Which of the following drugs would be the best choice to use in chronic asthma to dilate the bronchioles?
A. a nicotinic agent
B. a muscarinic agent
C. alpha-adrenergic blocking agents
D. beta-adrenergic stimulating agents
E. ganglionic blocking agents.
D
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Voltage-gated sodium channels can exist in how many different conformations?
a. one b. two c. three d. four e. five
During spermatogenesis, ________ is required for ________
a. FSH; spermatid remodeling b. LH; spermatid remodeling c. testosterone; for both mitosis and meiosis in the germ cells d. Both a and c e. Both b and c.
The Hering-Breuer inflation reflex is important in regulating the forced ventilations that accompany strenuous exercise. This reflex is initiated by __________.
a. olfactory receptor stimulation along the airway b. stretch receptor stimulation located in the smooth muscle of bronchioles c. chemoreceptor stimulation in the aorta and carotid arteries d. baroreceptor stimulation in the aorta and carotid arteries
Explain the decreased fertility commonly found in males with anabolic steroids use.
A. Exogenous testosterone will trigger a decrease in GnRH. B. Positive feedback will occur as a result of exogenous testosterone, leading to reduced sperm production. C. LH and FSH levels will increase in response to the exogenous testosterone. D. The adrenal cortex will increase production of endogenous testosterone, therefore decreasing sperm production.