Advertisements
Advertisements
प्रश्न
With the help of a suitable diagram, describe the conducting system of the human heart.
Advertisements
उत्तर
- The human heart is myogenic, which means that it may generate a cardiac contraction through specialised conducting (nodal) tissue.
- The conducting (nodal) tissue is made up of the SA node (sino-atrial node), the AV node (atrioventricular node), and a bundle of His and Purkinje fibres.
- The SA node is located in the right atrium at the superior vena cava entrance.
- The SA node generates a contraction wave and sends it to the AV node and the left ventricle.
- The AV node is located in the right atrial wall near the base of the interatrial septum and the coronary sinus entrance. The contraction wave is sent to both ventricles by the AV node.
- A bundle of His branches begins at the AV node and travels along the interventricular septum. It divides into two branches, one for each ventricle.
- These branches form a network in the ventricle walls. Purkinje fibres are the fibres found in these branches.
- A bundle of His and Purkinje fibres transmits the contraction wave to both ventricles.
APPEARS IN
संबंधित प्रश्न
Differentiate between the following pairs on the basis of the aspect given in the brackets.
Respiration and Photosynthesis (Gas released)
Give suitable explanation for the following :
Why does gaseous exchange continue in the lungs even during expiration?
The volume of air in the lungs and the rate at which it is exchanged during inspiration and expiration was measured.
The following diagram shows a group of the lung volumes and capacities.
Study the diagram carefully and explain briefly the following :
Vital capacity (VC)
Name the following:
Respiratory process in which oxygen is utilized.
Write true or false for the following statement. Rewrite the false statement correctly.
The exchange of gases through the skin is called cutaneous respiration.
Name the following:
Body cavity in which lungs are situated.
Give the functions of the following:
Conchae
The question has four options. Choose the correct answer:
Covering of lung is called
The question has four options. Choose the correct answer:
During respiration, the diaphragm
The volume of air that is present in the respiratory tract (from nose to the terminal bronchioles) but not involved in gaseous exchange is called ______.
