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What process is described by an animal’s ability to involuntarily contract a skeletal muscle without receiving a direct signal from the brain?
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Correct Answer: B. Reflex Arc
A reflex arc is a nervous system process whereby the stimulus causes a motor movement that is coordinated by the spinal cord and not the brain. Sensory neurons are able to capture the environmental stimuli and send the afferent signal to the spinal cord, which is able to send an efferent (motor) signal directly to the effector, a muscle, which then moves. Plasticity refers to the brain’s ability to repair itself following damage. Metabolism is the general term defining the cell’s use and production of energy. Redirection is not an accurate term and is not used in biology. Depolarization is the process of changing the cell membrane’s to become more positive, commonly observed when in the nervous system with the propagation of an action potential. Therefore the correct answer is [B].
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