Increased circulating concentrations of testosterone would cause decreased secretion of ________.
A. growth hormone
B. luteinizing hormone
C. thyroid stimulating hormone
D. adrenocorticotropin
Answer: B
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A patient goes to her doctor, complaining of fatigue, weight gain, and intolerance to cold. She also has a noticeable goiter in her neck. Which of the following is a most likely diagnosis and cause?
A. She has hyperthyroidism, possibly due to a hypersecreting tumor of the anterior pituitary gland. B. She has hypothyroidism, possibly due to low iodine in her diet. C. She has hypothyroidism, possibly due to destruction of thyrotrope cells of her anterior pituitary gland. D. She has hyperthyroidism, possibly due to Graves' disease.
When placed into water, the ionic compound NaCl will
A. decompose. B. bond more strongly to each other. C. dissociate into Na+ and Cl- ions. D. bond covalently with water molecules, forming HCl and NaOH.
Choose the answer that correctly lists, in chronological order, the events involved in synaptic transmission
a: A nerve impulse reaches the synaptic knob. b: Neurotransmitter molecules diffuse across the synaptic cleft. c: A nerve impulse begins in the postsynaptic cell. d: Neurotransmitter molecules bind to receptors in the postsynaptic cell. e: A voltage change occurs in the postsynaptic cell. A. a, c, b, d, e B. a, b, e, d, c C. c, b, d, e, a D. a, b, d, e, c E. c, a, b, d, e
Nicotinic receptors bind
A. acetylcholine and allow chloride ions to exit the cell. B. acetylcholine and allow sodium ions to enter the cell. C. muscarine and increase the contractility of intestinal muscle. D. norepinephrine and can either stimulate or inhibit the cell. E. norepinephrine and allow potassium entry, thereby exciting the cell.