passwella.
Menu

JAMB Biology 1995 Question 19

Question 19

Support and Movement

During the bending of the arm, the biceps muscle

  1. A.contracts and the triceps muscle relaxes
  2. B.relaxes and the triceps muscle contracts
  3. C.and the triceps muscle contract
  4. D.and the triceps muscle relax.
Show the answer and explanation

Answer: A (contracts and the triceps muscle relaxes)

Explanation

Biceps and triceps are an antagonistic pair: to bend the arm the biceps contracts while the triceps relaxes.