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Physiology
Chapter 14
| Question | Answer |
|---|---|
| Viscosity of Fluid | Offers resistance to flow *As viscosity increases, resistance increases |
| Total Peripheral resistance(TPR) | Combined resistance of all BV within systemic circut |
| What does microcirculation include? | Arterioles, capillaries, venules |
| What lines inner layer of BV? | epithelial cells |
| Components of BV walls | Smooth muscle, and connective tissue |
| Arteries | Thick walls& large diameter *Fast blood flow *Storage of pressure * |
| What does pulse pressure tell you? | Elasticity of BV |
| What regulates Arterioles radius | ring of smooth muscle cells *extrinsic |
| What factors regulates the arterioles radius? | Sympathetic ¶symp. nerves, hormones, metabolic activity, change in blood flow, stretch of BV, locally secreted factors |
| Sympathetic nerves role in arterioles | Causes vessel constriction which increases BP |
| Parasympathetic nerves role in arterioles | Doesn't play a huge role |
| Hormones role in arterioles | Epinephrine(neuron transmitter), vasopressin(produces in kidney) angiotensin(vasoconstriction) |
| Metabolic activity role in arterioles | Amount of Co2 & O2 in blood |
| Changes in blood flow role in arterioles | slow blood flow produced more co2 |
| Heat and cold role in arterioles | Heat causes vasodilation cold causes vasoconstriction |
| Capillaries | 5-10 micrometer *thin cell wall *blood velocity if slow |
| net filtration in Capillaries | 3L a day |
| Venules | connect capillaries to veins *little smooth muscle(don't expand much) *some exchange of material between blood and interstital fluid |
| Veins | large diameter & thin walls *volume reservoir(60% of blood there) |
| Valves in veins | only exist in peripheral veins |
| Lymphatic System | system of vessels/ducts that coarses throughout body towards the heart |
| Open System | Returns excessive amount of filtrate to our blood (part of immune system) |
| Lymph node | Like tollway. *watches for everything passing through like cancer cells or bacteria |
| Mean Arterial Pressure (MAP) | MAP=HRxSV(strokevolume)xTPR |
| Baroreceptors | AKA Pressure receptors, stretch receptors *sense pressure in blood |
| 2 major locations of Baroreceptors | 1.Aortic Arch 2.carotid body(artery) |
| Baroreceptor reflex | (-) feedback loop to maintain BP |
Created by:
izis
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