G9-TRANSPORT IN ANIMALS

What ensures one-way flow of blood in the circulatory system?

• atria  

• septum   

• valves

• ventricles

Which statements describe how the structures in the circulatory system function?

1 a muscular pump to push blood into vessels

2 valves to ensure one-way blood flow

3 veins to take blood away from the heart

4 vessels to return blood to the heart

•  1, 2 and 3

• 1, 2 and 4 

• 1, 3 and 4

• 2, 3 and 4

Parts of the human circulatory system are listed. 

1 arteries 

2 capillaries 

3 heart 

4 veins 

Which structures have valves to ensure the one-way flow of blood? 

• 1 and 2

• 2 and 4

• 2 and 3

• 3 and 4

Which statement describes the circulation of blood in the human body?

• Blood is pumped away from the heart by the atria.

• Blood is pumped away from the heart through arteries.

• Blood is pumped away from the heart through veins.

•  Blood is pumped to the heart through capillaries.

Which pathway is taken by blood in a fish?

• gills → heart → body → gills

• body → gills → heart → body

• heart → gills → body → heart 

• heart → body → gills → body

Which row shows correct features of the circulatory system of a fish?

• A

• B

• C

• D

The diagrams show the single circulation of a fish and the double circulation of a mammal.

Which letters represent areas with the most oxygenated blood? 

• R and X

• S and Y

• T and Y

• T and Z

What is an advantage of having a double circulatory system? 

• It uses less energy because blood flows through the heart only once in each circuit around the body.

• Concentration gradients of solutes and gases are kept low.

• Deoxygenated and oxygenated blood are separated to allow a high rate of oxygen supply to the tissues.

• It maintains high-pressure blood flow to the lungs and low-pressure blood flow to the body

The diagram shows a section of the human heart.

Which label identifies the right ventricle?

• A

• B

• C

• D

The diagram shows a section through a human heart. Which blood vessel is the pulmonary vein?

• A

• B

• C

• D