### process:

Ejaculation
* Most ejaculation depends on circumstances
  - involves contraction
* Some ejaculation occurs over time.
  * When a man is stimulated, his penis becomes erect. When he has an orgasm, semen comes out from the end of his penis. Semen contains sperm and other substances. How long a man can be stimulated before ejaculating, how long the ejaculation lasts, the strength of the ejaculation, and the amount of semen that comes out, all vary from one man to another. Ejaculation can also happen without control when a man is sleeping. Boys do not ejaculate until they reach puberty.
* allows males to reproduce.
* appears to occur almost throughout the entire duration of copulation.
* discharges the semen from the erect penis.
* generally lasts a few seconds.
* happens to fast.
* increases the serum prostate specific antigen concentration
  - prostate-specific antigen concentration
* is an exclamation
  - inevitable once the prostate hardens
  - rare, and fertility rates are unaffected
* is the climax of sexual excitement, when a man has an erection
  - discharge of semen from the penis
* is the expulsion of semen
  - sperm usually caused by the stimulation of the glans penis
  - forceful expulsion of semen from the penis
  - medical term used for the release of fluid that occurs at orgasm
* is the term for the contractions that release semen
  - used when sperm is forced out of the urethra and the penis
  - thus an inherent, natural, and pleasurable part of male orgasm
* is when semen is pushed from the penis
  - the seminal vesicles and prostate empty
* occurs over an extended period of time
  - with the contraction of the urethra and expulsion of semen
* reflex that, once a certain level of stimulation is reached, is automatic.
* seems to be under voluntary control.
* still occurs, and sex glands continue to function as usual.
* takes places.
* two-part reaction to sexual stimulation.
* usually happens at a different time than orgasm
  - takes place during male masturbation
+ Ejaculation, Men, How it happens in men: Female reproductive system :: Male reproductive system
  * Ejaculation takes place in two stages.
+ Penis, Ejaculation: Anatomy of the male reproductive system
  * Ejaculation is when semen is pushed from the penis. It usually happens during an orgasm. Men can ejaculate during sexual intercourse or by masturbation.

### process | ejaculation:

Female ejaculation
* can occur with or without orgasm, and is very enjoyable.
* is the expelling of fluid from or around the urethra.

Frequent ejaculation
* can lower sperm count.
* causes baldness.
* is needed for healthy sexual function.

Emergency procedure
* are procedures.
* covers bus evacuation in the event of an accident.

Endogenous process
* cause many major landform features.
+ Endogenous and exogenous: Earth sciences
  * They take place mainly along the plate boundaries, which are the zones that lay on the edges of plates. These zones are weak. Endogenous processes cause many major landform features.

Engineering design
* involves interactions of multiple technologies.
* is as critical as the biological needs of the animals
  - the process of devising a system , component or process to meet desired needs

Epistasis
* Some epistasises have shapes.
* biological process
* refers to the effects of one gene overriding the effects of another gene.