### agent:

Secret agent
* are agents.
* is an agent

Several agent
* are available to inhibit androgen action
  - specific carcinogens, notably the chemicals contained in tobacco products
* can antagonize the accumulation of acetylcholine.

Software agent
* allow computers to accomplish tasks on behalf of users in an intelligent way.
* are components that migrate around the network doing work on our behalf
  - pieces of code that monitor events and take action in an asynchronous fashion
* are programs that carry out actions on behalf of the user autonomously
  - which autonomously pursue their own agenda

### agent:

Stressor
* also result in changes in immune regulation due to autonomic nervous system reaction.
* are a fact of life
  - any factors or situations that cause stress
  - events and inputs that affect ecosystem function
  - inherent in human existence
* can be physical or emotional, internally or externally generated
  - break down the body making it vulnerable to diseases
  - control physical abilities unless brought under control
  - include being a single-parent household, or having a chronically ill parent or child
* contribute to depression, but people contribute to some stressors.
* introduced by humans include, heavy metals, petrochemicals, and pesticides.
* is an agent
* often result from an individual's reaction to interpersonal conflict.
* threaten the ability of forests to meet the needs of people and society.
+ Psychoneuroimmunology, Link between stress and disease: Immunology :: Psychology
  * Stressors can produce profound health consequences. Kaprio J. Koskenvuo M. and Rita H. 1987. Theorists propose that stressful events trigger cognitive and affective responses which, in turn, induce sympathetic nervous system and endocrine changes. These ultimately impair immune function. Chrousos G.P. and Gold P.W. 1992. The concepts of stress and stress system disorders.

Sunscreen agent
* Some sunscreen agents contain alcohol and are flammable.
* protect hair against damaging UV rays.

Teratogen
* affect the developing embryo or fetus via exposures in the uterus.
  - chemical and physical agents that interfere with normal embryonic development
  - drugs
  - hormones
  - mutation
  - substances that cause birth defects
  - toxins which harm fetal development
* can cause miscarriage or birth defects.
* cause birth defects and mutagens cause inheritable genetic changes.

Toxic agent
* Many toxic agents are in a cigarette.
* Some toxic agents act on the blood or hematopoietic system.
* are the least common cause of food poisoning.
* involved are resinoids and glycosides.

Vasopressor
* are agents that increase systemic vascular resistance by increasing vasocontrition
  - drugs used when a patient's blood pressure falls too low
* help blood flow to the heart so it can be pumped to other organs.

### agent:

Virus
* can infect a range of living organisms
  - remain latent in within the body for many years
  - still circulate after vaccination
  - survive on skin and environmental surfaces
  - then enter the neural tissue causing encephalitis
* replicates in factories at unique locations within the cytoplasm
  - the arthropod tissues, ultimately infecting the salivary glands
  - locally in cells of the ciliated epithelium, causing cell damage and inflammation
* stays circulating in the blood for life.