Conductive activity in a neuron generally causes it to secrete
A. several types of neurotransmitters simultaneously, that all work to prevent another immediate impulse.
B. a specific neurotransmitter that always excites its target.
C. a specific neurotransmitter that either excites or inhibits its target.
D. several types of neurotransmitters simultaneously, all of which excite the cell's target.
E. several types of neurotransmitters simultaneously, that are broadcast to excite and inhibit multiple targets.
Answer: C
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David woke up late for work and did not have time to eat breakfast. He ate dinner at 6 pm the previous night and has not eaten since. What will be the response of David's hormones?
A. David's liver will release insulin to raise blood glucose levels. B. David's liver will release glucagon to raise blood glucose levels. C. David's pancreas will release glucagon to raise blood glucose levels. D. David's pancreas will release insulin to raise blood glucose levels.
Which of the following are released by damaged tissues and function as intercellular autocrine or paracrine signals?
A. Erythropoietin B. Prostaglandins C. Epinephrine D. Norepinephrine E. Aldosterone
Carbonic anhydrase
a. is found in the red blood cells. b. catalyzes the formation of carbonic acid from carbonic dioxide and water. c. catalyzes the formation of oxyhemoglobin from oxygen and reduced hemoglobin. d. both (a) and (b) above. e. both (a) and (c) above.
Which of the following is/are found only in the PNS?
A. Nerves B. Astrocytes C. Unmyelinated axons D. Myelin E. Lipofuscin