Which of the following evolutionary adaptations would result in an increase in the speed of conduction of action potentials by increasing the membrane resistance of the axon?
a. increasing the number of channels in the plasma membrane
b. myelinating the axon
c. increasing the diameter of the axon
d. placing all voltage-gated ion channels at distant intervals
e. decreasing the number of channels in the membrane.
B
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Cell death first occurs
A. at puberty. B. in the fetus. C. at age 60. D. at age 50.
The lining of the uterus is known as the __________
Fill in the blank with the correct word.
All of the synapses and neuroeffector synapses of the parasympathetic division of the ANS use the neurotransmitter ________.
Fill in the blank(s) with the appropriate word(s).
Which is correct about the contraction sequence of the heart?
A. The contraction and relaxation of all four chambers happen at the same time. B. The right atrium and ventricle contract at the same time, and as they are relaxing, the left atrium and left ventricle begin to contract. C. Contraction begins in the order: right atrium, then right ventricle, then left atrium, then left ventricle. D. The two atria contract at the same time, and as they are relaxing, the two ventricles contract together. E. The atria and ventricles begin their contractions at the exact same time, but the atrial contraction only lasts half as long as the ventricle contraction.