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Cross-sectional Anatomy of Spinal Cord: Gray Matter Description

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Questions and Answers

Which part of the nervous system responds to stimuli from the external or internal environment?

Efferent Division
Motor Neurons
Afferent Division (correct)
Interneurons

What is the term for the process by which a stimulus is converted into an electrical signal in a sensory receptor?

Signal conversion
Permeability alteration
Neurotransmission
Receptor potential (correct)

How is stimulus intensity (strength) distinguished in the coding of sensory stimuli?

By the size of the effector response
By the frequency of action potentials generated (correct)
By the color of the stimulus
By the temperature of the stimulus

What causes the opening of voltage-gated Na+ channels leading to an action potential?

Stronger stimulus triggering larger receptor potential (D) Signup and view all the answers

What is the role of interneurons in the activation of motor neurons?

Stimulate motor neurons that carry action potentials to periphery (A) Signup and view all the answers

Which of the following is NOT a function of the dorsal horns of the gray matter in the spinal cord?

Transmitting efferent motor signals to skeletal muscles (B) Signup and view all the answers

Which of the following statements about the lateral horns of the gray matter is INCORRECT?

They are found throughout the entire length of the spinal cord (B) Signup and view all the answers

Which of the following statements about the white matter of the spinal cord is CORRECT?

It is grouped into three columns on each side of the spinal cord (B) Signup and view all the answers

Which of the following statements about the ascending tracts in the spinal cord is INCORRECT?

They relay messages from the brain to the spinal cord (C) Signup and view all the answers

Which of the following is NOT a component of a reflex arc?

Effector organ (muscle or gland) (A) Signup and view all the answers

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