Question

How can squamous epithelia, which have a high surface area-to-volume ratio, both facilitate diffusion and prevent damage from abrasion?

a. Single layers of squamous epithelia facilitate gas, nutrient or waste exchange, whereas stratified layers provide protection but are not replaceable following damage.
b. Stratified layers of squamous epithelia facilitate gas, nutrient or waste exchange, whereas single layers provide protection and are replaceable following damage.
c. Single layers of squamous epithelia facilitate gas, nutrient or waste exchange whereas stratified layers provide protection and are replaceable following damage.
d. Single layers of squamous epithelia facilitate only exchange of gases by diffusion, whereas stratified layers provide protection and are replaceable following damage

Answer 1

Squamous epithelial cells in a single layer enable diffusion of substances due to their high surface area-to-volume ratio. Stratified layers provide protection against abrasion and are replaceable, facilitating both diffusion and damage prevention.

Step-by-step explanation:

Squamous epithelial cells are designed to provide a balance between facilitating diffusion and offering protection. When these cells are arranged in a single layer, known as simple epithelia, they enable efficient diffusion of gases, nutrients, and wastes. This is because they provide a high surface area relative to their volume, which is essential for tissues such as the alveoli in the lungs, where gas exchange occurs. On the other hand, stratified squamous epithelia, which are composed of multiple layers, are found in body areas that require protection from abrasion such as the skin, mouth, and vagina. These layers provide a robust barrier against environmental damage and can be replaced if they get damaged.

Answer a is correct: Single layers of squamous epithelia facilitate gas, nutrient or waste exchange, whereas stratified layers provide protection but are not replaceable following damage.