Recall how epithelial cell shape is related to its function. What are the shapes

Question

Recall how epithelial cell shape is related to its function. What are the shapes of Type I and Type ll cells and how does the shape related to the function? Both are squamous because they are in the respiratory zone but Type I cells are secretory and Type ll cells are involved in gas exchange. Type I cells are cuboidal becuase they are secretory and Type II cells are squamous because they are involved in gas exchange. Both are squamous because they are both involved in gas exchange. Type I cells are squamous because they are involved in gas exchange and Type Il cells are cuboidal because they are secretory. Both are squamous because they are in the respiratory zone but Type I cells are involved in gas exchange and Type ll cells are secretory

Explanation / Answer

Epithelial cells are classified into two types

2. Stratified epithelium; Multilayered epithelium ,found where body parts should withstand the mechanical and chemical stress

The main functions of epithelium are of following

Outer most layer of skin, inner layer of mouth, oesophagus and vagina

Sweat glands, mammory glands, Salivary glands

TYPE 1 ALVEOLAR CELLS

TYPE II ALVEOLAR CELLS

Here the assumption 4 follows, because

the type 1 cells are squamous they are involved in gas exchange whereas type2 cells are cuboidal in shape so they are secretory.

CELLS SHAPE LOCATION SIMPLE SQUAMOUS EPITHELIUM

1. The cells are thin flat
2. So the areas with passive diffusion of gases have this epithelium

skin, capillary wall,glomeruli, pericardial lining SIMPLE CUBOIDAL EPITHELIUM

1. Cells with equal breadth and height and centrally placed nuclei and spherical in nature
2. It contains cytoplasm having more endoplasmic reticulum and mitochondria
3. Due to this structure its primary responsibilty is secrete, absorb and excretory functions

Ovaries, renal tubule wall, seminiferous tubule,pancreas, salivary glands SIMPLE COLUMNAR EPITHELIUM

1. Here the height of the cells exceeds the width with tightly packed columnar cells
2. Apical surface face lumen and opposite surface on basement membrane
3. It is adapted for secretion, absorption and protection

Uterine tubes, digestive tract PSEUDOSTRATIFIED EPITHELIAL CELLS

1. Due to its flase nuclei the epithelium represents a false impression that the cells are in many layers
2. Tall and thin cells
3. Due to tall cells it represented as respiratory epithelium

Ciliated tissue lines of trachea, nasal cavity, bhronchi, STRATIFIED SQUAMOUS EPITHELIM

1. These are flattened epithelial cells arranged in a basal membrane by adhering one to another
2. Because of the specialised nature its functions are suited in the areas of body having constant abrasion

Outer most layer of skin, inner layer of mouth, oesophagus and vagina

STRATIFIED CUBOIDAL EPITHELIAL CELLS

1. Composed of cube cells which only present in the upper layer of the cells
2. They protect the areas of ducts

Sweat glands, mammory glands, Salivary glands

STRATIFIED COLUMNAR EPITHELIAL CELLS

1. Which is a rare type with coumn cells
2. Secretion and protection are the main functions

Conjuctiva, Pharynx, Uterus, TRANSITIONAL EPITHELIUM

1. Epithelial cells which can contract and relax in nature
2. When the organ is filled with fluid, cellson the topmost layer can stretch and becomes flattened.

Urothelium, renal pelvis,Prostate duct

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