Question

Which of the following is an involuntary muscle?
(a) Smooth muscle
(b) Cardiac muscle
(c) Striated muscle
(d) Both A and B

Answer 1

Hint: Striated muscles or skeletal muscles make up the parts of our body which contributes to locomotion and movement. The smooth muscles make the wall of the vessels and visceral organs of our body whereas the cardiac ones are the constituent muscle cell of the heart.

Complete step by step answer:
Both smooth and cardiac muscles are involuntary in nature. Only Striated ones we can control on our own. Striated muscles are present in the area of the body which we use for locomotion and movement. The other two are inside our body i.e. the smooth or visceral muscle consists of the wall of the visceral organs and the cardiac muscle makes the heart.

Additional Information: Let us know more about each kind of muscle and their importance:
Striated muscle: These are made of sarcomeres and are found in our movable parts and helps in locomotion. It is called striated due to the presence of stripes along its length. The cardiac muscle is also a type of it but in the question, it is meant for the skeletal voluntary muscles. Sarcomeres are the units of this muscle and this type of muscle contains sarcolemma (the cell membrane of the fiber cells), sarcoplasm (cytoplasm), and sarcoplasmic reticulum (endoplasmic reticulum of muscle cells). These muscles carry out the movement of our body by its contraction. We can control their movement with the help of the neural system.
Smooth muscle: Unlike the striated muscles, this one doesn't show any stripes. These are made of fibers of actin and myosin and used to apply pressure on the vessels and visceral organs. But the movement of these muscles is controlled by the somatic nervous system therefore called involuntarily.
Cardiac muscle: It is also striated but involuntary. They make the heart which pumps blood in our body our whole life. If it stops, we can't live. The continuous process of pumping is the result of continuous and rhythmic contraction and relaxation of cardiac muscles.
Therefore, the correct answer is both A and B.

Note: Muscles are responsible for most of the external and internal movements occurring in our bodies. From posture, locomotion to blood pumping all is a result of the activities of different muscles. These are made of protein filaments of actin and myosin and the contraction is a result of the fibers sliding past one another. All muscle tissues are derived from the mesodermal germ layer. Here are the 3 types of muscles: