Blood

Question 1

Erythrocytes: Shape and Diameter

Answer 1

Biconcave Disk. 7.8 um (micrometer)

Question 2

B- thalassemia is ….

Answer 2

decreased or absent B (Beta) chains.

Question 3

What happens to compensate for the lack of beta chains in B-Thalassemia?

Answer 3

Excessive alpha chains are produced but unable to form tetramers. They instead bind to red blood cell membranes and cause memberane

Question 4

How is clot retraction performed?

Answer 4

Platelets pull on fibrin threads.
- trapped platelets release factor XIII stabilizing the fibrin threads
• Edges of damaged vessel are pulled together
• Fibroblasts & endothelial cells repair the blood vessel

Question 5

What occurrences cause each cell to be increased in blood circulation?

Answer 5

➢ neutrophils 60-70%(↑ in acute bacterial infection)
➢ lymphocyte 20-25% (↑ in chronic infection)
➢ monocytes 3 – 8 % (↑ in fungal/viral infection)
➢ eosinophil 2 – 4 % (↑ in parasitic infection)
➢ basophil <1% (↑ in allergic reaction)