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The diagram shows a section through the left side of the heart as seen from the front.
The black arrows indicate the direction of blood flow.
a.
A
atrioventricular (bicuspid) valves
i.
On the diagram, use an arrow and the letter A to show the left atrium.
(1 mark
ii. Give two features of the diagram which show that the ventricle is contracting.
1.
2.
iii. Name the vessel through which blood enters the left side of the heart.
(2 mark

The diagram shows a section through the left side of the heart as seen from the front The black arrows indicate the direction of blood flow a A atrioventricular class=

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Answer:

i. The two features of the diagram that show the ventricle is contracting are:

1. The atrioventricular (bicuspid) valves are closed.

2. The walls of the ventricle appear thicker and more muscular.

ii. The vessel through which blood enters the left side of the heart is the pulmonary vein.