(1) Myogenic mechanisms involved in autoregulation of blood flow are activated b
ID: 83241 • Letter: #
Question
(1) Myogenic mechanisms involved in autoregulation of blood flow are activated by:
a) generation of local vasoactive substances.
b) altered intra-luminal blood pressure.
c) endothelium-derived vasoactive factors.
d) the [K+] in surrounding tissue.
e) the [O2] in surrounding tissue.
(2) According to the Starling Equation, which ONE of the following would NOT be a factor in the net filtration pressure controlling the movement of water across the capillary wall?
a) Hydrostatic (blood) pressure in the capillary.
b) The concentration of Na+ in the interstitial fluid.
c) The interstitial fluid pressure.
d) The number and size of the pores in the capillary wall.
e) The plasma protein concentration.
(3) The major mechanism controlling the diameter of arteries in the skin is:
extracellular CO2 concentration
myogenic
extracellular K+ concentration
lympathetic nerve activity
accumulation of metabolic waste products
Closure the aortic valve is aascciated with al of the folowng except: Select one the second heart sound. O dicrotic notch on the acrtic pressure wave. T wave of the ECG rapid ng of the left ventricle relaxation of the ventricle. The firing rate of acrtic bat rcreceptors is increased by Select one. decreased blood oxygen concentration. O decreased blood pressure. creased blood oxygen concentration O activaticn of receptors n the right atnum. increased blood pressure. The repolarisation of pacemaker cells is due in part to: Select one: O an increase in the permeability of calcium. a decrease in the permeability of sodium. n the permeability of potassium. in the permeability of potassium an increase in the permeability of scdium The volume reflex, in which heart rate and renal blood flow are increased following an increase in blocd volume, is medieted primarily by. Select one: atrial and vena cava baroneceptors o peripheral chemoreceptors O a combination of atrial and vena cava baroreceptors, aortic baroreceptors and carctid sinus baroreceptors aartic bara receptors carotid sinus baroreceptors Which ONE of the following is NCORRECT regarding the mechanism by which the s moves across the wall of a capillary? Select one: Net water transport depends upon net hydraulic filtration pressure Glucose is carried across the wall by plasma filtration. O Urea diffuses across the wall down its concentrati gradient on O oxygen permeation is more than 1000 tmes faster than glucose pemeation. O Respiratory gases permeate rapidly, because they are ipid scluble,Explanation / Answer
1. Myogenic mechanisms are the process that takes place n response to the increase and decrease of blood pressure to maintain the flow of blood into the vessels constant. so the correct option is B that is the altered intra-luminal blood pressure.
2. The sterling equation describes the filtration and absorption of the fluid in the capillary. The net filtration presuure is the balance between the four sterling forces and which determines the flow of fluid across the membrane of a capillary. The four forces include the Oncotic pressure of the plasma protein, hydrostatic pressure, interstitial fluid pressure and the osmotic pressure of the plasma in the blood or in the fluid. so the correct option is the d The size and pores in the wall of the capillary.
3. The correct option is the Lymphatic nerve activity which causes the constriction and dilation of the arteries.
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