Question

Describe how the following would change if you were to extend your arm at the elbow (that is, stretch the biceps).

Answer 1

Answer:

a. The biceps would relax causing it to increase in length

b. The firing of the muscle-spindle afferents from the biceps would decrease.

c. The alpha motor neurons would contract or decrease.

Explanation:

The skeletal joints in the human or animal body are controlled by muscles. Examples of these muscles are the biceps and triceps found in the human arm. They control the elbow joint with the biceps in front and triceps at the back of the elbow.

When the arm is extended from the elbow, the biceps relaxes or extends while the triceps contracts. This increases the length of the biceps and reduces the triceps length.