Sex hormones are produced only by the gonads.
Answer the following statement true (T) or false (F)
False
Sex hormones are also produced by the adrenal glands.
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A steroid hormone acts on a target cell by
A. causing a second messenger to be formed. B. causing the cell to divide. C. directly causing protein synthesis. D. promoting phagocytosis.
An action potential releases neurotransmitter from a neuron by opening which of the following channels?
A. Voltage-gated Na+ channels B. Voltage-gated K+ channels C. Voltage-gated Ca2+ channels D. Chemically gated Ca2+ channels
If there is an increase in extracellular K+ ion concentration, the result is
A) depolarization of the plasma membrane. B) hyperpolarization of the plasma membrane. C) little, if any, change in the resting membrane potential of the plasma membrane. D) all of the above
In the female menstrual cycle ________.
A. menstruation occurs during the last four days of the cycle B. ovulation is stimulated by decreasing concentrations of progesterone C. the luteal phase is characterized by high circulating concentrations of estrogens D. progesterone secretion is stimulated by LH