The Heart and Blood Vessels (double circulation)

Question 1

Why is the septum necessary in the heart?

Answer 1

To separate deoxygenated blood and oxygenated blood

Question 2

What is the separation of deoxygenated blood and oxygenated blood in the heart a vital part of?

Answer 2

The two circuit circulatory system in humans

Question 3

What are the two circuits that make up the two-circuit circulatory system in humans?

Answer 3

The pulmonary circuit and the systemic circuit

Question 4

In the pulmonary circuit, where is blood pumped to and from?

Answer 4

Blood is pumped from the heart to the lungs and back to the heart

Question 5

What part of the heart is responsible for pumping the blood in the pulmonary circuit?

Answer 5

The right ventricle

Question 6

What does blood gain in the pulmonary circuit?

Answer 6

Oxygen

Question 7

Where does blood gain oxygen in the pulmonary circuit?

Answer 7

In the lungs

Question 8

What effect does the length of the pulmonary circuit have on the walls of the right ventricle?

Answer 8

The walls of the right ventricle are fairly thin as the circuit is relatively short

Question 9

In the systemic circuit, where is blood pumped to and from?

Answer 9

Blood is pumped from the heart to the body to the heart

Question 10

What part of the heart is responsible for pumping the blood in the systemic circuit?

Answer 10

The left ventricle

Question 11

What does blood lose and gain in the systemic circuit?

Answer 11

It loses oxygen and gains carbon dioxide

Question 12

What affect does the length of the systemic circuit have on the walls of the left ventricle?

Answer 12

The walls of the left ventricle are thicker and stronger than those of the right ventricle as the systemic circuit is a much longer route than the pulmonary circuit

Question 13

What are the benefits of a double-circulation system?

2

Answer 13

It allows oxygen-rich and oxygen-poor blood to be kept separate

It ensures that the blood pressure is high enough to reach all parts of the body

Question 14

What does single-circulation mean?

Answer 14

This means that blood is pumped from their heart, around the body and back to the heart again in a single circuit

Question 15

Why do animals with single-circulation systems have low metabolisms?

Answer 15

As this system can only produce low pressure around most of the body which restricts the metabolism of the animal

Question 16

What are two examples of animals with single-circulation systems?

Answer 16

Earthworms

Fish

Question 17

What type of circulation systems do earthworms and fish have?

Answer 17

Single-circulation systems