NCERT Class 9 Science Solutions: Chapter 6 – Tissues Part 2

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Question 6

Q. Diagrammatically show the difference between the three types of muscle fibres.

Answer:

Q 6 (I) Image Showing Striated Muscle Fibre.

Q 6 (I) Image Showing Striated Muscle Fibre

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Q 6 (II) Image Showing Smooth Muscle Fibre.

Q 6 (II) Image Showing Smooth Muscle Fibre

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Q 6 (III) Image Showing Cardiac Muscle Fibre.

Q 6 (III) Image Showing Cardiac Muscle Fibre

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Question 7

Q. What is the specific function of cardiac muscle?

Answer:

Cardiac muscles are involuntary muscles which show characteristics of both smooth and striated muscles. These muscles occur in the walls of the heart.

Functions of Cardiac Muscles

  • Cardiac muscles contract and relax rapidly, rhythmically and tirelessly throughout life. They contract endlessly from early embryonic stage until death.

  • The contraction and relaxation of heart muscles help to pump and distribute blood to various parts of body.

  • The cardiac muscle is to control the contraction and relaxation of the heart is the specific function of cardiac muscle.