Question

Single heart circuit occurs in
A) Fishes
B) Frog
C) Reptiles
D) Man

Answer 1

There is basically three types of circulations:-
Systemic circulation- systemic circulation carries oxygenated blood from the left ventricle to arteries and then from there to capillaries and then to the tissues of the body.
Coronary circulation- Coronary circulation is the circulation of blood in the blood vessels that supply the heart muscle.
Pulmonary circulation- The pulmonary circulation is the portion of the circulatory system which carries deoxygenated blood away from the right ventricle, to the lungs, and returns oxygenated blood to the left atrium and ventricle of the heart.

Complete answer:
Option A:- fishes- In fish, the system has only one circuit, with the blood being pumped through the capillaries of the gills and the capillaries of tissues. Fish have a closed-loop circulatory system.
Option B:- frog- frogs are amphibians that have a closed circulatory system. Frogs generally have one heart to pump blood through it unless there is a mutation. Frogs have three-chambered hearts which include two atriums and one ventricle.
OptionC:- Reptiles- basically reptiles have three-chambered heat which includes two atria and one partially divided ventricle. The reptilian heart has a septum that partially divides ventricles. This allows a better division of oxygenated and deoxygenated blood.
Option D:- Man- The essential components of the cardiovascular system are the heart, blood, and blood vessels. It includes pulmonary circulation. Which is a kind of "loop" circulation, in which loop through lungs where deoxygenated blood is being oxygenated. And systemic circulation "loops" through the rest of the body to provide oxygenated blood.

Therefore the correct answer is option"C".

Note: In the single circulatory system, the blood first passes towards the gills from the heart, and then after purification or after being oxygenated the blood will get distributed in the whole body. Only one cardiac cycle is being completed here therefore it is known as a single circulatory system. This system is also known as gills circulation. Examples of single circulatory systems are Fishes, birds, reptiles, etc.