Francisco has a disease that is destroying the myelin on his neurons. What effec

Question

Francisco has a disease that is destroying the myelin on his neurons. What effect will this disease most Francisco? a. His brain and spinal cord will completely cease to function. b. His will be paralyzed on one side of his body but not the other. c. His neural signals will slow down. d. His neural signals will speed up. Dr. Adelman is biological psychologist who is most interested in studying the part of the neuron that from other neurons. He is most likely to focus on which of the following? a. myelin b. axon bulbs c. dendrites d. glia The junction between adjoining neurons is called the _________. a synapse b. myelin sheath c. dendrite space d. cellular gap

Explanation / Answer

14.

Myelin is a fatty insulating envelop that cover the nerve fiber or axon and facilitate the transmission of nerve symbols. These disorders commonly known as demyelinating diseases. Main function of myelin includes increases the speed of impulses. It cannot cease the complete function of brain and spinal cord. Damage to myelin sheet slowing down the electrical signals along the neuron which leads to paralysis some times. The symptoms of damage to myelin includes following.

·         Blurred double vision

·         Fatigue

·         Clumsiness

·         Hand paralysis

·         Hemiparesis

·         Genital anaesthesia

·         Incoordination

·         Paraesthesia

So option (B) is the correct answer.

15.

A neuron that may have short branching projections are called dendrites. Dendrites receive information from axons of another neurons by the help of action potentials. It includes either excitatory or inhibitory signals. Dendrites responses to both the sensory system and neurotransmitters.

So option (C) is the correct answer.

16.

Presynaptic and postsynaptic neurons communicate with one another at the junction is called synopsis.

At the synapse one neuron sends a message to another neurons. Most synopsis are chemical and some are electrical. Chemical synopsis communicate by the help of chemical messengers. Electrical synopsis communicate by the help of ion flow between the nerve cells.

So option (A) is the correct answer.

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