Question

The spindle-shaped, uninucleate, unbranched and involuntary cells are present in
(a) Striated muscle
(b) Smooth muscle
(c) Cardiac muscle
(d) Both a and b

Answer 1

Hint:The spindle-shaped, uninucleate, unbranched and involuntary cells are characteristic features of smooth muscle. There are three types of muscles in the body such as: Smooth muscle, Skeletal muscle and Cardiac muscle with its specific characteristics respectively. The above mentioned characteristic features correspond to smooth muscle.

Complete answer:There are four types of animal tissues in the body: Epithelial tissues, Connective tissues, muscular tissues and neuronal tissues.
The muscle fibers consist of various types of muscle cells that play a vital role in contraction and help in movement of the body parts. The muscle tissues are of three types:
Skeletal muscle, smooth muscle and cardiac muscle with its specific attributes.
Characteristic Smooth muscles are those cells with spindle-shaped cells with a single nucleus. They are called smooth muscles as no striations are visible like striated muscles. and are involuntary in action. Smooth muscles contract slowly and rhythmically.
They are controlled by an autonomic nervous system. Peristalsis occurs by means of smooth muscle contraction. Other examples of smooth muscles are as follows:
Examples: Iris of the eye, blood vessels, bronchi of lungs, gastrointestinal tract, uterus and bladder.

So the correct answer is ‘Smooth muscle’

Note:Similar to smooth muscle cells, cardiac muscles are also uninucleated and involuntary, but cylindrical and branched. Intercalated discs are special attributes of cardiac muscles. In contrast to smooth muscles, striated muscles are cylindrical, unbranched, multinucleate and voluntary.