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in a properly functioning negative feedback system thea value of the controlled variable will always be very close to the threshold value when the
a decrease in blood plasma levels of calcium will lead toa an increase in the calcium ion excretion in the urineb an increase in the calcium ion
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 positive feedback systema blood plasma levels of pth
which of the following serves as a sensor or as part of a sensor that functions only in a negative feedback system and not in a positive feedback
the av node of a mammalian heart is destroyeda a depolarization in a cell in the left atrium will cause a depolarization of a cell in the left
a decrease in parasympathetic discharge to the heart leads toa an increase in the conductance of f-channels in sa node cellsb a decrease in the
what are the parasympathetic neuronspatient a has a disease that has destroyed half of the alpha-adrenergic receptors on each of the smooth muscles
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 system
which of the following is true for active hyperemia a local control mechanism within the circulatory systema there will be a decrease in force
what is firing rate of carotid artery baroreceptorsat 100 am person xs blood pressure is equal to the blood pressure set point at 101 am there is
an increase in the calcium conductance of all sarcoplasmic reticulum membranes of a skeletal muscle with no external forces on it leads toa increased
when the overlap between the thin and thick filaments of a sarcomere in a skeletal muscle is decreasing thea total length of the i band minus the
which of the following is true in a skeletal musclea movement of the cross-bridge occurs only when the myosin head is detached from the actin
in the sarcomere of a skeletal muscle there area myosin molecules in the i bandb both tropomyosin and myosin molecules in the region of the a band
which of the following is true for the following ning membrane proteinsa the machr muscarinic acetylcholine receptor is a ning membrane
what is right patellar tendonwhich of the following occur in response to an increase in the length of the right knee extensors in response to a quick
name the system that contains three neuronsconsider a system that contains three neurons in a culture dish bathed in normal physiological saline
addition of glycine to the physiological saline a complete motor neuron is removed from a frog and placed in a large volume of normal physiological
determine the extracellular concentration of tva consider neuron b in the frog central nervous system whose plasma membrane has a previously unknown
amount of intracellular chloride ions in neuron aneuron a is a healthy neuron with all the usual ion channels when at rest with a membrane
person z swallowed a large amount of substance x and as a result has convulsions abnormal violent contractions of skeletal muscles swallowing
which of the following serves as a sensor or as part of a sensor that functions in a negative feedback systema casrs calcium-sensing receptors
define endocytosis of glut4 transporters person x is a healthy human who has volunteered to take experimental drug y person x has a normal dinner
insulin binding to insulin receptors in the plasma membrane of aa liver cell will lead to an increase in the intracellular amounts of camp in the