Leukocytes

Question 1

Function of leukocytes

Answer 1

defense against disease

Question 2

Structure of leukocytes

Answer 2

Complete cells, with a nucleus and organelles

Question 3

List the WBC from most to least abundant

Answer 3

▪ Neutrophils
▪ Lymphocytes
▪ Monocytes
▪ Eosinophils
▪ Basophils

Question 4

Desc granulocytes (type of leukocytes)

Answer 4

contain granules in cytoplasm
lobed nuclei

Include neutrophils, eosinophils and basophils

Question 5

Desc Agranulocytes (type of leukocytes)

Answer 5

Lack of cytoplasmic granules

Nuclei are kidney-shaped

Include lymphocytes and monocytes

Question 6

Leukopoiesis (production of WBC) are stimulated by which chemical messengers

Answer 6

▪ Interleukins (e.g., IL-3, IL-5)

▪ Colony-stimulating factors (CSFs)

Question 7

which stem cell gives rise to lymphocytes

Answer 7

Lymphoid stem cell

Question 8

which stem cell gives rise to other lineages

Answer 8

Myeloid stem cell

Question 9

which WBC FORM PARTIALLY in bone marrow

Answer 9

granulocytes and monocytes

Question 10

which WBC FORM PARTIALLY in lymph tissue

Answer 10

lymphocytes and plasma cells

Question 11

shape of granulocytes

Answer 11

Band-shaped

Question 12

Neutrophils features and function

Answer 12

Size
▪ Twice as large as erythrocytes

Function
▪ Act as phagocytes at active sites of infection

3 to 6 lobes of nuclei

Question 13

Eosinophils features and function

Answer 13

almost same size with neutrophils

Bilobed (purple) nucleus

Functions
▪ fight against parasitic infections
▪ Response to allergies and asthma
▪ Increase in reaction to cancer and certain drugs

Question 14

Basophils features and function

Answer 14

Deep purple nucleus large basophilic granules

Function
Initiate inflammation

Histamine: inflammatory chemical that acts as vasodilator to attract WBCs to inflamed sites

Release histamine in allergic reaction

Question 15

Lymphocytes feature and function

Answer 15

Large, dark-purple, spherical nuclei

Thin rim of pale-blue cytoplasm

Function:
▪ T lymphocytes- attack virus-infected cells and tumour cells
▪ B lymphocytes- give rise to plasma cells, producing antibodies

Question 16

Monocytes feature and function

Answer 16

Dark-purple nucleus in U or kidney shaped and pale-blue cytoplasm

Function of monocytes
▪ Leave circulation, enter tissues, and differentiate into macrophages
▪ Activate lymphocytes to mount an immune response

Question 17

formation of leukocyte

Answer 17

Hematopoietic stem cells differentiate into lymphoid cell in the bone marrow and lymphoid cell develop into different types of white blood cells, like neutrophils, lymphocytes, monocytes, eosinophils, and basophils. These white blood cells help the body fight infections and keep us healthy by defending against germs