Question

Heart pumps only impure blood in:

• A. Sharks
• B. Whale
• C. Lizard
• D. Frog

Answer 1

The correct option is A Sharks

• The heart pumps only impure blood in sharks. Sharks have a two-chambered heart which is an S-shaped tube. It has an atrium and ventricle. The blood is pumped by the heart through the afferent branchial arteries to capillaries in the gills, where the blood is oxygenated).
• The blood then flows through efferent branchial arteries, through the tissues of the body, and back to the heart in veins. Sharks have low blood pressures; the walls of the pericardium are rigid, creating suction within the pericardium to maintain the flow of blood. To circulate blood throughout their bodies, many sharks must swim continuously.
• The blood flow is similar to humans because blood is pumped by the heart to the rest of the body by arteries and returned to the heart by veins.
• A difference is that humans have 4-chambered hearts while sharks only have two chambers.