Flashcards
Circulatory Systems VII
Cards in this deck (20)
- 1What is vasomotion?spontaneous oscillation in tone of blood vessel walls, independent of heart beat, innervation or respiration
- 2Microcirculation capillary BVSmall arterioles - smooth muscle w/ symp. innervation.
Term. arterioles - Controlled by local metabolites
Pre-capillary sphincters - 3Diagram of capillary network (6)terminal arteriole
Pre-capillary spincters
metarterioles
true capillaries
thoroughfare channels
postcapillary venule - 4What is a thoroughfare channel?Direct connection of metarteriole to venule (skips capillary)
- 5Function of pericytesStabilise newly formed capillary
Maintain BBB
Regulate cerebral BF at level of individual capillary - 6What does BBB control?Movement of ions/solutes btw. continuous capillaries and choroid plexus
- 7How do they do this?Have TJ which prevent movement of hydrophilic solutes
Specialised transporters which allow controlled movement across capillary wall - 8Tissues that capillary types found inCont. - muscle
Fen. - Endocrine gland
Discontinous - bone marrow - 9Why can CO2/O2 cross continuous cap?As they're lipophilic
- 10Show a diagram of CO2 X in capillariesBicarbonate formation accounts for most of the difference btw. total[CO2] and dissolved [CO2].
- 11What are the four starling forces?cHSP/iHSP
BCOP/ICOP - 12How is bCOP formed?Colloid proteins, especially albumin, insoluble and too large to cross endothelium
Accounts for reabsorption of H2O - 13What happens when edema?Low protein content
BCOP low
Excess fluid drained from cap.
Leads to excess build-up in tissues - 14Describe fluid movement at arterial side of capillarycHSP>> iHSF
cHSP>>BCOP
Net filtration as fluid forced against walls of capillary - 15Why cHSP>> iHSF?Lymphatic vessels constantly drained into subclavian veins of the neck
Low protein content so low HSP - 16What happens at venous side of capillary?BCOP>cHSP
Water drawn in - 17Which is larger, net. filtration or net absorption?Net absorption, as cHSP > BCOP so inevitable that more fluid will be forced out than drawn back in
- 18TranscytosisExocytosis of large lipid insoluble compounds into a lipid vesicle by endothelial cells
- 19Bulk FlowSmall lipid-insoluble solutes in H2O
Direction depends on net filtration pressure derived from 4 Starling Forces - 20What transport do capillaries of BBB use?Transcellular Transport
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- Created by J yadonknow · Apr 25, 2018
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