Question

What happens when :
(a) your biceps muscle contracts ?
(b) your triceps muscle contracts ?​

Answer 1

Answer:

a) when our biceps contracts the triceps expands.

b) when our triceps contracts the biceps expands.

Answer 2

Answer:

Explanation:

(a)When your biceps muscle in your upper arm contracts, it pulls your lower arm in towards your shoulder. However, when it relaxes, your biceps cannot push your arm back out. To do this, your triceps muscle, on the underside of your upper arm, contracts and straightens your arm out.

(b) When you contract your triceps your arm straightens and the angle between the forearm and the upper arm increases.