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9 Cards in this Set

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  • Back
What are the 4 functions of the peripheral circulation?
1. Carries Blood -bloodflow to tissues

2. Exchange nutrients, waste, gas exchange

3. Transports substances : hormones, immune sys., enzymes

4. Helps regulate blood pressure
Describe continuous capillaries
no gaps

less permeable to large molecules

Has Basement membrane

found in muscles, nervous and many other
Describe fenestrated capillaries
found in intestinal villi, cilliary processes of the eye, choiroid plexuses of CNS, glomeruli (kidneys)
What are sinusoids?
large diameter sinusoidal capillaries with incomplete membrane, clefts and large fenestrations.

found in liver and bone marrow
How do substances diffuse through capillaries?
1. between endothelial cells

2. through fenestrae

3. through the plasma membrane (simple diffusion)

4. Transcytosis (material moved right through a cell via endocytosis then exocytosis )
What are venous sinuses?
Vein with a thin endothelial wall with no smooth muscle to alter diameter. Surrounding dense connective tissue replaces tunica media and tunica externa.
What type of molecules readily diffuse across the plasma membrane?
Lipid soluable - through plasma membrane.

small water soluable - through intercellular crefts or fenestrations.
What are the three layers that make up the structure of arteries and veins?
1. Tunica interna

2. tunica media

3. tunica externa
Describe the tunica interna
Basement Membrane
Internal Elastic Lamina