EduNinjaAll mammals have a double circulatory system. Fig. 1.1 shows part of the human double circulatory system.
Fig. 1.1
Describe what is meant by the term double circulation.
State one advantage of a double circulation.
Describe how blood is transported from the vena cava to the lungs. You may use the letters on Fig. 1.1 in your description.
Fig. 1.1 is a diagram of the human heart. The diagram shows the phase during the heart beat when the atria contract. The blood vessels that carry blood to and from the heart are labelled A to F.
Fig. 1.1
State the function of valves 1 and 2 in the heart.
Fig. 1.1 is a simplified diagram of the circulatory system in humans.
Fig. 1.1
State the evidence from Fig. 1.1 that the diagram shows a double circulation system.
Mammals have a double circulation.
Fig. 2.1 is a diagram of a section through the heart of a mammal. The arrows show the direction of blood flow through the heart and blood vessels.
Fig. 2.1
Fig. 2.2 is a diagram that shows the double circulation of a mammal. The arrows indicate the movement of oxygen and carbon dioxide in and out of the blood.
Fig. 2.2
Describe the evidence shown in Fig. 2.2 that the mammal has a double circulatory system.
Explain the advantages of a double circulation.
Fig. 2.1 shows a cross-section of a human heart.
Fig. 2.1
Complete the sentence about blood vessel C.
Blood vessel C transports blood from the to the
。
Fig. 3.1 is a diagram of a section through a human heart.
Fig. 3.1
A red blood cell enters the vena cava at A in Fig. 3.1.
Explain how the red blood cell is moved from the vena cava to the aorta.
In a mammal, what ensures the blood flows one-way round the circulatory system?
brain
capillaries
lungs
valves
The diagram shows a circulatory system.
Which vessels carry oxygenated blood?
1 and 2
1 and 4
2 and 3
2 and 4
The diagram shows a circulatory system.
Which vessels carry oxygenated blood?
1 and 2
1 and 4
2 and 3
2 and 4
The diagram shows a circulatory system.
Which vessels carry oxygenated blood?
1 and 2
1 and 4
2 and 3
2 and 4