T lymphocytes mature in the thyroid gland

All T cells secrete cytotoxic materials

T cells respond to proteins on the surface of host cells

T cells secrete IgG when they are activated.

Tissue swelling is the first stage of the inflammatory response

Mast cells secrete chemotactic agents that attract lymphocytes

Macrophages secrete vasoactive materials during the inflammatory response

The inflammatory response can be triggered by antibody binding to the surface of micro-organisms.

Transporting nutrients and oxygen to tissues

Regulation of temperature, fluid, electrolytes, and pH balance

Production, maintenance, and distribution of lymphocytes

Removal of carbon dioxide and waste products from tissues

Satellite viruses

Gemini viruses

Prions

Viroids

Amoxicillin

Penicillin G

Piperacillin

Cloxacillin

April 2

April 7

May 1

June 5

IgG

IgE

IgM

IgA

Early stage of HIV infection

Advanced stage of HIV infection

Both early and advanced stages

In the middle stages of HIV infection

Male circumcision is associated with a lower risk of HIV infection among men

Use of oral contraceptives is associated with increased risk of HIV infection

Adolescent girls are less susceptible to infection than other aged women

Oral sex is much less efficient mode of transmission of HIV than is receptive anal
intercourse

Neutrophils only destroy bacteria circulating in the blood

Macrophages use nitrous oxide to kill bacteria they have engulfed

Complement kills bacteria prior to their uptake by phagocytes.

The monocytes of the blood are the precursors of tissue macrophages.