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scan0005 - M 21 Predict the equilibrium potential for K(EM...

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Unformatted text preview: M 21. Predict the equilibrium potential for K (EM). Show calculations on this exam sheet. a. -70 mV g b. -91 mV (‘0 f l of" i c. “55 mV w 155 — d +55 mv - Q If the neuron above receives a signal that causes membrane K” channels to open, which way will K+ m e . into the cell “.3 i am» last . 9 WC C as; F «(tic/<1) 23. In the neuron above if the permeability of Na were to decrease so it is now 50 times less than that of K. with no change' In the ECF and lCF concentration of K and Na‘, how would this affect the movement of K+ through an open K‘ channel? a. K+ would move into the cell the electrical gradient is now equal in magnitude to the concentration gradient for K+ so net movement of K+ across the membrane will stop 24. Both insulin and glucagon are peptide hormones that target liver cells. The response of the target cells to each of these two hormones is opposite (antagonistic). This information implies that a. the two hormones bind to different cell membrane receptors. b. one hormone binds to a receptor on the cell membrane and the other to an intracellular receptor. L/ c. each of the two hormones uses a different intracellular second messenger d. both hormones interact with receptors at the cell nucleus 8“ 25. Sue. a patient under your supervision. has been taking high dose prednisone to minimize the effects of a chronic. inflammatory disease . Prednisone mimics the actions of cortisol. Which of the following might be Sue’s data from laboratory tests while taking prednisone? Plasma levels of hormones before taking prednisone are in parentheses. CRH (2.3 nM) ACTH ( 5 nM) cortisol {10 nM, endogenous) K a. 2.3 5.2 V 10.2 -- b. 14 25 16 c. 1.0 1.5 a . 254 d. 21.0 13.6 ‘i‘ at 0.1 e. 0.5 1.0 0.563;} 26. Dexamethasone is a drug used to suppress the secretion of ACTH from the anterior ._ pituitary gland. Three patients with hypersecretion of cortisol are given dexamethasone. Patient'C‘s cortisol secretion falls to normal levels after the medication, but patient A’s and patient B‘s cortisol secretion remains elevated. Which patient(s) has/have primary hypercortisolism? ”— a. patient A b. patient B ...
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