Animal Kingdom Ques 123
123. Closed circulatory system occurs in vertebrates and some invertebrates
(a) snail
(b) cockroach
(c) cuttlefish
(d) all of these
Show Answer
Answer : c
Hints & Solutions
(c) Cockroach & snail have open type of circulatory system. Open type of blood circulatory system occurs in cuttlefish. Closed circulatory systems (evolved in echinoderms and vertebrates) have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities. Blood flow is not sluggish.
BETA
