Question

Pylangium in frog occurs in
A. Conus arteriosus
B. Sinus venosus
C. Atrium
D. Ventricles

Answer 1

Frog belongs to a class of amphibians which means they can live on both land and water.
The most common species found in India is Rana tigris.
Frog consists of a closed type vascular system.
Frog contains lymphatic system also.
The blood vascular system involves heart, blood vessels and blood.

Complete answer:
Heart is a special type of organ present in the body of a frog which helps in pumping of blood and transports the important nutrients to other parts of the body.
Heart is a muscular organ present in the upper part of the body in the frog.
The heart of cockroach consists of three chambers:
1. Two atrium
2. One ventricle.
Pericardium is the membrane which covers the atrium and ventricles.
A triangular structure is present in the heart which is known as sinus venosus that joins the right atrium.
The right atrium receives blood from the major vein called the vena cava.
The ventricle opens into a sac-like structure known as conus arteriosus on the ventral side of the heart.
The arteries help in distributing the blood to the whole of the body parts and form the arterial system whereas veins collect blood from different parts of the body and form the venous system.
The truncus arteriosus is a basal thick-walled conus arteriosus and a distal thin-walled ventral aorta.
Its conus arteriosus part which is next to the ventricle is known as pylangium and the distal ventral part as synangium.
Pylangium is a short tubular structure, while synangium is simply formed by the union of the basal parts of the arteries.

So, the correct option is option A. Conus arteriosus.

Note: The blood consists of plasma and cells.
The blood cells are:
1. RBCs or Red blood cells.
2. WBCs or White blood cells.
3. Leucocytes
4. Platelets.
The blood carries nutrients, gases and water to the different parts during the circulation.
Circulation is achieved by pumping the action of the heart.