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Physiology

Chapter 14

QuestionAnswer
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