Physiology Flashcards
The following is NOT true of simple diffusion
A.Occurs down a electrochemical gradient
B.Does not reqiuire metabolic energy and therefore is passive
C.It is more rapid than facilitated diffusion
D.It does not exhibit stereospecifity, saturation and competition
E.None of the above
e
Which of the following is an example of secondary active trasnport?
A.Na-K-ATPase in cell membranes B.SERCA in the sarcoplasmic reticulum C.Proton Pump in gastric parietal cells D.Na-K-2Cl in the renal thick ascending limb E.Both A and D
d
Factors that increase permeability across the cell membrane *
A.↓ Oil/water coefficient B.↓ Radius of the solute C.↓ Membrane thickness D.Only B and C E.All of the above
d
The action of Tubocurarine on neuromuscular transmission
A.Blocks release of ACh from presynaptic terminals
B.Competes with ACh for receptors on motor end plate
C.Inhibiits acetylcholinesterase
D.Blocks reuptake of choline into presynaptic teminal
E.None of the above
d
It is an inhibitory neurotransmitter found primarily in the spinal cord and brain stem. *
A.GABA B.Glycine C.Nitirc Oxide D.Sertonin E.Glutatmate
a
Accumulation of which solute in intracellular fluid is responsible for the sustained contraction of a skeletal muscle fiber
A.Ca2+ B.Na+ C.Cl- D.K+ E.Mg2+
b
The following describe an action potential. EXCEPT
A. Exhibited by excitable cells only B. Stereotypical size and shape C. Propogating D. All-or-none E. none of the above
e
Which of the following is a sympathetic response, but is mediated by a muscarinic receptor?
A. Ejaculation B. Erection C. Sweating D. Constrict bladder sphincter E. Relax bladder wall
c
The follwoing statement best describes the basilar membrane of the organ of Corti
A.The base responds better to low frequencies that the apex does.
B.The apex is wider than the base
C.The apex is relatively stiff compared to the base
D.The base is more compliant than the apex
E.High frequencies produce maximal displacement of the basilar membrane near the helicomtrema
a
Which of the following vessel have the largest total cross-sectional and surface area?
A.Arteries B.Arterioles C.Capillaries D.Veins E.Venules
d
Stroke Volume is
A.Amount of of blood pumped per heart beat
B.Amount of blood pumped by the heart per unit time
C.Number of heartbeats per minute
D.Force of exerted by the blood against the blood vessel wall
E.Pressure at the level of the arteries and arterioles that opposes the blood coming out of the heart
a
Not present in the SA node action potential
A.Phase 0- upstroke of the action potential
B.Phase 1- initial repolarization
C.Phase 2- plateau of the action potential
D.Phase 3- repolarization
E. Both B and C
c
Which of the following corresponds with slow ventricular ejection
A.P wave B.QRS complex C.closure of AV valves D.T wave E.closure of semilunar valves
d
The volume of the lungs that does no participate in gas exchange
A.Tidal volume B.Inspiratory reserve volume C.Expiratory reserve volume D.Physiologic dead space E.Functional residual capacity
d
The following factors shift the hemoglobin -O2 dissociation curve to the right. EXCEPT *
A.Increased P50 B.Increase in pH C.Increase in temperature D.Increased 2,3-DPG concentration. E.None of the above
d
