3.1.2: Transport In Animals

Question 1

What type of circulatory system do fish have?

Answer 1

Single closed circulatory system

In this system, blood passes through the heart once per cycle.

Question 2

How many times does blood pass through the heart in a double circulatory system?

Answer 2

Twice per cycle

This system is characteristic of birds and most mammals.

Question 3

What is the main function of the first circuit in a double circulatory system?

Answer 3

Carries blood from the heart to the lungs for gas exchange

This circuit is essential for oxygenating the blood.

Question 4

What does the second circuit of blood vessels in a double circulatory system do?

Answer 4

Carries blood from the heart to the rest of the body to deliver oxygen and nutrients and to collect waste

This ensures that the body’s tissues receive the necessary substances.

Question 5

What is the mechanism that allows efficient gas exchange in fish?

Answer 5

Counter-current flow mechanism

This mechanism helps maximize oxygen absorption in the gills.

Question 6

What are the three main components found in most blood vessels?

Answer 6

• Collagen
• Smooth muscle
• Elastic tissues

These structures help blood vessels perform their transport functions.

Question 7

Fill in the blank: In a single circulatory system, blood flows through _______ to become oxygenated.

Answer 7

Capillaries in the gills

This process occurs immediately after being pumped out of the heart.

Question 8

True or False: A single circulatory system is efficient for mammals.

Answer 8

False

Mammals require a double circulatory system for efficient gas exchange.