Haemostasis
Haemostasis is the physiological process by which bleeding is arrested following damage to a blood vessel wall.
What our notes say
- Haemostasis is the physiological process by which bleeding is arrested following damage to a blood vessel wall. (Haemostasis & Coagulation: Platelet Function & Bleeding Disorders)
- Primary haemostasis — 3-step sequence (essay skeleton): (Year 3: Haematology and Blood Transfusion Pathology)
- Secondary haemostasis — stabilises the platelet plug into a durable fibrin clot. (Year 3: Haematology and Blood Transfusion Pathology)
- TOPIC 14: HAEMOSTASIS IN PREGNANCY & HIV-RELATED HAEMATOLOGY (Acute Leukaemia (AML/ALL) & WBC Disorders: Hematology Guide)
- Step 2 — Primary Haemostasis (Platelet Plug Formation): Platelets adhere to exposed subendothelial collagen via von Willebrand factor, then activate and aggregate to form a loose primary plug. (Haemostasis & Coagulation: Platelet Function & Bleeding Disorders)
- Telangiectasia (HHT) — dilated microvascular swellings; defective haemostasis at lesion sites (Platelet Disorders)
Study material on Haemostasis
- Haemostasis & Coagulation: Platelet Function & Bleeding Disorders
- Haematology paper 1 Past Papers
- hsd haematology
- Haemostasis MCQs: Master Coagulation & Bleeding Control
- Dr. Orata Haematology MCQs: Past Paper Questions & Answers
Practice questions on Haemostasis
What is haemostasis?
- Production of new blood cells
- Process by which bleeding stops
- Normal body condition
- None of the above
Answer: B. Haemostasis is the physiological sequence that arrests bleeding through vasoconstriction, platelet plug, and coagulation. ---
Which is NOT one of the four major physiologic events of haemostasis?
- Fibrinolysis
- Platelet plug formation
- Vasoconstriction
- Coagulation
Answer: A. The four events are: vascular spasm, platelet plug, coagulation, and clot retraction/repair. Fibrinolysis is clot dissolution — a separate process. ---
First step in haemostasis when a blood vessel is injured?
- Platelet plug formation
- Vascular spasm
- Coagulation
- Fibrinolysis
Answer: B. The immediate response to vascular injury is smooth muscle contraction (vasoconstriction) to reduce blood flow. ---
Which is NOT a step in haemostasis?
- Vascular spasm
- Platelet plug formation
- Leukocyte migration
- Coagulation
Answer: C. Leukocyte migration is part of the inflammatory response, not a component of haemostasis. ---
Main role of platelets in haemostasis?
- Oxygen transport
- Plug formation
- Antibody production
- Hormone secretion
Answer: B. Platelets adhere to damaged endothelium, activate, and aggregate to form the primary platelet plug. ---
What is haemostasis? ---
- Production of new blood cells
- Process by which bleeding stops from damaged blood vessels
- Normal body condition
- None of the above Answer:
Answer: A.