20.1c Continuous Capillaries

What are continuous capillaries?

Capillaries where endothelial cells form a continuous lining.

How are endothelial cells arranged in continuous capillaries?

They are connected in a continuous layer.

What connects endothelial cells in continuous capillaries?

Tight junctions.

Do tight junctions in continuous capillaries form a complete seal?

No, they do not form a complete seal.

What are intercellular clefts?

Gaps between endothelial cells in capillary walls.

What is the function of intercellular clefts?

They allow small molecules to pass between cells.

Can large particles pass through continuous capillaries?

No, large particles like cells and proteins cannot pass.

What type of molecules can pass through continuous capillaries?

Small molecules such as glucose.

Why are continuous capillaries selective in permeability?

Because tight junctions limit what can pass through.

Where are continuous capillaries commonly found?

Muscle, skin, lungs, and the central nervous system (CNS).

Why are continuous capillaries important in the CNS?

They help restrict passage of substances to protect the brain.

What is the main characteristic of continuous capillaries?

A continuous endothelial lining with small gaps for limited exchange.

Which type of capillary is the least permeable?

Continuous capillaries.