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- 1. Multiple Choice
Which chamber of the heart has the thickest muscle wall?
Pulmonary arteryLeft ventricleAortic valveRight atrium - 2. Multiple Choice
The diagram shows a section through the heart. Which part pumps blood to the aorta?
A
B
C
D
- 3. Multiple Choice
The diagram shows a vertical section through a human heart. What are X and Y?
Left atrium and right ventricle
Right atrium and left ventricle
Right atrium and right ventricle
Left Atrium and Left Ventricle
- 4. Multiple Choice
Why is the circulatory system of mammals described as a double circulation?
It consists of two different types of blood cells.It is made up of two different types of blood vessels.It is a result of two separate hearts in the body.It consists of two separate circuits for blood flow. - 5. Multiple Choice
In which list do all three blood vessels carry oxygenated blood?
aorta, pulmonary artery, renal artery
aorta, pulmonary vein, renal artery
vena cava, pulmonary artery, renal vein
vena cava, pulmonary vein, renal vein
- 6. Multiple Choice
The diagram shows the human heart. Which two chambers contract at the same time?
W and X
Z and Y
W and Z
X and Y
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