Advertisements
Advertisements
Question
What is the significance of atrio-ventricular node and atrio-ventricular bundle in the functioning of heart?
Solution
- Atrioventricular node (AVN):
- A tissue group made up of muscles and neural tissues similar to the node is found at the base of the septum between the two atriums, which is called the A.V. node.
- This S.A. Inspired by the impulses of the node, it controls the contraction and relaxation of the ventricles through neural branches called His bundle.
- Atrioventricular bundle (AVB):
- His (His, 1893) first described A.V. I discovered the A.V. node. This later came to be known as ‘Bundle of His’. It is made of a special type of muscle fibre, which is anatomically different from the cardiac muscle. It acts as a connector for inspiration from the right atrium to the ventricle.
- Stimulation A.V. It reaches the septum present in the ventricles through the node, which reaches the Purkinje fibres present in both ventricles through the Bundle of His.
APPEARS IN
RELATED QUESTIONS
Write the differences between open and closed system of circulation
Describe the evolutionary change in the pattern of heart among the vertebrates.
Sino-atrial node is called the pacemaker of our heart. Why?
Conversion of ammonia into uric acid occurs through --------------
At any given time there is more blood in the venous system than that of the arterial system. Which of the following features of the veins allows this?
Distinguish between mitral valve and semi lunar valve.
Right ventricular wall is thinner than the left ventricular wall. Why?
What are the heart sounds? When and how are these sounds produced?
Select the correct biological term.
Destroyed in the liver and spleen after circulating in the blood for four months.
Select the correct biological term.
The substances which gives red cells their colour.
Which among the followings is correct during each cardiac cycle?
The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is ______.
Read the following statements and choose the correct option
Statement 1: Atria receive blood from all parts of the body which subsequently flows to ventricles.
Statement 2: Action potential generated at sino-atrial node passes from atria to ventricles.
The walls of ventricles are much thicker than atria. Explain.
Write the features that distinguish between the two.
Open and Closed circulatory system
Write the features that distinguish between the two.
Sino-atrial node and Atrio-ventricular node
Answer the following:
What is specific in the heart of crocodiles among reptilians?
In the diagrammatic presentation of heart given below, mark and label, SAN, AVN, AV bundles, bundle of His and Purkinje fibres.
