Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
37 Cards in this Set
- Front
- Back
Intima contains?
|
Endothelium only
|
|
What are the functions of the intima? (4)
|
1. Physical & biochemical barrier
2. Hemostasis 3. Angiogenesis 4. Release vasoactive substances |
|
Media contains? (3)
|
1. Smooth muscle
2. Collagen 3. Elastin |
|
Function of smooth muscle in media?
|
Main contractile element
|
|
Function of collagen in media?
|
Adds rigidity to vessel walls
|
|
Function of elastin?
|
Stores mechanical energy
|
|
Adventitia contains ? (2)
|
1. Collagen
2. Elastin |
|
Perivascular nerves are found between which 2 layers in vessels?
|
Between media & adventitia
|
|
Which type of vessels have smallest cross sectional area?
|
Aorta & Large arteries
|
|
Composition of aorta & large arteries?
|
High elastin & collagen (thick adventitia)
Low smooth muscle (thin media) |
|
Function of aorta & large arteries? (3)
|
1. Windkessel Function (pressure capacitance)
2. Reduce heart work 3. Viscoelasticity- pulse pressure & arteriosclerosis |
|
Composition of small arteries?
|
Moderate content of elastin & collagen
Moderate content of smooth muscle |
|
Function of small arteries? (2)
|
1. Pressure capacitance
2. Minor resistance changes (distribute blood) |
|
Composition of arterioles & precapillary sphincters?
|
Low elastin & collagen
High smooth muscle |
|
Function of arteioles & precapillary sphincters?
|
1. Regulate hydaulic resistance
2. Produce greatest pressure drop |
|
Largest cross sectional area of vessels?
|
Capillaries
|
|
Composition of capillaries?
|
Endothelium ONLY
|
|
Function of capillaries? (2)
|
1. Regulate tissue fluid & gas exchange
2. Retain protein w/ in vascular compartment |
|
Composition of venules?
|
Collagen
Little elastin & smooth muscle |
|
Function of venules?
|
Volume capacitance
|
|
Composition of small veins?
|
Low elastin & collagen
Low smooth muscle |
|
Function of small veins? (2)
|
1. Volume capacitance (2/3 of blood volume)
2. Regulation of circulating volume |
|
Composition of large veins?
|
Moderate elastin & collagen
Low smooth muscle |
|
Function of large veins? (2)
|
1. Some volume capacitance
2. Skeletal muscle pump (venous valves) |
|
How does elastin influence compliance?
|
HIGH ELASTIN --> INCREASES COMPLIANCE
|
|
How does arteriosclerosis affect compliance?
|
Arteriosclerosis DECREASES compliance
|
|
What is pulse pressure?
|
Pulse pressure =
Systolic - Diastolic |
|
What is compliance?
|
Compliance =
Stroke volume/ pulse pressure |
|
What is flow?
|
Flow =
Velocity x Cross sectional area |
|
Total flow is = to?
|
Total flow = Cardiac output =
Heart rate x Stroke volume |
|
What is resistance?
|
Resistance =
Pressure/ Flow |
|
Largest volume contained in which vessels?
|
Small veins
|
|
Smallest volume in which vessels?
|
Arterioles
|
|
Greatest velocity in which vessels?
|
Aorta & large arteries
|
|
Lowest velocity in which vessels?
|
Capillaries
|
|
Greatest pressure in which vessels?
|
Aorta & large arteries
|
|
Lowest pressure in which vessels?
|
vena cava
|