-A. Tachycardia
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