USU PHYSIOLOGY 2420 EXAM #3 UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

USU PHYSIOLOGY 2420 EXAM #3 UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS

Question:
1. _______ receptor proteins lack an integral ion channel.
Answer:
Metabolic

Question:
2. At an inhibitory GABA-ergic synapse, GABA receptors are _________ channels.
Answer:
Chloride

Question:
3. What mode of neurotransmission does a taste cell have (vesicular secretion, non-vesicular release or
retrograde release)? What neurotransmitter molecule is released by a taste cell II?
Answer:
Non-vesicular, ATP. (ATP does not need a vesicle)

Question:
4. List one molecule that is known to signal in a retrograde fashion.
Answer:
Endocannabinoids

Question:
5. What are the potential fates of neurotransmitters after they have entered a synaptic cleft?
Answer:
Diffusion, Degrade, Reabsorb.

Question:
6. What makes a neurotransmitter inhibitory or excitatory?
Answer:
Excitatory generates an action potential, inhibitory hyperpolarizes, which negates an action potential.

Question:
7. What important essential feature of the nervous system does the Black Reaction reveal? Who
discoveredthis?
Answer:
Nervous system is composed of individual and separate cells that have discreet endings. Cajal discovered
this.

Question:
8. The outer surface of the brain is bathed in a fluid known as __________
Answer:
Cerebral spinal fluid.

, Question:
9. The adult human brain receives about __________ % of cardiac output.
Answer:
15-20%

Question:
10. The number of neurons in the nervous system is estimated to be ___________________.
Answer:
1 trillion.

Question:
11. Neuroglia outnumber neurons by __________.
Answer:
10:1

Question:
12. Glia means "glue" which makes sense as they help bind ______________
Answer:
Neurons.

Question:
13. Name four different types of glial cells found within the CNS. Do you remember what they do?
Answer:
Oligodendrocytes, ependymal cells, microglia, and astrocytes.

Question:
14. Which type of glial cell in the brain forms myelination of axons?
Answer:
Oligodendrocytes.

Question:
15. Which type of glial cell in the brain lines the ventricles, and forms choroid plexes?
Answer:
Ependymal cells.

Question:
16. A ___________ neuron has a single process leading away from the soma. These types of neurons can
befound sending sensory information from the skin to the spinal cord.
Answer:
Unipolar

Question:
17. What is the difference between a nerve and a tract?
Answer:
Tracts are groupings of axons in the CNS, Nerves are in the PNS.