Human Tissues

Question 1

Epithelial tissues

Answer 1

It covers external and internal free surfaces.
It has 2 surfaces known as the apical surface and the basal surface.
The apical surface is free while the basal surface is bound to the basement membrane.
No blood or nerve supply to the tissue.
Tissues get nutrients and oxygen from underneath connective tissues.
Functions are secretion, protection and absorption.

Question 2

Types of simple epithelial tissues?

Answer 2

Simple squamous
Simple cuboidal
Simple columnar
Pseudo-stratified columnar

Question 3

Types of compound epithelial tissues?

Answer 3

Stratified squamous
Transitional

Question 4

Simple squamous

Answer 4

This tissue contains plate like cells which are thin and leaky. Found in places where materials exchange through diffusion.
e.g: blood capillaries, alveoli.

Question 5

Simple cuboidal

Answer 5

Composed of dice shaped cells which are specialized for secretion.
e.g: kidney tubules, thyroid gland, salivary gland

Question 6

Simple columnar

Answer 6

Composed of large, brick shaped cells.
Found in places where active absorption and secretion is important e.g: intestinal wall

Question 7

Pseudo-stratified columnar

Answer 7

Cells are not distributed uniformly, nucleus of cells are found at different levels. Usually forms cilliated cells with a mucous membrane, cilliated cells transports the mucous membrane.
e.g: nasal passage, trachea

Question 8

Stratified squamous

Answer 8

This tissue contains different cell layers and they produce new cells rapidly at the basement membrane.
Found in surfaces where abrasion occurs.
e.g: outer skin, lining of the mouth, anus and vagina.

Question 9

Ectoderm differentiates into

Answer 9

Nervous tissue

Question 10

Muscles and connective tissues are originated from

Answer 10

Mesoderm

Question 11

Epithelial tissue originates from

Answer 11

Epithelial tissue can be originated from any of these 3 germ layers

Question 12

Basement membrane of epithelial tissue is mainly composed of

Answer 12

Collagen fibers

Question 13

Main functions of epithelial tissues

Answer 13

Protection (barrier against physical injury, pathogens and fluid loss)
Absorption (respiratory gases, nutrients)
Secretion (enzymes, hormones, mucus and sweat)

Question 14

Transitional epithelium

Answer 14

made up of several layers of cells that become flattened when stretched. It lines most of your urinary tract and allows your bladder to expand.