Question

Heart of Frog is-
A. Two chambered
B. Three chambered
C. Four chambered
D. Five chambered

Answer 1

Hint: The heart of a frog is a dark-colored, muscular organ. The heart is situated ventrally to the liver in the pericardial cavity. It is enclosed between the inner and outer pericardium. Pericardial fluid is also present, which protects the heart from external injury and provides the frictionless motion of the heart.

Complete answer:
- The heart of the frog has three chambers: two atria and a single ventricle.
- From the veins that drain the blood from the various organs of the body, the atrium receives deoxygenated blood.
- From the lungs and skin, the left atrium receives oxygenated blood. It also serves as a gas exchange organ.
- Both atria empty into the single ventricle.
- The ventricle is divided into narrow chambers. These chambers reduce the mixing of the two blood.
- So when the ventricular contraction occurs, oxygenated blood from the left atrium is sent into the carotid arteries taking blood to the head;
- Deoxygenated blood from the right atrium is then sent to the pulmocutaneous arteries. Blood passes to the skin and lungs where fresh oxygen can be picked up.
- The blood passing into the aortic arches has been thoroughly mixed, even so, it contains enough oxygen to supply the needs of the rest of the body.

Hence, the correct answer is option (B).

Additional information:
1. Two chambered hearts (one atrium and one ventricle) is observed in fishes.
2. Four chambered hearts can be observed in mammals and birds.
3. Five chambered hearts are observed in bees.

Note: The blood vascular system comprises- lymph, lymph channels, and lymph nodes. The heart of the frog is a muscular structure situated in the upper part of the body cavity. It has 3 chambers and is covered by a membrane called the pericardium. The ventricle further opens into a sac-like conus arteriosus on the ventral side of the heart. Thus the heart of the frog has three chambers.