Advertisements
Advertisements
प्रश्न
What are the heart sounds? When and how are these sounds produced?
Advertisements
उत्तर
-
Rhythmic contraction and expansion of heart is called heart beat. The contraction of the heart is called systole and the relaxation of the heart is called diastole. The heart normally beats 70-72 times per minute in a human adult. During each cardiac cycle two sounds are produced that can be heard through a stethoscope.
-
The first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves whereas Second heart sound (dub) is associated with the closure of the semilunar valves. These sounds are of clinical diagnostic significance. An increased heart rate is called tachycardia and decreased heart rate is called bradycardia.
संबंधित प्रश्न
Describe the evolutionary change in the pattern of heart among the vertebrates.
Sino-atrial node is called the pacemaker of our heart. Why?
What is the significance of atrio-ventricular node and atrio-ventricular bundle in the functioning of heart?
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?
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?
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.
Define the following terms and give their location?
Purkinje fibre
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:
Which part of heart is responsible for initating and maintaining its rhythmic activity?
In the diagrammatic presentation of heart given below, mark and label, SAN, AVN, AV bundles, bundle of His and Purkinje fibres.
