GENERAL HISTOLOGY

EPITHELIUM

EPITHELIAL TISSUES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Epithelial tissue is often avascular which means
A
has many blood vessels
B
has no blood vessels
C
has veins but not arteries
D
has only capillaries
Explanation: 

Detailed explanation-1: -What is Avascular Tissue? Tissues that do not contain blood vessels or lymphatic system are referred to as avascular tissues. Examples of avascular tissue include epithelial cells, cornea of the eye and cartilage.

Detailed explanation-2: -Answer and Explanation: Surface epithelial tissues that contain no blood vessels are known as the basement membrane. The basement membrane is a layer above the epithelium which allows for the passage of various solutes and substances through their membrane by becoming selectivity permeable.

Detailed explanation-3: -Epithelial tissue does not contain blood vessels to prevent bleeding because this tissue is constantly exposed to mechanical and chemical wear and tear.

Detailed explanation-4: -Epithelial tissues do not contain blood vessels and as such are avascular. Connective tissues are usually highly vascular and so the nearby connective tissue provides essential nutrients (from the blood) to the epithelial tissue.

Detailed explanation-5: -Epithelial tissue is avascular, meaning that it does not have blood vessels directly supplying the tissues with nutrients. Instead, the cells and tissues below the epithelial tissue act as a relay for the nutrients.

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