Which of the following is NOT true concerning an electrical synapse?
A) Connexons carry ions between the two communicating cells.
B) Information travels in one direction only.
C) This type of synapse is characteristic of cardiac muscle.
D) Information transfer does not involve the release of neurotransmitters.
Answer: B) Information travels in one direction only.
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Increased activity of phosphodiesterase in a target cell would decrease its level of
A) testosterone. B) estrogen. C) thyroid hormone. D) cAMP. E) progesterone.
________ is explained by chemical and physical principles and is concerned with the function of specific organs or organic systems
Fill in the blank with correct words.
Which cranial nerve innervates the superior oblique muscle?
A. The oculomotor nerve B. The abducens nerve C. The trigeminal nerve D. The trochlear nerve E. The glossopharyngeal nerve
In a relaxed muscle fiber, what blocks the active sites on actin?
A. Tropomyosin B. Myosin heads C. Troponin D. Elastic fibers E. Calcium ions