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Biophysics

Biophysics Bible

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Kartei Details

Karten	406
Lernende	15
Sprache	English
Kategorie	Medizin
Stufe	Universität
Erstellt / Aktualisiert	29.01.2019 / 12.02.2022
Lizenzierung	Keine Angabe
Weblink	https://card2brain.ch/box/20190129_biophysics
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Flip-Modus

1) During a hyperpolarization of the cellular membrane, the bulk (volume) electrolytic in the cytoplasm:

a) Shows excess of negative charges

b) Shows excess of Positive charges

c) Remains electroneutral

d) First it becomes electronegative and then electropositive

e) First it becomes electropositive and then electronegative

2) At the resting membrane potential of a typical neuronal cell, the values of electrical driving forces for potassium and sodium ions are approximately:

a) -20 mv AND 0 mv, RESPECTIVELY

b) -65 m V, 25 mv, respectively

c) 0 mv, 50mv, respectively

d) 20 mv, -120 mv, respectively

e) -90 mv, 50 mv, respectively

3) Considering a continuous flow of and ideal fluid through a cylindrical vessel, indicate how will change the velocity of the fluid flow if the vessel’s radius is increased 3 times (Assume that the pressure indicating the flow does not change):

a) velocity decreases 9 times

b) velocity decreases 3 times

c) Velocity does not change

d) velocity increases 3 times

e) velocity increases 9 times

4) If we measure for the sake of experiment, the aterial blood pressure to a subject in the standing position while the cuff is placed on the calf then the measured values of systolic/diastolic pressures will read:

a) Normal 120/80

b) Markedly lower than normal (by approx. 40Hg both systolic and diastolic)

c) Markedly higher than normal (by approx.. 100Hg both systolic and diastolic)

d) Vein pressure will be higher and arterial pressure will be lower

e) Vein pressure will be lower and arterial pressure will be higher

5) We consider an artificial lipid bilayer to which some non-selective channels (channels permeable equally to anions and cations) were incorporated. The resting potential of this embrace will take the value: (assume that electrolytes surrounding the membrane are physiological, i.e. on one side cytoplasmic and on the other extracellular)

(no correct answer given in the bible)

a) 0 mv

b) -90 mv

c) -65 mv

d) -50 mv

c) 50 mv

6) When a viscous fluid is transported through a cylindrical vessel of constant diameter and under a constant pressure, the fluid velocity:

a) is constant across the entire vessel’s diameter

b) is the largest at the wall and smallest in the center showing exponential (increasing) velocity profile across vessel’s diameter

c) is the smallest close to the wall and the largest in the center showing ex- ponential velocity profile across vessel’s diameter

d) is the smallest close at the wall and the largest in the center showing parabolic velocity profile across vessel’s diameter

e) is the largest close to the wall and the smallest in the center showing parabolic velocity profile across the vessles diameter

7) The diameter of a cylindrical artery transporting a viscous fluid (blood) was reduced due to the growth of an atherosclerotic plaque to 25% of its physiological value. Indicate a true sentence

a) Haemodynamical resistance increased by 25 times

b) Haemodynamical resistance decreased by 1⁄4

c) Haemodynamical resistance increased 4 times

d) Haemodynamical resistance increased more than 100 times

e) Haemodynamical resistance increased 16 times

8) The velocity of propagation of the pulse wave along the arterial vessels is

a) Inversely proportional to the square root of Young’s module and the vessel’s wall thickness

b) Inversely proportional to the square root of the vessel’s wall thickness

c) Proportional to the blood density

d) Proportional tot he square root oft he vessel’s wall thickness

e) Proportional to the frequency of the heart beat