Explain the Circulatory system of Rabbit with a neat labelled diagram of a Heart.

Explanation

The Circulatory system consists of blood, blood vessels and Heart. The Heart is pear shaped, lies in between the lungs, in the thoracic cavity. Heart is covered by a double layered Pericardium. The Heart is four chambered, with two Auricles and two ventricles. The right and the left ventricles are separated by inter auricular septum. The right and the left ventricles are separated by inter ventricular septum. The right auricle opens into the right ventricle, by right Auriculoventricular aperture, guarded by a tricuspid valve. The left auricle poens into the left ventricle by left Auriculoventricular aperture, guarded by a bicuspid valve or Mitral valve. The opening of the Pulmonary Artery and Aorta are guarded by three semilunar valves.
The right Auricle receives deoxygenated blood through two Precaval (superior vena cava) and one postcaval (Inferior vena cava) veins from all parts of body. The left auricle receives oxygenated blood from the pulmonary veins from the lungs.
Form the right ventricle arises Pulmonary trunk, which carries the deoxygenated blood to the lungs and from the left ventricle arises the systemic arch (aorta) which supplies Oxygenated blood to all parts of body.
Activity 1
(i) Observe the external morphology of leech specimen in your biology laboratory.
Observe the external morphology of Leech in the preserved bottle specimens in the Biology Laboratory.
(ii) Can you find leeches in your locality?
No, Not in our areas. The Leeches are common in hilly areas
(iii) In which geographical areas are leeches found more predominanty in India?
Most Leech species are found in shallow, slow moving fresh water and moist soil on land.