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  • Go through the following statements                 <img alt="I." src="https://learn.ca

Go through the following statements

                I.    Skeletal muscles are closely associated with the skeletal components                         of the body

              II.    Skeletal muscles are primarily involved in locomotory actions and                         changes of body postures.

             III.    Visceral muscles exhibit striation and thus are not smooth in                             appearance. 

             IV.    The activities of skeletal muscle are not under the voluntary control of                          the nervous system and are therefore known  as involuntary muscles.

Choose the option with all correct statements

 

Option: 1

I\; and\; II


Option: 2

II\: and\: IV


Option: 3

I,II\: and\: III


Option: 4

All of the above 


Answers (1)

best_answer

 

 

Muscles and Their Types -

  • Muscle is a specialised tissue of mesodermal origin. 
  • About 40-50 percent of the bodyweight of a human adult is contributed by muscles.
  • They have special properties like excitability, contractility, extensibility and elasticity.
  • Muscles have been classified using different criteria, namely location, appearance and nature of regulation of their activities. 
  • Based on their location, three types of muscles are identified : 
    • (i) Skeletal 
    • (ii) Visceral and 
    • (iii) Cardiac

Skeletal Muscles:

  • These are closely associated with the skeletal components of the body. 
  • They have a striped appearance under the microscope and hence are called striated muscles. 
  • As their activities are under the voluntary control of the nervous system, they are known as voluntary muscles too. 
  • They are primarily involved in locomotory actions and changes of body postures.


Visceral Muscles:

  • Visceral muscles are located in the inner walls of hollow visceral organs of the body like the alimentary canal, reproductive tract, etc. 
  • They do not exhibit any striation and are smooth in appearance. 
  • Hence, they are called smooth muscles (nonstriated muscle). 
  • Their activities are not under the voluntary control of the nervous system and are therefore known as involuntary muscles. 
  • They assist, for example, in the transportation of food through the digestive tract and gametes through the genital tract.

Hence, the correct option is a. I and II

-

 

 

 

 

Posted by

Suraj Bhandari

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