Why is closed circulatory system considered to be advantageous?�

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41.

WBCs are also known as?

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42.

What is haemostasis?

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43.

Which cells secrete histamine?

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44.

What are antigens?

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45.

Name the four types of blood group.

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46.

Which blood group is considered to be the universal donor?

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47.

Why human heart is called double pump?

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48.

Why is closed circulatory system considered to be advantageous? 


The closed circulatory system allows the the flow of the fluid to be precisely regulated as the fluid (blood) is circulated through a closed vessel. 

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49.

Name the instrument by which heart sound during the cardiac cycle can be recorded.

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50.

In how much time cardiac cycle is completed?

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