Tissues, Organs And Systems Flashcards

1
Q

What holds cells together?

A

Cell-cell adhesion molecules, extracellular matrix proteins, internal-external scaffolding and close proximity (pressure effects).

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2
Q

What’s the role of tight junctions?

A

To prevent movement of larger molecules through the outer layer into the deeper tissue layers of the organ.

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3
Q

Role of desmosomes and where they are found.

A

To provide mechanical strength and prevent tissue destruction. Found in tissues that experience intense mechanical strength (e.g. cardiac muscle) and is the only cell-cell adhesion found in upper epidermal cells.

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4
Q

Function of gap junctions.

A

To quickly communicate changes in intercellular molecular composition, e.g. electrolyte and energy changes. Important in smooth muscle contraction.

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5
Q

Location and role of hemi-desmosome.

A

Only found on basal surface of epithelial cells. It’s role is to anchor epithelial cells to the basal lamina and prevent loss to external surface.

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6
Q

Describe adherence of epithelial cells.

A

Adhere to epithelial cells through cell surface proteins, adhere to basal lamina through cellular adhesion molecules, adhere to muscle cells through connective tissue fibres.

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7
Q

What is a mucosal membrane?

A

The moist, inner lining of some organs and body cavities.

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8
Q

What are the functions of the mucosal membrane?

A

Stops pathogens from entering the body, prevents bodily tissues from becoming dehydrated, lubricate the surface.

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9
Q

Function of mucosa in the GI tract.

A

To absorb substances from the lumen, prevent ingress of pathogens, move contents and expel waste.

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