### body part | organ | gland:

Endocrine gland
* Most endocrine glands regulate levels
  - release hormones
* are a group of glands in the body which secrete hormones
  - part of endocrine systems
  - small and are located throughout the body
  - tones, promoting psychological and physical health
  - very important despite their small size since they make important hormones
* can release chemical messages, as well.
* have liberal blood supplies to help distribute released hormones.
* lack ducts and so secrete their hormones directly into the blood.
* produce and regulate levels of hormones in the blood
  - hormones and are secrete directly into the blood or fluid around cells
  - more hormones
* release chemicals into the blood which tell parts of the body to do certain jobs
* secrete chemical substances
  - products

Exocrine gland
* are glands that retain ducts to body surfaces
  - numerous
* look like rings of cuboidal or columnar epithelium, grouped together.
* produce secretions onto epithelial surfaces, usually the linings of ducts.
* secrete through ducts or directly onto an epithelial surface.

### body part | organ | gland:

Gonad
* Some gonads have bases
  - ectoderms
  - outer ectoderms
* also make reproductive hormones.
* are a tribe of wandering desert people
  - consistent with genotype but external genitalia is opposite
  - conspicuous in specimens captured during or just prior to the reproductive season
  - gasrtodermal
  - only prevalent during the reproductive period
  - organs which produce sex cells
  - responsible for producing the ova and sperm
  - testes and ovaries
  - the reproductive glands that produce sperm in males and eggs in females
* are, in fact, internal lying into the gastric pouches but they are visible externally.
* begin differentiation into ovaries or testes by the seventh week after fertilization.
* develop in the lining of the digestive cavity
  - on mature polyps
* includes corpi
  - lobes
* lie near the stomach.
* release eggs or sperm into the water and the fertilized eggs develop into planulae.
  - sex hormones

### body part | organ | gland | gonad:

Testis
* Most testes are connected by ducts
  - sperm ducts
  - contain tubules
* Most testes produce hormone testosterone
  - male hormones
  - synthesize testosterone
* Testes are also involved in the creation and secretion of some steroid hormones
  - composed of bundles of tubules in which sperm are produced and mature
  - often small or cryptorchid
  - present inside a fibrous covering called scrotum or scrotal sac
* Testes are small and buried in the bottom of the vesicles
  - there tendency toward androgen deficiency
  - begin as retroperitoneal structures in the posterior abdominal wall
* Testes can be round to highly branched depending on species
  - function without nerve supply
  - overheat when a man wears brief underwear
* Testes contain numerous seminiferous tubules where sperm develop
* Testes develop earlier than ovaries
  - prior to ovaries
  - enlarge markedly and sperm develop tails during the last month before spawning
* Testes includes corpi
  - epididymises
  - increase dramatically in size during the breeding season
  - lie outside the body in the scortum because they can produce sperms in a cooler environment
  - normally descend from the abdomen into the scrotum at birth
* Testes produce and secrete the steroid hormone testosterone
* Testes produce testosterone , and ovaries produce estrogen and progesterone
  - and ovaries produce oestrogen hormones
  - secrete fluid
* are gonads.
* sex organ

Intestinal gland
* Some intestinal glands consist of follicles.
* are present in the inner lining of small intestine.