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Q: Which of the following has open vascular system?
  • A. Cockroach
  • B. Human
  • C. Rat
  • D. Birds
Correct Answer: Option A - Cockroach have an open circulatory system, with body cavities full of hemolymph (the insect version of blood). The Cockroach heart uses 13 chambers, (compared to our 4), to pump blood throughout the Cockroach's body. In open vascular system, blood pump into a hemocoel with the blood diffusing back to the circulatory system between cells.
A. Cockroach have an open circulatory system, with body cavities full of hemolymph (the insect version of blood). The Cockroach heart uses 13 chambers, (compared to our 4), to pump blood throughout the Cockroach's body. In open vascular system, blood pump into a hemocoel with the blood diffusing back to the circulatory system between cells.

Explanations:

Cockroach have an open circulatory system, with body cavities full of hemolymph (the insect version of blood). The Cockroach heart uses 13 chambers, (compared to our 4), to pump blood throughout the Cockroach's body. In open vascular system, blood pump into a hemocoel with the blood diffusing back to the circulatory system between cells.