Chapter 20 - Cardiovascular System
How many red blood cells normally fit across the diameter of a capillary?
1
Collateral pathway
Anastomosis
An abnormal bulge in an artery is called a/
Anuerism
Little capacitancy
Arteries
Maintain pressure resivor to get blood to capillaries
Arteries
Take blood away from the heart
Arteries
Small, stays the same in the arteria, gets smaller as they branch, last chance to decade blood flow
Arteriole arteries
3 layers
Artery
High pressure
Artery
No Skeletal Muscle Pump
Artery
No valves
Artery
Small lumen
Artery
Thick wall
Artery
Veins are:
Capactiance vessels
1 layer thick - Simple Squamous Epithelial - Exchange
Capillaries
Exchange, 3 types
Capillaries
What has the biggest volume of: arteries, veins, or capillaries
Capillaries
Feeds tissues, there for exchange
Continuous Capillaries
In a blood pressure measurement of 110/70, the number 70 is th
Disatolic pressure
Pressure resivoirs, stretchy, distributors
Elastic arteries
3 layers of arteries:
Elastic, muscular, arteriole
Filters (little holes) kidneys
Fenestrated
Lumen
Hollow place or opening
Intima
Inner most layer, living in the blood vessel - Simple Squamous Ephitelial
Let plasma out
Intercellular clefts
Tunica
Layers of the vein and arteries - Simple Squamous Epithelial
Media
Middle layer - Smooth Muscle Layer
Exits, less stretchy, thicker terica, distributing
Muscular arteries
Do capillary bodies have blood in them?
No
Blood vessels are
Organs
Externa
Outer most layer - Connective Tissue - Blood supply
Provide blood to tissues for exchange
Perfusion Capillaries
Every place where the metarteriole branches to a capillary
Precapillary sphincter
Lets cells or big things cross (big holes), red bone marrow
Sinusoid (Discontinous sinusoid)
How the blood moves in the veins
Skeletal muscle pump
Gets through capillary beds and lets blood flow
Thouroughfare Channgel
The widening of a vessel is calle
Vasodilation
Big capacitancy
Vein
Big lumen
Vein
Low pressure
Vein
Skeletal Muscle Pump
Vein
Thin wall
Vein
3 layers
Veins
At any one moment most of the bodies blood volume is in the
Veins
Capacity, hold blood
Veins
Carry blood to the heart
Veins
Majority of blood is in: capillaries, veins, or arteries?
Veins
Valves
Veins
Start after capillaries
Venule
Which of the following is associated with veins but not arteries?
a tunica media with abundant elastic fibers
Nervi vasorum control
both vasoconstriction and vasodilation
What are the vessels called that are the functional unit of the circulatory system because all exchange takes place here?
capillaries
These vessels contain large amounts of elastic tissue within the tunica media. What are they called?
elastic arteries
Closer to the heart, arteries would be expected to have a higher percentage of
elastic fibers
Which of the following is associated with arteries but not veins?
external elastic membrane
An especially leaky type of capillary found in the liver and certain other tissues is called a
sinusoid capillary
Which layer of the vessel wall facilitates vasoconstriction and vasodilation?
tunica media
What are the vessels called that are thin-walled and expand easily?
veins
