Question

Write notes on working of the heart of rabbit

Answer 1

• The heart of rabbit exhibits rhythmic contractions and relaxations.
• The contraction is called Systole while the relaxation is called Diastole.
• The systole and diastole are together referred as Heart beat.
• The heart beat is initiated by a special node of muscular tissue called sinu - auricular node present on the inner wall of right auricle.
• The sinuauricular node acts as pace maker and generates certain power in the form of electric impulses.
• The frequencies of the impulses are governed by nerve fibres.
• Such impulses are conveyed to the muscles of heart to exhibit rhythmic contractions and relaxations.
• The impulses are also picked up by another node called auriculo -ventricular node lying on the inter-auricular septum.
• The impulses are conveyed to Bundle of His and purkinje fibres runningthrough inter - ventricular septum to carry to the wall of ventricles.
• The right auricle receives impure or de-oxygenated blood from different regions of the body by two superior venae cavae and one inferior vena cava.
• The left auricle receives pure or oxygenated blood from the lungs by means of pulmonary veins.
• When the auricles are filled by blood they contract to force the blood into the two ventricles through auriculo- ventricular apertures.
• When the ventricles are filled with blood, they contract to force the blood into aortic trunks.
• The backward flow of blood from the ventricles into the auricles isprevented by the closure of bicuspid and tricuspid valves.
• The closure of the bicuspid and tricuspid valves produces first heart beat.
• When the ventricles contract the semilunar valves situated at the base of carotico - systemic trunk and pulmonary aorta are opened.
• As a result the deoxygenated blood from the right ventricle is forced into pulmonary aorta while the pure blood from left ventricle is forced into Aortic arch.
• Now the semilunar valves close to prevent the downward flow of blood from aortic trunks into the ventricles.
• The closure of semilunar valves produces the second heart beat.
• The pulmonary aorta carries deoxygenated blood to the lungs for aeration.
• The aortic trunk supplies pure blood to different organs of the body.
• In different parts of the body the blood gets deoxygenated due to the release of C02.
• The aerated blood from lungs and deoxygenated blood from the tissues enter into the heart to repeat the circulation once again.

Answer 2

The heart of rabbit exhibits rhythmic contractions and relaxations.
The contraction is called Systole while the relaxation is called Diastole.
The systole and diastole are together referred as Heart beat.
The heart beat is initiated by a special node of muscular tissue called sinu - auricular node present on the inner wall of right auricle.
The sinuauricular node acts as pace maker and generates certain power in the form of electric impulses.
The frequencies of the impulses are governed by nerve fibres.
Such impulses are conveyed to the muscles of heart to exhibit rhythmic contractions and relaxations.
The impulses are also picked up by another node called auriculo -ventricular node lying on the inter-auricular septum.
The impulses are conveyed to Bundle of His and purkinje fibres runningheart-beat through inter - ventricular septum to carry to the wall of ventricles.
The right auricle receives impure or de-oxygenated blood from different regions of the body by two superior venae cavae and one inferior vena cava.
The left auricle receives pure or oxygenated blood from the lungs by means of pulmonary veins.
When the auricles are filled by blood they contract to force the blood into the two ventricles through auriculo- ventricular apertures.
When the ventricles are filled with blood, they contract to force the blood into aortic trunks.
The backward flow of blood from the ventricles into the auricles israbbit-circulatory-system-mammals prevented by the closure of bicuspid and tricuspid valves. The closure of the bicuspid and tricuspid valves produces first heart beat.
When the ventricles contract the semilunar valves situated at the base of carotico - systemic trunk and pulmonary aorta are opened.
As a result the deoxygenated blood from the right ventricle is forced into pulmonary aorta while the pure blood from left ventricle is forced into Aortic arch.
Now the semilunar valves close to prevent the downward flow of blood from aortic trunks into the ventricles.
The closure of semilunar valves produces the second heart beat.
The pulmonary aorta carries deoxygenated blood to the lungs for aeration.
The aortic trunk supplies pure blood to different organs of the body.
In different parts of the body the blood gets deoxygenated due to the release of C02.
The aerated blood from lungs and deoxygenated blood from the tissues enter into the heart to repeat the circulation once again.

Hope this will help you .....✌