Papillary muscles prevent the AV valves from prolapsing (bulging) excessively into the atria when the ventricles contract.
Answer the following statement true (T) or false (F)
True
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Binding of hydrophilic hormones to their receptors often results in the formation of one or more second messengers that lead to alterations of the cell's activity.
Answer the following statement true (T) or false (F)
When a muscle contracts, it usually has an opposing muscle that can cause movement in the opposite direction. Such a muscle is called a(an)
A) prime mover B) agonist C) antagonist D) synergist
Intrinsic heart rate may be influenced or modified by ________.
A) either the SA node or the AV node only, but no other factors B) the autonomic nervous system C) the somatomotor cortex D) hormones secreted by the lungs E) enzymes released from the kidney
The hypothalamus regulates ___________.
A) heart rate B) body temperature C) water balance D) glandular secretions E) all of the above