MCAT Biology : Somatic and Autonomic Divisions

Study concepts, example questions & explanations for MCAT Biology

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Example Questions

Example Question #124 : Nervous System And Nervous Tissue

Efferent neurons carry information in what direction?

Possible Answers:

From the peripheral nervous system (PNS) to the central nervous system (CNS)

From the central nervous system (CNS) to the peripheral nervous system (PNS)

From the central nervous system (CNS) to afferent neurons

From the brain to the spinal cord

From afferent neurons to the central nervous system (CNS)

Correct answer:

From the central nervous system (CNS) to the peripheral nervous system (PNS)

Explanation:

Efferent neurons carry information from the central nervous system (CNS) to the peripheral nervous system (PNS). Afferent neurons carry information from the peripheral nervous system to the central nervous system.

In general, afferet neurons will relay sensory information about the environment (both internal and external), carrying these signals from the periphery to the central nervous system for integration and interpretation in the brain. Efferent neurons, in contrast, will carry motor signals or other internal stimuli to respond to the sensory information provided.

Example Question #125 : Nervous System And Nervous Tissue

The amygdala is located in which part of the brain?

Possible Answers:

Temporal lobe

Cerebellum

Corpus collosum

Brain stem

Correct answer:

Temporal lobe

Explanation:

The amygdala is responsible for emotional memory and is part of the limbic system, which is located in the temporal lobe.

Example Question #126 : Nervous System And Nervous Tissue

Under which division of the nervous system does the "fight or flight" impulse originate?

Possible Answers:

Sensory division

Central nervous system

Somatic division

Autonomic division

Parasympathetic division

Correct answer:

Autonomic division

Explanation:

The nervous system is divided into the central nervous system (brain and spinal cord) and peripheral nervous system (all other nerves). The peripheral nervous system is then divided into the sensory and motor divisions. Then, the motor division is further divided into the somatic and autonomic divisions. The autonomic division is then divided into the parasympathetic ("rest and digest") and sympathetic ("fight or flight") divisions.

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