NCERT Solutions for Class 9 Science Chapter 6
Tissues
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-79
Questions No- 7
What is the specific function of the cardiac muscle?
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The specific function of cardiac muscle, found exclusively in the heart, revolves around its ability to contract rhythmically and involuntarily. Here’s an informative breakdown:
1. Pumping Action: Cardiac muscle’s primary function is to contract and relax rhythmically, enabling the heart to pump blood throughout the body continuously.
2. Circulation of Blood: Through its contractions, the cardiac muscle ensures the circulation of blood, pushing oxygenated blood to various body parts while receiving deoxygenated blood back from the body’s tissues.
3. Maintenance of Blood Flow: By contracting and relaxing in a coordinated manner, the cardiac muscle maintains the flow of blood in a specific direction through the heart’s chambers (atria and ventricles) and via the intricate network of blood vessels.
4. Supporting Organ Function: The rhythmic contractions of cardiac muscle supply oxygen and nutrients to organs and tissues across the body, sustaining their proper function and health.
5. Generation of Heartbeat: The continuous and coordinated contractions generate the heartbeat, ensuring a regular rhythm crucial for maintaining adequate blood pressure and efficient distribution of oxygenated blood to all body tissues.
In essence, the unique function of cardiac muscle lies in its capacity to contract rhythmically and involuntarily, propelling the heart’s pumping action to ensure continuous blood circulation, support organ function, and maintain the vital flow of oxygen and nutrients throughout the body.
Cardiac muscle is present in the heart. It contracts and relaxes rapidly and continuously with a rhythm, but it never gets fatigued
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.
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