Question

The characteristic of simple epithelium is
(a)They are arranged discriminately
(b)They make a definite layer
(c)Continue to divide and help in organ function
(d)None of the above.

Answer 1

Hint: Simple epithelium has only one cell layer. Here, every cell is in direct contact with the underlying basement membrane. The five characteristics of simple epithelium are cellularity, polarity, attachment, vascularity, and regeneration.

Complete answer:
-Due to the presence of the basement membrane, simple epithelium makes a definite layer.
-Simple type of epithelium is found inside the body probably because of its delicate nature.
-Simple epithelium forms the lining of the body cavities, blood and lymph vessels, heart, and respiratory system.
-As the simple epithelium layer is thin in nature, it has the physiological advantage of faster absorption and filtration.
-Due to the ability of simple epithelium, especially is present ]in the lining of the digestive tract and for the exchange surfaces in the lungs.

Additional Information: -There are four types of simple epithelium.
- Simple squamous is present in the blood and lymphatic vessels, air sacs of lungs, lining of the heart. It secrets lubricating substance, allows diffusion and filtration.
-Simple cuboidal is present in the secretory ducts of small glands, kidney tubules which allows secretion and absorption.
-Simple columnar is present in bronchi, uterine tubes, in the uterus as ciliary columnar; digestive tract, and in the bladder as nonciliated columnar epithelium. It allows in absorption, secretes mucus, and enzymes.
-Pseudostratified simple columnar is present in the trachea and most of the upper respiratory tract (ciliated cells) and secretes mucus which moves with cilia.
So, the correct answer is ‘definite layer’.

Note: The epithelial layers contain no blood vessels, so they receive their nourishment via diffusion of substances from the underlying connective tissue called the basement membrane.