Which of the following statements regarding skeletal muscle is TRUE?
A. Skeletal muscle fibers have pacemaker activity.
B. Skeletal muscle fibers are joined together by gap junctions.
C. A given skeletal muscle fiber will contract when excitatory nervous stimuli sufficiently exceed inhibitory nervous stimuli at the motor end plate.
D. A given skeletal muscle fiber will contract if excitatory synaptic inputs sufficiently exceed inhibitory synaptic inputs on the motor neuron that innervates that fiber and the motor neuron fires an action potential.
E. Skeletal muscle contraction is inhibited by inhibitory motor neurons that synapse onto skeletal muscle fibers.
D
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Lysosomes contain enzymes that prepare the vesicles that will be used by the Golgi apparatus to package its secretory products.
Answer the following statement true (T) or false (F)
Aldosterone exerts effects on principal cells of the kidney by causing
A. increased levels of cAMP and increases in the total number of Na+ channels. B. decreased levels of cAMP and decreases in the number of open K+ channels. C. increased numbers of Na+/K+ pumps. D. decreased numbers of Na+/K+ pumps.
Each of the following is a means of generating or holding heat in the body except
a. diminished sweating b. exercising c. shivering d. vasodilation in the skin e. behavioral adaptations
Aquaporins may be employed during:
A) simple diffusion. B) endocytosis. C) active transport. D) osmosis.