Upregulation of a target cell can occur in response to
A) prolonged increase in the level of a hormone.
B) signals from antagonistic hormone products.
C) prolonged decrease in the level of a hormone.
D) signals from the posterior pituitary.
C
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Oxytocin ________.
A) release is an example of a positive feedback control mechanism B) is an adenohypophyseal secretion C) exerts its most important effects during menstruation D) controls milk production
The process of preventing micturition in spite of initiation of the reflex involves
a. the cerebral cortex. b. voluntary stimulation of the motor neuron supplying the external urethral sphincter. c. voluntary stimulation of the internal urethral sphincter via its parasympathetic nerve supply. d. both (a) and (b) above. e. all of these answers.
An abnormally low production of gonadotropin produces a condition called __________.
a. follitropism b. hypogonadism c. somatomedins d. diabetogenesis
The junction between an axon and the muscle fiber itself is called a ________ junction.
Fill in the blank(s) with the appropriate word(s).