Closed circulatory systems

Question 1

In closed circulatory system, what are the characteristics of the transport medium?

Answer 1

Transport medium (blood) is enclosed in blood vessels
Blood doesn't come into direct contact with cells of the body

Question 2

In closed circulatory systems, where is the transport medium pumped?

Answer 2

Transport medium is pumped by heart under pressure.

Transport medium returns directly to heart.

Question 3

How do substances enter and leave the transport medium in closed circulatory systems?

Answer 3

Substances enter and leave by diffusing through the walls of the blood vessels

Question 4

In closed circulatory systems, can the flow of transport medium be varied? Explain why.

Answer 4

Yes - amount of blood flow to a particular tissue can be adjusted, by widening or narrowing blood vessels

Question 5

What do most closed circulatory systems carry in their transport medium?

Answer 5

A blood pigment that carries respiratory gases

Question 6

In what type of organisms are closed circulatory systems found?

Answer 6

In vertebrates