Question

The tissue which functions throughout life continuously without fatigue is
A. Smooth muscle
B. Voluntary muscle
C. Skeletal muscle
D. Cardiac muscle

Answer 1

Hint: Our body is made up of various tissues and muscles. They make the framework of the body. They hold the body in one piece and help it to coordinate our locomotion and balance. Maintaining posture and movements is required for concentrating on our work.

Complete answer:
Muscle is a soft tissue in the body which contracts. They can alter the shape and length of a cell. They have actin and myosin filaments. There are mainly three types of muscles – cardiac, smooth and skeletal.

Option A: Smooth muscle: These are muscles which help to apply pressure on vessels. They have smooth muscle cells. They have actin and myosin fibres.

Option B: Voluntary muscle: They are the muscles which work on our wish. We can make them work. They are attached to bones. They help in locomotion.

Option C: Skeletal muscle: They are found in bones. They connect the outer coverings of bones via tendons. They help in movements and maintain posture/balance.

Option D: Cardiac muscle: Heart muscles are called cardiac muscles. They beat throughout life without getting tired. They work automatically and constantly. They contract and relax to pump blood continuously.

So the answer is option D: Cardiac muscle.

Note:
Cardiac muscle makes up the maximum of heart tissue. It is only found in the heart. They are part of the involuntary muscle system. The pacemaker is the specialized cell which controls its movements. Contractions of the heart are specifically controlled by the pacemaker. It is made of cardiomyocytes connected by collagen fibres and intercalated discs.