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The impulse over a motor neuron will lead to
a. an interneuron.
b. the spinal cord.
c. a receptor.
d. an effector.
Introduction: Motor control can be defined as the systematic control of movement in organisms which contain a nervous system. The primary motor cortex (M1) is the main area of the brain that is involved in the motor function. M1 is present in the frontal lobe of the brain.
Answer to Problem 1PL
Correct answer:
The correct answer is the option (d). Effector.
Explanation of Solution
Explanation/justification for the correct answer:
Option (d). Effector. A motor neuron cell body is present in the motor cortex, brainstem or the spinal cord. Its axon or fiber projects to the spinal cord or its outside. A motor neuron can directly or indirectly control the effector organs, chiefly the glands and muscles. A nerve cell is (motor neuron) which transmits the impulses from the central nervous system to effectors in order to cause a physiological response to the modifications in the environment. Hence, the option (d) is correct.
Explanation for the incorrect answer:
Option (a) An interneuron. It is a neuron that transmits the impulses between other neurons, particularly as a part of a reflex arc. Hence, the option (a) is incorrect.
Option (b) The spinal cord. The spinal cord can be defined as the cylindrical bundle of the nerve fibers and connected tissue. It is surrounded in the spinal region and joins approximately all the body parts to the brain. It forms the central nervous system with the brain. Hence, the option (b) is incorrect.
Option (c) A receptor. A receptor is a protein that binds to a definite molecule known as ligand. A ligand might be a molecule such as hormones, inorganic minerals, proteins, and neurotransmitters. The ligand bound to the ligand-binding spot on the receptor protein. Hence, the option (c) is incorrect.
A nerve cell is (motor neuron) which transmits the impulses from the central nervous system to effectors in order to cause a physiological response to the modifications in the environment. Hence, the option (d) is correct.
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Laboratory Manual For Human Anatomy & Physiology
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