Why does an action potential travel in one direction down an axon?
A. because it needs to reach the synapse to
trigger release of neurotransmitter
B. because voltage-gated sodium channels
cannot immediately reopen
C. because voltage-gated potassium
channels remain open longer
D. because the diffusion of charge can only
occur in one direction
B
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The reason humans inhale oxygen is so that it can be used for:
What will be an ideal response?
Based on their response to a particular hormone from
the anterior pituitary, Sertoli cells of the male are most like __________ of the female. a. uterine cells b. oviducts c. ovarian follicles d. cervix cells e. the corpus luteum
If the frequency of PKU, an autosomal recessive disease, is 1% in males, what is the frequency of females with PKU? (You may assume that the population is in Hardy-Weinberg equilibrium.)
What will be an ideal response?
The transfer of pollen from the male reproductive structure to the female reproductive structure is called
A. ovulation. B. implantation. C. pollination. D. photosynthesis.