### body part | organ | gland:

Testicle
* Most testicles match in size , but some testicles are much larger or smaller than others.
  * are a type of organ called glands. Like other glands, testicles make 'chemical substances', called hormones that keep the body working. Testicles also make sperm which can join with ova to make new life.
  - abdominal
  - gonads
  - in the scrotum because the temperature there is cooler than it is inside the body
  - interesting devices that overide the brain in most cases
  - largest in polyandrous birds
  - male reproductive organs
  - part of the male body
* are smooth, oval- shaped, and somewhat firm to the touch
  - oval-shaped, and somewhat firm to the touch
  - temperature sensitive sperm factories
* begin to produce sperm.
* descend during breeding season.
* develop in the abdomen of the fetus and then descend into the scrotum after birth.
* drawing up into the scrotum protective reflex and is totally normal.
* function best when they keep their cool.
* have two important jobs in the body.
* make several types of chemical substances.
* originate in the abdomen while the fetus is developing.
* produce sperm and the hormone testosterone.
* sex organ
* shrink and the prostate gland enlarges.
+ Testicle, Function, Making hormones
  * Testicles are a type of organ called glands. The human body has many types of glands. The job of glands within a body is to make 'chemical substances', and put them out into the body's system. A body has lots of different systems that keep it in good working order all the time, and that also provide for a body's special needs. Some of the body's special needs happen when a person gets angry, frightened or sick, or if the person wants to have sexual intercourse. At these times a body uses more of some types of 'chemical substance', so the glands that make them work harder.
  * Testicles make several types of chemical substances. They are not simple chemicals, but are very complicated and very important to life. Making these substances is controlled by the pituitary gland which is a small gland in the brain
  - Function: Anatomy of the male reproductive system :: Glands
  * Testicles have two important jobs in the body. They are part of two of the body's systems, the endocrine system which keeps the body working, and the reproductive system which makes new life

### body part | organ | gland | testicle:

Undescended testicle
* are at increased risk for cancer
  - common in boy babies
  - quite common
  - too warm to produce healthy sperm
* have an increased tendency to grow tumors over descended testicles.
* occurs when the testicle fails to move into the scrotum prior to birth.

Thymus
* Some thymuses are part of bodies
  - necks
* are endocrine glands
  - plants
* can be the epitome of judgement, control, prejudice and rigidity
  - most powerful and influential of all the types
* continues to grow until the time of puberty and then begins to atrophy.
* includes corpi
  - lobes
* secrete hormones.

Thyroid
* Most thyroids produce hormones
  - much thyroxine
* Most thyroids produce thyroid hormone thyroxine
  - release growth hormones
  - lobes

Thyroid gland
* Most thyroid glands absorb iodine.
* Most thyroid glands regulate activities
  - development
  - secrete thyroid hormones
* Some thyroid glands are caused by lack
  - consist of lobes
* Some thyroid glands have effects
  - lateral lobes
* Some thyroid glands stimulate protein synthesis
* are brownish-red in color.
* control metabolism.

Gut
* Most guts absorb food
  - nutrients
  - raw food
  - produce enzymes
* Some guts are part of abdomens
  - bellies
* have functions.
  - lobes
* is an organ
* move via smooth muscles.
* serve functions
  - similar functions