An example of unstriated muscles which are entirely involuntary is located in which of the following?

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In diaphragm

In eyelids

In pylorus

At the base of the external ear.

answer is C.

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Detailed Solution

concept - Striated muscles are found in the walls of hollow organs, including the stomach, intestines, bladder, and uterus, and the walls of passages such as the arteries and veins of the circulatory system and respiratory, urinary, and reproductive systems.
Let us discuss the choices given within the question.
1) Diaphragm- The diaphragm is created from thin striated muscle which is found at the bottom of the abdomen.
2) Eyelids- Eyelids are thin folds of skin which protect the eyes. The muscle present within the eyelid is levator palpebrae superioris which helps in opening and shutting of eyelids. The movement of this muscle may be both voluntary and involuntary.
3) Pylorus- The pylorus is a part of the stomach which connects to the duodenum. It consists of anatomical sphincter muscle which is present at the lower end of the stomach. it's involuntary in nature and is created by unstriated muscles.
4) External ear- There are two muscles present within the external organ which is the function of protecting the centre and sensory receptor. These muscles are voluntary in nature. Hence, the proper answer is option ‘3’.
Involuntary movements are the movement in our body which isn't under our control. These movements are felt in most parts of our body. An example of involuntary movement is reflex, movement of eyelids etc.
Hence, the correct answer is 3.

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