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प्रश्न
Name the substance that initiates blood clotting.
उत्तर
Blood platelets play a pivotal role in the clotting of blood. At the site of injury, platelets disintegrate to release a chemical substance thrombokinase which initiates the process of clotting blood.
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संबंधित प्रश्न
The diagrams given below are cross sections of blood vessels:
(i) Identify the blood vessels A, B and C.
(ii) Name the parts labelled 1 to 3.
(iii) Name the type of blood that flows through A.
(iv) Mention one structural difference between A and B.
(v) In which of the above vessels does exchange of gases actually take place?
Name the following:
The phase of the cardiac cycle in which the ventricles get filled with blood from the atrium.
Explain the following:
Why is there no mixing of deoxygenated and oxygenated blood in the human heart normally?
Choose the correct answer:
How much blood is present in an average person?
Given below is a diagram of a smear of human blood. Study the same and answer the question that follow:
Mention two structural differences between the parts labeled 1 and 2.
Explain the Term
Haemopoiesis
WBCs squeeze through the walls of the capillaries into the tissue.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
W.B.C. contains haemoglobin
State the Location: Pulmonary vein
Multiple Choice Questions
The function of WBC is:
