One example of a simple reflex arc involves the
A)contraction of a muscle when it is stretched.
B)conscious message to move part of the body.
C)receptor, the brain, and the effector.
D)muscle action in a salute when a noncommissioned combatant sees an officer.
E)contraction of an antagonistic muscle when its opposite muscle relaxes.

Question

Quizplus · Accepted Answer

A simple reflex arc involves only three elements: a sensory receptor that detects a stimulus, a motor neuron that sends a message from the spinal cord to the muscle, and an effector muscle that contracts in response to the stimulus. An example of this is the knee-jerk reflex, where the patellar tendon is tapped and the quadriceps muscle contracts to move the leg.

One Example of a Simple Reflex Arc Involves the