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संबंधित प्रश्न
Give biological reasons for the following statements:
The left ventricle of the heart has a thicker wall than the right ventricle.
The diagram given below represents a section of the human heart. Answer the questions that follow :
(i) Which parts of heart are in the diastolic phase? Give a reason to support your answer.
(ii) Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
(iii) What causes the heart sounds ‘LUBB’ and ‘DUP’?
(iv) Name the blood vessels that supply oxygenated blood to the heart muscles.
(v) Draw neat labelled diagrams of a cross section of an artery and a vein.
What is meant by human circulatory system? Name the organs of the circulatory system in humans.
Given below is a certain structure, write its chief functional activity.
Bone marrow - ______.
what is Lymph nodes?
Cardiac muscles are ______.
Explain the following:
Why is the closed circulatory system more efficient than the open system?
Agranulocytes are about ______ % of total WBCs.
Given below are four statements regarding human blood circulatory system:-
- Arteries are thick walled and have narrow lumen as compared to veins.
- Angina is acute chest pain when the blood circulation to the brain is reduced.
- Persons with blood group AB can donate blood to any person with any blood group under ABO system.
- Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?
Name the following:
Contraction phase of heart.
