Select the answer that correctly orders the events that occur when a nerve signal reaches the synaptic knob.
(1) The neurotransmitters bind to receptors on the postsynaptic cell.
(2) The postsynaptic cell is stimulated to initiate a nerve signal.
(3) Synaptic vesicles release neurotransmitters via exocytosis.
(4) Neurotransmitters diffuse across synaptic cleft.
A. 1, 2, 3, 4
B. 2, 3, 1, 4
C. 4, 3, 1, 2
D. 3, 4, 1, 2
E. 2, 3, 4, 1
D. 3, 4, 1, 2
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Progenitor cells form
A) all the different types of blood cells. B) stem cells. C) hematopoietic stem cells. D) only specific types of blood cells. E) None of the answers are correct.
Which gland is located in the sella turcica?
A. thymus B. adrenal C. pineal D. hypothalamus E. pituitary (hypophysis)
The ECG T wave interval represents ________.
Fill in the blank(s) with the appropriate word(s).
Receptors are parts of the nervous system that allow it to
A. collect information. B. initiate responses to information. C. conduct impulses to muscles. D. process information.