Question

1. each type of granulocyte has its own unique appearance. write the cell type by each description.

granulocytes		appearance	photomicrograph
b.		round cell, smooth membrane, medium diameter, 2 - lobed nucleus, stains dark red
c.		round cell, smooth membrane, small diameter, multi - lobed nucleus, stains natural pink
d.		oval cell, spiky irregular membrane, large diameter, regular nucleus, stains dark blue

1. natural killer (nk) cells do not attack foreign invaders directly but still protect the body from disease. describe the role of nk cells in the immune system.

1. each lymphocyte has its own role in the immune system. match the cell with its correct function.

lymphocytes	description
t - cell	b. phagocytize pathogens and dead cells
natural killer cell	c. produce antibodies; involved in humoral immunity
macrophage	d. detect and destroy virus - infected and cancerous cells

1. the immune system has 3 lines of defense against pathogens. summarize them by filling in the table.

description	first line	second line	third line
main job		fight localized pathogens that get past the 1st line
components	e.g. skin, mucous membranes

Explanation:

Question 6

Step1: Match description to monocyte

Round, medium cell, kidney nucleus, dark blue stain = Monocyte

Step2: Match description to eosinophil

Round, medium cell, 2-lobed nucleus, dark red stain = Eosinophil

Step3: Match description to neutrophil

Round, small cell, multi-lobed nucleus, pink stain = Neutrophil

Step4: Match description to basophil

Oval, large cell, spiky membrane, dark blue stain = Basophil

Natural killer (NK) cells are innate immune cells that identify and eliminate host cells that are infected with viruses or have become cancerous (abnormal, altered self-cells). They do this by detecting the absence of normal cell surface markers, triggering cell death in these compromised cells without prior sensitization.

Step1: Match B-cell to function

B-cells produce antibodies for humoral immunity = C

Step2: Match T-cell to function

T-cells regulate immunity, cell-mediated = A

Step3: Match NK cell to function

NK cells kill infected/cancerous cells = D

Step4: Match macrophage to function

Macrophages phagocytize pathogens/dead cells = B

Answer:

A. Monocyte
B. Eosinophil
C. Neutrophil
D. Basophil

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Question 7