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Heamatology - Lymphatic System Lecture

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Questions and Answers

What is the approximate number of platelets per cubic millimeter of blood?

$150,000 - 400,000/mm^3$ (correct)

$1.5 - 4.0 \times 10^6/mm^3$

$0.15 - 0.4 \times 10^9/mm^3$

$15 - 40 \times 10^4/mm^3$

Which of the following is NOT a component of the central granulomere of platelets?

Beta (β) granules containing mitochondria

Delta (δ) granules containing ADP, ATP, and serotonin

Alpha (α) granules

Rough endoplasmic reticulum (correct)

What is the primary function of the marginal bundles in the peripheral hyalomere of platelets?

Facilitating the open canalicular system

Anchoring the platelet membrane to the cytoskeleton (correct)

Providing a contractile mechanism for clot retraction

Storing calcium ions

Which of the following is NOT a function of blood platelets?

Oxygen transport in the bloodstream Signup and view all the answers

Which of the following granules in platelets store adenosine diphosphate (ADP), adenosine triphosphate (ATP), and serotonin?

Delta (δ) granules Signup and view all the answers

What is the primary function of the irregular tubular system in the peripheral hyalomere of platelets?

Storing calcium ions Signup and view all the answers

Which of the following is responsible for clot retraction in platelets?

Contractile microfilaments Signup and view all the answers

What is the approximate life span of platelets in the human body?

5-10 days Signup and view all the answers

Which of the following conditions is associated with an increase in bleeding time?

Thrombocytopenia (decreased number of platelets) Signup and view all the answers

What is the approximate diameter range of platelets?

2-4 µm Signup and view all the answers