Question

A: Identify organ ___ Function ___

B: Identify organ ___ Function ___

C: Identify organ ___ Function ___

D: Identify organ ___ Function ___

E: Identify organ ___ Function ___

F: Identify organ ___ Function ___

Answer 1

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Answer 2

It is circulatory system of Dogfish shark. It is labeled as below

A. Sinus venosus:- Blood enters to the heart through the sinus venosus. Function of sinus venosus is conveying the blood from body to the heart.

B.Atrium: Thin walled structure that receives blood from sinus venosus. It pumps the blood to the dorsal ventricle.

C. Ventricle: thick muscular walled cavity that pumps the blood to conus arteriosus to the gills

D. Conus arteriosus: directs the blood flow from ventricle to the ventral aorta. It contains series of semilunar valves.

E. Ventral aorta:- conus arteriosus continues as ventral aorta which branches off five pairs of afferent branchial arteries. Blood received from conus arteriosus transported to the afferent branchial arteries through ventral aorta.

F. Afferent branchial arteries: carries deoxygenated blood from central aorta to the gills for purification.