Question

Venous heart is found in
(a) Amphibians
(b) Reptiles
(c) Birds
(d) Fishes

Answer 1

Hint: It is a type of heart in which the right side of the heart is present, which contains one auricle (right) and one ventricle. The venous heart is basically a two-chamber heart.

Complete answer:
Fish have a closed-loop circulatory system and possess a two-chambered heart. The heart pumps the blood in a single loop all over the body. The deoxygenated blood is carried by auricle from the body, and from this auricle the deoxygenated blood goes to the ventricle, blood sent to purification.
Amphibians- they possess three-chambered hearts.
Reptiles- they possess three-chambered hearts, except crocodiles.
Bird- they possess four-chambered hearts.
In most fish, the heart consists of four parts, including two chambers and an entrance and exit. The first part is the sinus venosus, a thin-walled sac that accumulates blood from the fish's veins before permitting it to flow to the second part, the atrium. The atrium is a large muscular chamber, present as a one-way passage, that sends blood to the third part, the ventricles. The ventricle is a thick-walled, muscular chamber that pumps the blood, first to the fourth part, bulbus arteriosus. The bulbus arteriosus is a large tube, and then out of the heart, which attaches to the aorta, through which blood flows to the gills for oxygenation.
So, the correct answer is ‘Fishes’.

Note: The function of the circulatory system is to distribute nutrients, oxygen, and hormones to all parts of the body and remove the metabolic waste which is carried to the excretory organs.