22
Briefly mention the steps in double-circulation through human heart.
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• Oxygenated blood from lungs comes to left atrium which pushes it to left ventricle $\rightarrow$ (½ Mark)
• Left ventricle contracts to push blood into aorta, to be sent to body parts $\rightarrow$ (½ Mark)
• Deoxygenated blood from body parts is collected and sent to right atrium $\rightarrow$ (½ Mark)
• Right atrium pushes it to right ventricle, to be sent to lungs for oxygenation. (½ Mark)
• Left ventricle contracts to push blood into aorta, to be sent to body parts $\rightarrow$ (½ Mark)
• Deoxygenated blood from body parts is collected and sent to right atrium $\rightarrow$ (½ Mark)
• Right atrium pushes it to right ventricle, to be sent to lungs for oxygenation. (½ Mark)