Physiology Recency C Flashcards
The chloride shift is necessary for transport of CO2 in the form of:
a.Carbamino haemoglobin
b.Soluble gas
c.Plasma NaHCO3
d. H3co3
Plasma NaHCO3
Thyroid hormones alter the effects of epinephrine by:
a.Increasing the number of alpha receptors per cell
b.Decreasing the density of enzymes destroying epinephrine
c.Increasing the activity of enzymes destroying epinephrine
d.Increasing the number of beta receptors per cell
Increasing the number of beta receptors per cell
The theory of muscle contraction involving interaction of actin and myosin is called the:
a.Sliding filament theory
b.Cross bridge theory
c.Continuous filament theory
d.Folding theory
Cross bridge theory
Blockage of sodium-potassium pumps of excitable cells with digitalis derivatives results in:
a.Reduced cell size
b.Increased resting cell membrane potential
c.Depolarization
d.Blockage of all cellular transport
Depolarization
Damage to which part of the nervous system is most likely to produce instant death in an animal?
a.Brachial plexus
b.Brainstem
c.Cerebellum
d.Cerebrum
Cerebrum
Intrinsic cell membrane proteins that serves as ionic pump:
a.Contain an ATPase domain
b.Allow passive diffusion of ions
c.Are fixed in number for a given cell type
d.Maintain a constant rate of ionic transport
Contain an ATPase domain
Co-transport of organic substrates across mammalian cell membrane:
a.Can occur with potassium diffusion
b.Can involve only 2 organic compounds
c.Requires sodium diffusion
d.Must transport only one substrate at a time
Requires sodium diffusion
AFterload to left ventricular contraction is defined as the intraventricular pressure:
a.At the end of systole
b.Required to open the aortic valve
c.At the end of diastole
d.Required to close the left atrioventricular valve
Required to open the aortic valve
Plasma bilirubin is:
a.Made soluble by albumin
b.Excreted unconjugated
c.Converted to biliverdin
d.Water soluble
Made soluble by albumin
To convert ATP to cAMP, adenylate cyclase requires:
a.Calcium
b.Potassium
c.Sodium
d.Magnesium
Magnesium
Monocytes released from the bone marrow have an intravascular half-life of about:
a.3 days
b.2 days
c.1 day
d.12 hours
3 days
Vitamin B12 absorption:
a.Occurs in the duodenum
b.Uses a sodium-linked transport system
c.Requires intrinsic factors
d.Requires bile salts
Requires intrinsic factors
Associated weak acid is ___, while a dissociated weak base is___.
a.Nonionized, ionized
b.Nonionized, nonionized
c.Ionized, Nonionized
d/Ionized, ionized
Ionized, Nonionized
In the equation pH=pK + log U/P, pK is?
a. The dissociation constant of the substance
b.The -log of the dissociation constant
c. The log of the dissociation constant
d.The Henderson factor
The -log of the dissociation constant
The hydrophobic tails of a membrane phospholipid corresponds to the:
a.Fatty acid
b.Glycerol
c.Phosphocholine
d.All of the above
Fatty acid
When Vincristine is used as an anti-cancer drug, it specifically affects the function of this organelle
a.Nucleus
b.Endoplasmic reticulum
c.Microtubule
d.Lysosome
Microtubule
Which of the following may increase the membrane potential?
a.Transport of chloride into the cell
b.Transport of calcium into the cell
c.Inhibition of potassium outflow
d.Inhibition of sodium into the cell
Transport of chloride into the cell
Myelination of a neuroaxon result in this:
a.Reduced length of constant of the axon
b.Increased length
c.Reduced time constant
d.Increased time constant
Increased length
0.15m NaCl is __ the normal osmolality of the plasma
a.Twice
b.Half
c.Three times
d.Equal
Equal
Based on lipid solubility, which one is generally correct?
a.Protonated weak acid>Unprotonated weak base
b.Unprotonated weak acid<protonated weak acid
c.Protonated weak base<Protonated weak acid
d.Unprotonated weak base<Protonated weak acid
Protonated weak base<Protonated weak acid
According to Fick’s law, the rate of diffusion of a substance across the cell membrane is inversely proportional to:
a.Thickness of the membrane
b.Concentration gradient
c.Lipid solubility
d.Membrane fluidity
Thickness of the membrane
Which of the following transport process is mediated by a uniport?
a.Sodium pump
b.Secondary active transport of glucose
c.Bulk flow
d.Na+ diffusion across cell membrane during development of action potential
Na+ diffusion across cell membrane during development of action potential
Chloride shift or Hamburger effect is:
a. An electrogenic process
b.Mediated by a symport
c.Mediated by a uniport
d.Mediated by antiport
Mediated by antiport
A cholagogue drug may not work in this species
a.Sheep
b.Deer
c.Tiger
d.Chicken
Deer
In case of pancreatic enzyme deficiency, this form of triglyceride is most usefully supplemented in the diet of the patient.
a.Short-chain triglycerides
b.Medium-chain triglycerides
c.Long-chain trigylcerides
d.MCT and LCT
Medium-chain triglycerides
This is not a brush border enzyme
a.Invertase
b.Maltase
c.Isomaltase
d.Colipase
Colipase
In post-hepatic jaundice the predominant form of bilirubin in the blood:
a.Conjugated
b.Free
c.Urobilirubin
d.Stercobilin
Conjugated
The end-product pf hemoglobin breakdown in birds that do not form bilirubin is:
a.Cholebilirubin
b.Urobilirubin
c.Lipofuscin
d.Biliverdin
Biliverdin
The endogenous glucocorticoids are Cortisol and?
a. Cortisone
b.Corticosterone
c.Aldosterone
d.Prednisone
Corticosterone
the T tubule in the muscle is an extension of the:
a.Endoplasmic reticulum
b.Plasma membrane
c.Nucleus
d.Golgi apparatus
Endoplasmic reticulum
This substance inhibits impulse transmission in the autonomic ganglia
a.Atropine
b.Nicotine
c.Pentamethonium
d.Decamethonium
Pentamethonium
In the nerve axon, which phase of action potential is caused by the inactivation of the sodium channel?
a.Upstroke
b.Absolute refractory period
c.Downstroke
d.Relative refractory period
Absolute refractory period
All of the following transport processes display saturation (Michaelis-Menten) kinetics except:
a.Na-coupled active transport
b.Primary active transport
c.Facilitated diffusion
d.Simple diffusion
Na-coupled active transport
