Lec 3 PNUR

Protection

Skin

Tissue

a group of similar cells working

together to perform certain common functions

Types of tissues

Epithelial, connective, muscle, nerve tissues

Epithelial tissues function

Lining, covering, glandular

Connective tissue function

Support

Muscle tissue function

Movement

Nerve tissue function

Control

Connective tissue examples

Fat, soft padding tissue, bones, tendons

Muscle tissue examples

Cardiac, smooth, skeletal muscles

Nervous tissue examples

Brain, spinal cord, nerves

Epithelium tissues

Cells fit closely together and form sheets

Apical surface

Free surface of tissue

Vascularity of epithelium tissues

Avascular

Absorption

Small intestine

Filtration

Kidneys

Excretion

Sweat glands

Secretion

Endocrine glands

Receptor function

Olfactory epithelium

Simple squamous location

Blood and lymphatic vessels

Serous membranes

Alveoli of lungs

Simple squamous Function

Diffusion

Transport

Simple cuboidal location

Glands acini and small ducts

Convoluted tubules and small collecting ducts in kidneys

Simple cuboidal Function

Secretion

Absorption

Protection

Simple columnar location

Glands of stomach, intestine and gall bladder

Large collecting ducts in kidneys

Simple columnar Function

Secretion

Absorption

Ciliated simple columnar location

Respiratory system (small bronchi and paranasal sinuses)

Uterine tubes (uterus, oviducts, ductuli efferentes)

Pseudostratified columnar ciliated location

Trachea

Pseudostratified columnar non-ciliated location

Ducts of male reproductive tubes

Ducts of large glands

Pseudostratified columnar ciliated function

Protection

Secretion

Transport

Stratified squamous keratinized

Skin epidermis

Stratified squamous non-keratinized

Mouth, vagina, cornea, esophagus, female urethra, part of male urethra

Stratified cuboidal

Sweat gland ducts, male urethra

Stratified columnar

Part of male urethra, pharynx

Gland

structure that consists of one ornmore cells that secrete a particular product called secretion

How do we classify glands?

Products release, number of glands

Gland classification where the glands release their products?

Endocrine, exocrine, mixed

Gland classification according to number of cells?

Unicellular, multicellular

Endocrine glands

Ductless, produce and release hormones directly through bloodstream

Endocrine gland example

Thyroid gland

Exocrine glands

Release their products on

the body surface and body

cavities.

Unicellular exocrine glands

Into cavities directly

Exocrine gland example

Salivary glands

Mixed glands

Both endocrine and exocrine functions

Mixed glands examples

Pancreas

Testes

Ovaries

Unicellular glands

Found within the

epithelia along the

intestinal and

respiratory tracts.

Unicellular glands examples

Goblet and mucous cells

Multicellular glands

More complex and

have 2 portions;

epithelial duct and a

secretory unit

Classification of multicellular glands according to complexity of ducts

Simple unbranched, compound branched

Classification of multicellular glands according to mode of secretion

Merocrine, holocrine, apocrine

Examples of multicellular glands merocrine

Sweat and salivary glands

Examples of multicellular glands holocrine

Sebaceous glands

Examples of multicellular glands apocrine

Mammary glands

Multicellular exocrine glands

Into cavities via ducts