Glands - What Are Glands - Types Of Glands - Merocrine Glands - Apocrine Glands - Holocrine Glands

glands are multicellular organs or

individual cells that secrete substances

for use in the body most glands are made

up of epithelial tissue and their seat

creations include mucin hormones

electrolytes enzymes and waste products

glands can be divided into two groups

endocrine glands and exocrine glands

endocrine glands secrete their products

mainly hormones directly into the

bloodstream or interstitial fluid that

surrounds cells some endocrine glands

include the adrenal thyroid and

pituitary glands exocrine glands

typically see-cret their products into a

duct or onto a surface such as the skin

but not into the bloodstream exocrine

glands can be unicellular or

multicellular unicellular exocrine

glands do not contain ducks and the

multicellular glands do contain a duct

system an example of a unicellular

exocrine gland is the goblet cell which

can be found in epithelial tissue and

secrets mucin which forms a mucous layer

coating certain tissue areas such as the

air passageway in the trachea in the

respiratory system multicellular

exocrine glands can be classified in two

different ways by their form or by their

secretion method let's look at

classification by form there are two

different forms simple glands which have

a single duct and compound glands which

have branching ducts there are also two

different forms of the secretory portion

of the gland tubular where the diameter

of the duct and secretary portion are

similar and a sinner or alveolar where

the secretory portion of the gland forms

a sac like shape so they're simple

straight tubular coiled tubular and

simple branch tubular which still has

only one dock making it a simple gland

and simple a sinner and simple branch to

center again only one duct and for

compound glands with more than one duct

there are compound tubular compound a

sinner and compound to be Lois Center

with both tubular and a sinner regions

now for classification by secretion

method in which there are three basic

types Marek Rhine epoch Rhine and Halle


merocrine glands release their

secretions through the process of

exocytosis where secretory vesicles are

released through the plasma membrane of

the cell without damaging the cell

itself the salivary glands are an

example of merocrine glands a per kraang

glands actually pinch off a portion of

the cell to release their secretory

products the cell repairs itself and

continues to release its products in the

same manner

mammary and some sweat glands are

examples of apricot glands the third

type is holy crying glands in holocrine

glands cells accumulate a secretory

product and the entire cell ruptures to

release the product the ruptured cells

are replaced by other epithelial cells

through cell division

examples of holocrine glands include

certain glands in the skin and in the

eyelids we will cover the structure and

functions of individual glands in future

videos and that be the basics on the

structure and classification of glands