Eppithelial Cells

Question 1

Give a location of Simple Cuboidal Epithelial Cells and its function in that area.

Answer 1

Thyroid follicles - Hormone synthesis, storage and mobilisation
Small ducts (exocrine) - Absorption and conduit
Kidney Tubules - Absorption and Secretion
Surface of Ovary - Barrier

Question 2

Give a location and function of Simpler Columnar Epithelial Cells.

Answer 2

Stomach lining and Gastric Glands - Secretion
Small intestine and colon - Absorption, secretion and lubrication
Gallbladder - Absorption
Oviducts - Transport

Question 3

Give a location and function of Pseudo-Stratified Epithelial Cells.

Answer 3

Respiratory Tract - secretion, conduit, mucus secretion (goblet cells) and particle removing
epididymus ductus deferens - secretion and conduit

Question 4

Why can Pseudo-Stratified Epithelial cells be hard to recognise?

Answer 4

Because not all cells reach the top of the epithelial lining they can be confused for stratified cells

Question 5

Give a location and function of Stratified Squaemus Epithelial cells.

Answer 5

Oral cavity, oesophagus, larynx, vagina, part of anal canal, surface of cornea and inner surface of eyelid - protection against abrasion and prevents water loss but remains moist

Question 6

What specialised version exists of simple columnar epithelial cells and how is it specialised for its function?

Answer 6

Microvilli adaptation - increases surface area hugely without increase tissue use as much, mainly used in GI tract for absorption stages

Question 7

What adaptation of stratified squaemus cells exists and why is it useful?

Answer 7

Keratinised - an extra few layers of dead epithelial cells on top of the living ones as barriers to protect the living cells from abrasion, UV damage, water loss and also the ingress of bacteria

Question 8

Where are transitional stratified cells usually located and what is their function?

Answer 8

They are usually found in the urinary system as the epithelial cells can stretch and relax to accommodate different fluid levels in the bladder - Distensibility and they protect underlying tissue from damage

Question 9

How can epithelial tissue be described as simple?

Answer 9

As all cells in that layer are in contact with the basement membrane

Question 10

Give 1 location of Simple Squaemus Epithelial Cells and its function in that location.

Answer 10

Blood/Lymph vessels - Active transport by Pinocytosis
Body Cavity Lining (pericardium/pleura/peritoneum) - Lubrication OR Active transport by Pinocytosis
Respiratory Epithelium - Gas Exchange
Bowman’s Capsule - Barrier