Muscles that act as synergists seem to have valuable functions, especially in stabilizing joints. Briefly explain their function.
What will be an ideal response?
Synergists aid agonists by promoting the same movement or by reducing undesirable or unnecessary movements that might occur as the prime mover contracts.
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If a fair-skinned person is sunburned, why does his or her skin turn red?
A) The blood supply to the skin decreases.
B) The number of red melanocytes in the skin increases.
C) The blood flow to the skin increases.
D) Increased heat causes the skin to turn red.
E) Melanocytes increase production of red pigments.
Second messengers generated by the actions of phospholipase C ________.
A. are inhibited by the actions of caffeine B. are stimulated by phosphodiesterases C. stimulate gene transcription D. may activate calmodulin
Which of the following parts of the spermatic cord is responsible for the maintenance of correct scrotal temperature for normal sperm production?
a. Ductus deferens b. Scrotal septum c. Vestibular spermatic muscle d. Cremaster muscle
The bundle of His is located here.
A. Interatrial septum B. Interventricular septum C. Floor of the right atrium D. Apex of the heart