Advertisements
Advertisements
Question
With the help of a suitable diagram, describe the conducting system of the human heart.
Advertisements
Solution
- 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
RELATED QUESTIONS
Explain with reasons.
Upward and downward movement of diaphragm occurs consecutively.
Name the following:
Respiratory process in which oxygen is utilized.
Fill in the blank.
In human beings, the exchange of gases takes place in _____.
Write true or false for the following statement. Rewrite the false statement correctly.
The exchange of gases through the skin is called cutaneous respiration.
Give the functions of the following:
Cartilaginous rings
Label the diagram given below:
Identify the parts of the lower respiratory system.
The respiratory pigment in human beings is:
Pick the odd one out from the group given below on the basis of respiratory organ. Give reason for your answer.
Name the lymphoid organ present in the human pharynx.
