Which of the following vitamins aids in absorption of calcium and phosphorus from the intestinal tract?
A. Vitamin A
B. Vitamin B
C. Vitamin C
D. Vitamin D
Answer: D
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In some cultures, infant boys are circumcised. Explain what circumcision is and why there is support for as well as opposition to the procedure.
What will be an ideal response?
In a neuromuscular junction, the effect of acetylcholine (ACh) binding to receptors on the motor end plate lasts only briefly due to
a) rapid uptake of the ACh into the myofiber. b) endocytosis of the ACh receptor into the myofiber. c) rapid destruction of ACh in the synaptic cleft by acetylcholinesterase. d) rapid destruction of ACh in the synaptic cleft by monoamine oxidase. e) diffusion of the ACh out of the synaptic cleft.
The ______ refines bodily movement and balance based on sensory inputs.
Fill in the blank(s) with the appropriate word(s)
Fertilization can only occur
A. when a sperm cell penetrates a secondary oocyte. B. when there is no menstrual flow. C. if orgasms occur in both the male and female. D. after oxytocin is released from the hypothalamus. E. on day 14 of the cycle.