MICROANATOMY

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. From there, oxygenated blood is supplied to different body tissues. From tissues, deoxygenated blood comes back to the heart.

Detailed explanation-2: -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-3: -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-4: -The right ventricle (RV) pumps oxygen-poor blood through the pulmonary valve (PV) into the main pulmonary artery (MPA). From there, the blood flows through the right and left pulmonary arteries into the lungs.

Detailed explanation-5: -Heart has four chambers-two upper atria and two lower ventricles. The right atrium receives deoxygenated blood from the body and pumps it to the right ventricle. The right ventricle pumps this deoxygenated blood into the lungs.