NCERT Class 9 Science Solutions: Chapter 6 – Tissues Part 2 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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_ (II) _Image_Showing_Smooth_Muscle_Fibre
Q_6_ (III) _Image_Showing_Cardiac_Muscle_Fibre

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.

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