Question

Describe the blood vascular system of scoliodon

Answer 1

Explanation:

shaped muscular tube. It lies in the pericardial cavity, bounded by a two-layered membranous pericartium. It is a median triangular cavity lying between the gills with the apex directed forwards, and is almost completely occupied by the heart. The heart of Dogfish (Scoliodon) contains only the impure blood, hence, it is called venous or branchial heart.

The heart consists of four chambers:

(a) The sinus venosus,

(b) The atrium,

(c) The ventricle and

(d) The conus arteriosus.

Answer 2

Explanation:

respiratory organs of whale are