Question

1. A traffic policeman stretches out his arm to right. During this movement
(a) which of the muscle contracts ?
(b) which of the muscle stretches (or relaxes)?​

Answer 1

Answer:

a. Arms muscles

b. Arm

Explanation:

Answer 2

Answer:

Firstlty the deltoid and rotator cuff muscles contract when the traffic policeman stretches out his arm to the right.

Moreover the muscles on the opposite side of the arm, such as the chest, back, and shoulder blade muscles, stretch to allow the arm to move away from the body.

Explanation:

(a) When the traffic policeman stretches out his arm to the right, the muscles that contract are primarily the deltoid muscle, which is responsible for abducting the arm, and the rotator cuff muscles, which help to stabilize the shoulder joint.

(b) The muscles that stretch or relax during this movement are primarily the muscles on the opposite side of the arm, such as the muscles of the chest, back, and shoulder blade, which are lengthening to allow the arm to move away from the body. The muscles on the same side of the arm, such as the biceps and triceps, may also be involved in stabilizing the elbow joint during the movement, but they are not actively stretching or relaxing in the same way as the muscles on the opposite side of the arm.

Learn more about contraction of muscles: https://brainly.in/question/8511025

Learn more about joints: https://brainly.in/question/49377071

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