Ch15-blood flow
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- The first priority of blood pressure homeostasis is to maintain adequate perfusion to which two organs?
- Brain and Heart
- Arterioles
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-Their diameter can be altered by neural input.
-Are the main site of variable resistance - Arteries
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-Store pressre generated by the heart.
-Have walls that are both stiff and elastic. - Capillaries
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-Have thin walls of exchange epithelium.
-Blood flow is slowest through these vessels - Veins
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-Carry low oxygen blood
-act as a volume reservoir
-Their diameter can be altered by neural input.
-Have the lowest blood pressure. - Venules
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-Carry low oxygen blood.
-Have thin walls of exchange epithelium. - List the four tissue components of blood vessel walls, in order from inner lining to outer covering.
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1.Endothelium
2.Elastic tissue
3.Smooth Muscle
4. Fiberous Connective tissue - Function of Endothelium
- Where exchange takes place in capillaries and where important paracrines are secreted.
- Function of Elastic Tissue
- Allows the vessel walls to recoil after being stretched
- Function of Smooth Muscle
- Provides resistance to stretch and contraction of vessel.
- Function of Fiberous Connective Tissue
- Provides resistance to stretch.
- Blood flow to individual tissues is regulated by selective vasoconstriction and vasodialation of which vessels?
- Arterioles regulate blood flow to individual tissues.
- The rapid pressure increase that occurs when the left ventricle pushes blood into the aorta can be felt as a pressure wave or ________.
- Pulse
- What is the equation used to calculate the strength of the pressure wave?
- Systolic - Diastolic
- List the factors that aid venous return to the heart.
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-One way valves in the veins
-The skeletal muscle pump
-Low pressure in the thorax during breathing.