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at 1 am a researcher places a healthy squid giant axon in a bath of normal squid physiological extracellular saline and internally perfuses the axon
consider an axon of a neuron at timet1 its voltage is at threshold for an action potential at timet2 its voltage is at 0 millivolts prior to the peak
patient x has blood plasma levels of parathyroid hormone pth that are always very high due to a tumor consisting of parathyroid gland cells that
which of the following is true for a g-proteina when an agonist binds to the binding site of a g-protein-coupled receptor gpcr this leads to gdp
which of the following is an effect of the following drugsa drug a is an agonist of the vasopressin2 receptor v2r high levels of drug a in the
sodium-potassium pumpa the net flux of sodium is from a region of high sodium concentration to a region of low sodium concentrationb the net flux of
which of the following is true for the sodium-glucose co-transportera the net flux of sodium ions is from a region of high sodium ion concentration
at 1 am an impermeable membrane separates a 1 liter solution of 2m kcl in the left compartment from a 1 liter solution containing both 1m nacl and 1m
at 1 am an impermeable membrane separates a 1 liter solution of 1m nacl in the left compartment from a 1 liter solution containing both 1m nacl and
consider a properly functioning positive feedback system whose output variable is not equal to plateau at 100 am at 100 ama when the value of
in a properly functioning negative feedback systema value of the controlled variable will always be very close to the threshold value when the system
a new drug named antag-casr has been developed that is an antagonist at calcium-binding sites of casrs calcium-sensing receptors in the plasma
a new drug named agon-casr has been developed that is an agonist at calcium-binding sites of casrs calcium-sensing receptors in plasma membranes of
which of the following serves as an effector or part of an effector that functions in a negative feedback systema 125-dihydroxyvitamin d receptors
which of the following serves as an actuating signal or as part of an actuating signal in a system with feedback either positive feedback or negative
which of the following serves as a sensor or as part of a sensor that functions in a positive feedback systema casrs calcium-sensing receptors
which of the following serves as an effector or as part of an effector that functions in a negative feedback systema nicotinic acetylcholine
which of the following serves as an actuating signal or as part of an actuating signal in a negative feedback systema action potentials in
which of the following is true for active hyperemia a local control mechanism within the circulatory systema there will be an increase in force
the axons of all the baroreceptors in the body were destroyed at 2 am all else is normal which of the following statements is true for the
a decrease in parasympathetic discharge to the heart leads toa a decrease in the conductance of f-channels in sa node cellsb an increase in the
an increase in the calcium conductance of all sarcoplasmic reticulum membranes of a skeletal muscle with no external forces on it leads toa an
for a sarcomere of a skeletal muscle define the following terms a is the length of the a band h is the length of the h zone i is the total length of
illustrate the thin and think filaments in the muscle fibera healthy skeletal muscle fiber is isolated and has no external forces on it it has
atp is directly required in which of the following processes in musclea net flux of sodium ions from intracellular space to extracellular spaceb