Synergism occurs when
a. one hormone induces the loss of another hormone's receptors
b. the actions of several hormones are complementary, and their combined effect is greater than the sum of their separate effects
c. one hormone must be present in adequate amounts for the full exertion of another hormone's effect, even though the first hormone does not directly elicit the response
d. one hormone increases the number of target-tissue receptors for another hormone
e. the number of target tissue receptors for a hormone is reduced as a direct consequence of the hormone's effect on its own receptors
B
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Vitamin __________ promotes the cross-linking of collagen molecules in bone and other connective tissue.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements concerning olfaction is true?
A. Olfaction first goes to the thalamus and is then relayed to the cerebral cortex. B. Continued stimulation of olfactory neurons produces the same level of response. C. Olfactory epithelial receptors are highly specific. D. Replacement of neurons is a common phenomenon in the body. E. Damaged olfactory neurons are replaced.
Which of the following is NOT a factor that determines the rate of pulmonary and systemic gas exchange?
a) Partial pressure difference of gases b) surface are availability for gas exchange c) Diffusion distance d) Molecular weight and solubility of the gases e) All of these are factors that determine the rate of pulmonary and systemic gas exchange.
The movement of chromosomes during mitosis is due to ________.
spindle fibers telomeres chromatids actin and myosin