NEET BIOLOGY

Detailed explanation-1: -Fishes have a two-chambered heart consisting of an atrium and a ventricle. The heart receives deoxygenated blood from tissues and it is pumped out to gills for purification.

Detailed explanation-2: -The right atrium receives oxygen-poor blood from the body and pumps it to the right ventricle through the tricuspid valve. The right ventricle pumps the oxygen-poor blood to the lungs through the pulmonary valve.

Detailed explanation-3: -In single circulation, the blood passes through a single circuit – where blood is pumped by the heart to the gills for oxygenation, after which the blood flows to the rest of the body and back to the heart. Animals such as fish are known to have single circulatory systems.

Detailed explanation-4: -The heart pumps deoxygenated blood from the right ventricle to the lungs and at the same time pumps oxygenated blood from the left ventricle into the aorta.

Detailed explanation-5: -Pulmonary circulation is the system of transportation that shunts de-oxygenated blood from the heart to the lungs to be re-saturated with oxygen before being dispersed into the systemic circulation.