To pick up something heavier than your pencil, your nervous system could
a. stimulate larger motor units
b. decrease the frequency of stimulation to allow a more prolonged contraction to occur
c. decrease the refractory periods
d. block acetylcholinesterase at the neuromuscular junction to allow acetylcholine to function longer
e. do all of the above
A
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If there was an increased concentration of K+ outside of the neuron, which would be TRUE?
A. The potassium equilibrium potential of nerve cells would become more negative. B. The sodium equilibrium potential would become less positive. C. Neurons would spontaneously hyperpolarize. D. During an action potential, the neuron would repolarize slowly or stay depolarized. E. Neurons would spontaneously depolarize.
Structure A on the skin diagram is the
A) epidermis.
B) dermis.
C) subcutaneous layer.
D) cutaneous membrane.
E) hypodermis.
What effect would a decrease in pH have on the amount of potassium ion in the urine?
A) an increase in the amount of potassium in the urine B) no effect on the amount of potassium in the urine C) a decrease in the amount of potassium in the urine
The quill or central part of a contour feather is known as what?
A) shaft B) spur C) mantle D) molt