Answer :
Final answer:
During arm wrestling, muscle contractions occur in both the biceps brachii and triceps brachii muscles. The biceps brachii muscle is responsible for flexing the elbow joint and generating force. When this muscle is stretched during arm wrestling, a stretch reflex is triggered, causing the muscle to contract and maintain stability.
Explanation:
a. During arm wrestling, muscle contractions occur to provide the force needed to move the arm and resist the opponent's force. These contractions involve the activation of both the biceps brachii muscle and the triceps brachii muscle in the arm.
b. The biceps brachii muscle plays a significant role in arm wrestling as it is responsible for flexing the elbow joint. It contracts to pull the forearm towards the upper arm, generating the force required to overcome the opponent.
c. When the biceps brachii muscle is stretched during arm wrestling, a **stretch reflex** is triggered. This reflex involves the activation of sensory receptors called muscle spindles, which detect the degree of stretch in the muscle. The muscle spindles send signals to the spinal cord, which in turn causes the biceps brachii muscle to contract, resisting the stretching and helping maintain stability.
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