Question

Unstriped muscles are present in the.
A. Wall of intestine
B. Leg muscles
C. Muscles of the forelimb
D. Heart wall

Answer 1

Hint: Muscles can be defined as a soft tissue consisting of protein filaments that are made up of actin and myosin. The main purpose of muscles is to produce and control movement or locomotion and movement of internal organs.

Complete answer:
To answer this question, we must know the working and different types of cells. As we know that muscle tissues are derived from the mesodermal layer of germ cells. Muscles are fuelled by the oxidation of fats and carbohydrates but during fast use of muscle, anaerobic chemical reactions are also used. These reactions produce ATP molecules which produce energy needed.
There are three types of muscles in vertebrates, which are skeletal or voluntary muscles, cardiac muscles and smooth or involuntary or unstriped muscles.
Unstriped or smooth muscles are uncontrolled types of muscles that means they are not under conscious control. These types of muscles do not show any stripes or striated and have a smooth appearance and hence, also called as smooth muscles. They are arranged in the form of thin layers or sheets of spindle shaped, unstriated cells and have a single nuclei. They are found in the lining of the internal organs such as walls of the stomach, intestine and blood vessels. The unstriped muscles show characteristic slow and rhythmic contractions. It plays an important part in the regulation of flow in the organs such as it aids in the movement of food through the digestive system.
Hence, the option (A) Wall of the intestine is the correct option.
Leg muscles and muscles of the forelimbs are skeletal muscles and are voluntary in action as well as subjected to fatigue. The muscles of the heart are known as cardiac muscles and are involuntary in nature. Thus, according to the question,option A is the correct option.

Note: The unstriped muscles are involuntary muscles that are not controlled and are found in the linings of the internal organs. These muscles are smooth, single nucleated and capable of much slower rhythmic action.