The Heart and Blood Vessels (open and closed blood systems)

Question 1

How many types of circulatory systems are there?

Answer 1

There are two circulatory systems

Question 2

What are the two types of circulatory systems?

Answer 2

Open systems

Closed systems

Question 3

What does an open circulatory system mean?

Answer 3

An open circulatory system means blood leaves blood vessels and flows around the cells of the animal’s body before re-entering blood vessels again

Question 4

What type of circulatory system means blood leaves blood vessels and flows around the cells of the animal’s body before re-entering blood vessels again?`

Answer 4

An open circulatory system

Question 5

What are some examples of animals with open circulatory systems?

Answer 5

Crabs
Lobsters
Insects
Spiders
Snails
Slugs

Question 6

What type of circulatory systems do crabs and lobsters have?

Answer 6

An open circulatory system

Question 7

What does a closed circulatory system mean?

Answer 7

A closed circulatory system means blood remains in a continuous system of blood vessels

Question 8

What type of circulatory system means blood remains in a continuous system of blood vessels?

Answer 8

A closed circulatory system

Question 9

In a closed circulatory system how are materials exchanged between the blood and cells?

Answer 9

Materials are exchanged between the blood and cells through the thin walls of the smallest blood vessels

Question 10

What is an example of an organism with a closed circulatory system?

Answer 10

Humans

Question 11

What type of circulatory system do humans have?

Answer 11

A closed circulatory system

Question 12

Which type of circulatory system is more efficient?

Answer 12

A closed system

Question 13

Why is a closed circulatory system more efficient than an open circulatory system?
(2)

Answer 13

Animals can have a higher metabolic rate

The flow of blood can be increased or decreased

Question 14

How does a closed circulatory system allow an animal to have a higher metabolic rate than those with an open circulatory system?
(3)

Answer 14

Blood can be pumped around the body faster

This allows nutrients and oxygen to be distributed faster to the cells

This is turn allows the animal to be more active i.e. have a higher metabolic rate

Question 15

How does the closed circulatory system’s ability to increase or decrease blood flow make it a more efficient system than the open circulatory system?
(3)

Answer 15

A closed system allows the flow of blood to different organs to be increased or decreased

For example, more blood can be supplied to the leg muscles when the animal is running

This can be put to use by hunting predators or fleeing prey