Select the last step for synaptic signaling when the action potential arrives at the axon terminal of a presynaptic neuron
a. A neurotransmitter is released by exocytosis.
b. Calcium flows in the synaptic knob.
c. The neurotransmitter combines with a protein receptor on the subsynaptic membrane.
d. The permeability is altered in a postsynaptic neuron.
e. Sodium influx occurs at the axon terminals
D
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Which correctly lists a function of estrogens in females and testosterone in males?
A. They stimulate the secretion of luteinizing hormone (LH). B. They stimulate the secretion of gonadotropin-releasing hormone (GnRH). C. They prevent the pubertal growth spurt. D. They are responsible for epiphyseal plate closure. E. They stimulate the reabsorption of bone.
The __________ cuff is a structure formed by the tendons of the subscapularis, supraspinatus, infraspinatus, and teres minor muscles.
Fill in the blank(s) with the appropriate word(s).
An ovulating oocyte is actually activated by hormones about ________ days before ovulation.
A) 14 B) 28 C) 85 D) 110
This figure shows the endocrine system. Which number indicates the thymus gland?
A. 1 B. 2 C. 3 D. 4 E. 6