Question

The triceps and biceps muscles are of:
A. Antagonist type
B. Involuntary type
C. Smooth type
D. Sphincter type

Answer 1

Hint: Biceps brachii and triceps are muscles that help to flex and extend the arm respectively.

Step by step answer:Biceps brachii is a skeletal muscle of the anterior compartment of the arm. It has two heads; the short head and the long head. Its main function is to flex the forearm (antebrachium) at the elbow joint. The triceps is also a skeletal muscle present in the posterior compartment of the arm. It has three heads; long head, medial head, and lateral head. Its main function is to extend the forearm(antebrachium) at the elbow joint
Flexion of the forearm is its inward and upward movement. Ex: Lifting dumbbells in the gym
The extension of the forearm is its backward and downward movement.
Flexion and extension are opposing actions, I.e., they occur in opposite directions and contract and relax during the respective movements.
Additional Information:
-Involuntary muscles are those muscles that are not under our conscious control, they are innervated by the autonomic nervous system (ANS). They include cardiac muscles (confined to the myocardium of the heart) and smooth muscles.
-Smooth muscles are muscles that are present in the walls of the viscera like the stomach, intestine, ureter, urinary bladder, uterus, etc.
-Sphincter muscles are those that are present in the sphincters of the body, they are usually the thickening of the inner circular layer of smooth muscles in the walls of the viscera.
-Skeletal muscles like the biceps and triceps are of voluntary type, they are under our conscious control. They are innervated by the somatic nervous system.

Note: Biceps brachii has two heads (a short head and a long head) while triceps have three heads (a long head, a medial head, and a lateral head). The biceps function is to flex the forearm at the elbow joint, on the other hand, the triceps function is to extend the forearm at the elbow joint.