Cell Junction, Glands And Membranes

Question 1

Types of Cell Junction and Functions

Answer 1

Tight Junctions - joins tightly to neighboring cells / no substance can pass

Function - prevent digestive juices from seeping between ET cells

Desmosomes - (like a snap on jeans), not continuous therefore substance and pass.

Hemidesmosome - connect ET basement to tissues

Question 2

Exocrine vs Endocrine Glands (function, location)

Answer 2

Exocrine glands maintain their contact with the surface by way of a duct. Located on skin (sweat), liver (bile), breast (milk), tear glands, salivary glands, pancreas

Endocrine glands lose contact with the surface and have no ducts. Have a high density of blood capillaries. Secrete directly into blood. Hormones.

Question 3

Types of Secretions of Exocrine Glands

Answer 3

Serous glands - thin/watery fluid: sweat, milk, tears, digestive juices

Mucous glands (goblet cells) - mucin

Question 4

Merocrine glands secrete what? And how?

Answer 4

Tears, salivary, milk sugar, milk proteins

Exocytosis

Question 5

Aprocine glands secrete what, and how?

Answer 5

Lipids

Fat droplets coalesce and bud off from cytoplasm

Question 6

Holocine secrete what and how?

Answer 6

Oil

Cell accumulates a product then entire cell disintegrates

Question 7

Where is cutaneous membrane located, and what type of connective tissue?

Answer 7

Skin = cutaneous membrane

Composed of Stratified squamous cells (epidermis) resting on connective tissue (dermis)

Question 8

Mucous membrane is located where? What is its histology?

Answer 8

Lines passages that are open to the exterior - digestive, respiratory, urinary, reproductive.

Epithelium —> Lamina propria (Areolar CT) —> Smooth Muscle

Question 9

Serous Membrane is located where? What is its histology?

Answer 9

Produces watery serous fluid - lines inside of body cavity

Simple Squamous —> Araeolar CT

Question 10

endothelium Membrane is located where and composed of what tissues?

Answer 10

Circulatory system - the blood vessels, endocardium of heart

Endothelium —> Areolar CT