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Question
What is meant by the term 'double circulation' of blood in mammals? What is diastole?
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Solution
Blood flows twice in the heart before it completes one full cycle. This process of blood circulation in the human body is called double circulation.
The expansion or relaxation phase of the atria is called a diastole.
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The diagram given below represents a section of the human heart. Answer the questions that follow:
- Which parts of heart are in the diastolic phase? Give a reason to support your answer.
- Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
- What causes the heart sounds ‘LUBB’ and ‘DUP’?
- Name the blood vessels that supply oxygenated blood to the heart muscles.
- Draw neat labelled diagrams of a cross section of an artery and a vein.
The vein that carries oxygenated blood.
What is meant by human circulatory system?
Give reason for the following:
Only the veins and not the arteries are provided with valves.
Describe, in brief, the circulatory system in human beings.
Find the odd one out, giving reason.
______ WBCs are present per mm3 of blood.
Assertion (A): RBCs help in the transport of respiratory gases.
Reason (R): The cytoplasm of RBCs contains the respiratory pigment Haemoglobin.
Name the following:
The structure that holds the heart valves in position.
