Epithelial Tissue

Question 1

Tybes of tissue

Answer 1

1-Connective tissue
2-Epithelial tissue
3-Muscle tissue
4-Nervous tissue

Question 2

General function of the tissues

Answer 2

Epithlial: covering
Connective: support
Muscle: movement
Nervous: control

Question 3

Epithelial tissue

Answer 3

Covers or lines every body surface and body cavity
Epithelium is composed of one or more layers of closely packed cells between two compartments

Question 4

Characteristics of Epithelial tissue

Answer 4

Cellularity: composed almost entirely of cells.
Polarity: has specific top and bottom.
Attachment: basal surface bound to basement membrane.
Avascularity: no blood vessels; recieve nutrients across apical surface or by diffusion.
Innervation: lots of nerve endings
High regeneration capacity: epithelial cells are frequently damaged or lost to abrasion, so they replaced quickly

Question 5

Epithelial tissue surfaces

Answer 5

Apical surface: exposed to external enviroment
Basal surface: attached to underlying connective tissue.
Lateral surface: connected by intercellular junctions

Question 6

Functions of epithelial tissue

Answer 6

Physical protection: protect exposed and internal surfaces from dehydration, abrasion, destruction.
Selective pemeability: act as gatekeepers to let some substances in and keep others out.
Sensation: sense changes in the enviroment.
Some also do secretion: contain glands that release sweat, scents, hormones, etc.