(tissues) Epthelial Tissue

Question 1

What are epithelial tissue found? Describe the functions of epithelial tissue.

Answer 1

Epithelial tissue are widespread through the body. They form the covering of all body surfaces, line body cavities and hollow organs and are the major tissues glands.

The person a variety of functions that include protection, secretion, absorption, extraction, filtration, diffusion, and sensory reception.

Simple squamous- airs sacs of lungs
Simple cuboidial epithelium- kidney

Simple columnar - intestine

Pseudostratified columnar epithelium (respiratory tract)

Stratified squamous epithelium- espophangus

Question 2

Epithelial tissue are avascular. What does this mean?

Answer 2

It means that it does not have blood vessels directly supplying the tissues with nutrients.

Question 3

Ecm is found beneath the cells in a structure called the Basement Membrane that has two components/layers. Name these two layers and describe their function

Answer 3

The Basal lamina attaches to the reticular lamina which helped hold it all together

Question 4

The other function of Epthelial tissue are glands - what is a gland?

Answer 4

Glands are made up of Epithelial tissue there are several different types and we break them down into two categories.

Question 5

Glands can be classified either by their shape or by how they release their products. What are the two types of glands and how do they release their products?

Answer 5

Exocrine glands and Endocrine glands. The exocrine glands have ducts that transport the glandular secretions to a specific spot (sweat glands, oil glands, salivary glands, etc.)

The Endocrine glands are ductless and secrete into the bloodstream, making them far more powerful, since the bloodstream goes everywhere. Their secretions are called hormones.

Question 6

What is the benefit of releasing the products in blood by endocrine glands?

Answer 6

Endocrine glands release hormones into the bloodstream. This lets the hormones travel to cells in other parts of the body. The endocrine hormones help control mood, growth and development, the way our organs work, metabolism , and reproduction

Question 7

How are exocrine glands classified (Figure 4.10). Describe the following two methods for secreting products used by exocrine glands (Figure 4.11):
Merocrine secretion
Holocrine secretion
Apocrine secretion

Answer 7

Merocrine (eccrine) Glands – form secretory vesicles in their cells that are released through exocytosis. This is the most common form

Holocrine Glands – form their secretions intracellularly and then rupture to release their contents. These are rare and include the sebaceous glands of the scalp.

Apocrine Glands – form their secretion by pinching off a portion of the plasma membrane. This is also rare and is found in the secretion of lipid droplets in mammary tissue.