Question

Amongst molluscs, closed type of circulatory system is found in
A) Pila
B) Union
C) Sepia
D) None of these

Answer 1

Hint:Cephalopods are the most "exceptional" of the mollusks. Squids and octopi are the great representation of cephalopods. They have a shut circulatory framework so they can move a lot quicker - the shut circulatory framework permits more proficient "pinpointing" of blood.

Complete answer:
The closed circulatory system (evolved in echinoderms and vertebrates) keeps blood in blood vessels of different sizes and wall thicknesses. In this type of system, the heart pumps blood through the blood vessels and usually does not fill the body cavity. Poor blood flow.
The open circulatory system (evolved in insects, mollusks and other invertebrates) pumps blood into the blood co, and the blood diffuses back into the circulatory system between cells. The heart pumps blood into the body cavity, and the body tissues are surrounded by blood.
Class sepia includes squid, octopus, and cuttlefish. These creatures are molluscs, but they have a closed circulatory system. Except for tan, all other molluscs show an open circulatory system. Deoxygenated blood travels from the body to the heart, from the heart to the lungs. In the lungs, the blood is oxidized and then returns to the heart. Finally, the oxidized blood enters the capillaries and spreads throughout the body.

Thus the option (C) is the correct answer.

Note:The circulatory system of the human body stretches for 66,000 miles, which is more than two and a half times the circumference of the earth. At the age of 75, the heart beats 2.5 billion times. The heart discharges 2 ounces of blood every time it beats, and 5 quarts of blood every minute, reaching 220 million quarts in 70 years.