The heart is called a double pump because ________
A) it is two separate side-by-side pumps serving different circulations
B) blood flows into the receiving chambers, which pump it to the muscular chambers that pump it again for distribution
C) every chamber has a strong pumping action
D) blood is sent from one pump that imparts a small pressure directly into a second pump that imparts higher pressure
Answer: A
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Decreased ability of the blood to carry oxygen may be due to a deficiency in ________.
A. iron B. copper C. zinc D. gold
Autorhythmicity in the heart is the responsibility of:
A) contractile cells. B) cardiac pacemaker cells. C) smooth muscle cells. D) skeletal muscle cells.
Smooth and cardiac muscles are under involuntary control.
Answer the following statement true (T) or false (F)
Any given protein contains binding sites for only one kind of ligand
Indicate whether the statement is true or false.