Question

Multi-unit smooth muscles are found in the wall of
A. Large Blood vessels
B. Intestine
C. Stomach
D. Urinary Bladder

Answer 1

Hint: In order to answer the above question, we should know the structure of all the given human body organs and the types of muscles found in the human body. Then we will be able to choose the answer out of the given options.


Complete Step by Step Answer:
The smooth muscles are of two types: single-unit and multi-unit. Based on the working of the different organs these are present on the walls of those organs. Single-unit smooth muscles are made up of multiple cells which are connected together through connexins which can then be stimulated in a rhythmic pattern from only one input. Also, such different single-unit smooth muscles are connected to each other through these connexins and communicate in case of any input signals. Single-unit smooth muscles are found on the walls of all hollow organs which include the intestines, stomach, and urinary bladder.

Multi-unit smooth muscles differ from single-unit smooth muscles in their structure as in the multi-unit smooth muscles each smooth muscle cell receives its own input which in turn gives much finer control to the multi-unit smooth muscles. Multi-unit smooth muscles are found in the walls of all those organs which carry either air or blood, which include lungs and large arteries.

Thus, Option (A) is correct.


Note: In the above answer, we can find that the muscles are also of different types so that they help in carrying different types of fluids in the body from one organ to another.