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प्रश्न
Explain with the help of a suitable diagram conducting system of human heart.
With the help of a neat and labelled diagram, explain the conducting system of human heart.
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उत्तर
- Human heart is myogenic (myo-muscle, genic-originating from). The heart beat originates in modified cardiac muscles called Sinoatrial node (SA node) which lies in the wall of right atrium near the opening of superior vena cava.
- The SA node is called pace maker because it has the power to generate of wave of contraction.
- The wave of contraction of cardiac impulse generated by SA node is conducted by cardiac fibres to both the atria causing their contraction (atrial systole).
- The atrioventricular node (AV node) is located in the wall of right atrium near the opening of coronary sinus and receives the wave of contraction generated by the SA node through internodal pathway.
- The Bundle of His arises from AV nodes and divides into right and left bundle branches located in the interventricular septum.
- The bundle branches give rise to Purkinje fibres which penetrate into myocardium of ventricles. The bundle of His and Purkinje fibres conduct the wave of contraction from the AV node to the myocardium of ventricles causing their contraction (ventricular systole).
संबंधित प्रश्न
What is hypertension? Why is it caused? What harm can it do?
The human body has an organ A which acts as a double pump. The oxygenated blood coming from the lungs through blood vessel B enters the upper left chamber C of the double pump. When chamber C contracts, then blood goes into the lower left chamber D. The contraction of chamber D forces the blood to go into a blood vessel E which supplies oxygenated blood to all the organs of the body (except the lungs). The deoxygenated blood coming out of the body organs is taken by a blood vessel F to the right upper chamber G of the pumping organ. Contraction of chamber G forces the deoxygenated blood into the right lower chamber H. And finally, the contraction of chamber H sends the deoxygenated blood into the lungs through blood vessel I.
- What is organ A?
- Name the blood vessel (i) B (ii) E (iii) F, and (iv) I.
- What are chambers (i) C, and (ii) D?
- What are chambers (i) G and (ii) H?
Fill in the blank with suitable word given below:
The two lower chambers of the heart are called ___________.
Choose the correct answer:
Which of the following engulfs pathogen rapidly?
Give Technical Term for the following:
The phase of cardiac cycle in which the auricles contract
Choose the Odd One Out:
The free edges of cuspid valves are attached to the papillary muscles of the heart by fibres are called ______.
The rate of heartbeat is determined by ______.
State the exact location of the following structure.
Papillary muscles
Where is the following located?
Mitral valve
