My last 4 questions that I am unsure of, Help?
#1. The cerebrum of the brain is considered as "gray matter" because the cells are lacking myelin sheath. It is assumed that brain cells cannot regenerate because of which characteristic of axons?
A. Axons of the central nervous are surrounded by a neurilemma.
B. Axons of the central nervous system lack a neurilemma.
C. Axons of the peripheral nervous system are surrounded by a neurilemma.
D. Axons of the peripheral nervous system lack a neurilemma.
#2. A stroke has caused damage to certain areas of the brain. Upon examination, a doctor notices that the person has difficulty understanding speech and the left side of the body is paralyzed. Identify the specific areas of the brain that are damaged, and explain how this damage might cause problems?
#3. Dopamine and serotonin are neurotransmitters produced by certain neurons in the brain. One effect of dopamine is that it brings about feelings of euphoria (pleasure). Serotonin affects the control of moods in a person. After being secreted into the synapse, dopamine is reabsorbed by transmitting neurons.
The illegal drug cocaine causes an overspill of dopamine from transmitting neurons and blocks the reabsorption of dopamine by these neurons. After the dopamine is released, cocaine slowly breaks down into inactive substances.
What is the general mood of an individual under the influence of cocaine? Does cocaine increase the speed of nerve transmission in the brain or remain longer than normal in the synapse? What effect does this have
#4. Factors that Could Affect Neuromuscular Junctions
I. Increase in the production of adrenaline
II. Inhibition of cholinesterase synthesis
III. Inhibition of acetylcholine release
IV. Blockage of receptor sites for acetylcholine in the muscle
Identify all the factors that would cause muscles used in breathing to lose their ability to function
A. II, III, IV
B. I and II
C. II and III
D. I, II, IV
Thanks!
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