Lab 2: Blood Projections

Question 1

Answer 1

Neutrophil (man)

Characteristics: 60-70% circulating leukocytes, divided in two to five segments or lobes; light staining

Functions: Phagocytosis of foreign cells, toxins, and viruses; involved in bacterial infections

Question 2

Answer 2

Monocyte

Characteristics: 3-8% of circulating leukocytes. Kidney-shaped or horseshoe-shaped nucleus.

Functions: Migrate into tissues, where they become macrophages and serve in phagocytosis of foreign particles such as viruses and bacteria.

Question 3

Answer 3

Blood film (man)

Characteristics: Contains formed elements–erythrocytes (RBC-red blood cell), platelets, leukocytes (WBC-white blood cell); also plasma

Function: Transport of gases (oxygen and carbon dioxide), ions, proteins, and lipids among other things

Question 4

Answer 4

Basophil (man)

Characteristics: 0.5-1% of circulating leukocytes (least numerous of all leukocytes). Nuclei stain dark purple, numerous dark granules may sometimes mask the nucleus.

Function: A role in allergic responses. Granules contain histamines (vasodialators) and heparin (anticoagulant).

Question 5

Answer 5

Small lymphocyte (man)

Characteristics: large dark purple-staining nucleus with thin rim of pale blue cytoplasm; accounts for 25-35% of circulating leukocytes

Functions: B-cells involved in humoral immunity and produce antibodies; T-cells involved in cell-mediated immunity to destroy foreign cells.

Question 6

Answer 6

Eosinophil (man)

Characteristics: Constitutes 2-4% of circulating leukocytes. Bilobed nucleus, reddish-orange granules.

Function: Effective against parasitic-worm infections; involved in allergic reactions.

Question 7

Answer 7

Neutrophil w/ drumstick

Characteristics: Small lobe protrudes from the nucleus, known as “drumstick.” It represents the inactive sex chromosome of the cell (Barr body)

Location: Found solely in females

Question 8

Answer 8

Large Lymphocyte

Characteristics: More abundant and basophilic cytoplasm than small lymphocytes; also cytotoxic or natual killer cells; may function in absence of antibodies

Functions: Destroy tissue grafts, tumor cells, and cell infected with viruses through production of perforins