61) Study the graph below and use it to answer the following questions. (8 point

Question

61) Study the graph below and use it to answer the following questions. (8 points) a) What myocardial cells generate this b) What is the resting membrane c) Draw vertical dashed lines on the graph to the left that show the d) At point 0, what ion is primarily kind of action potential? potential of these cells? beginning AND end of the refractory period for these cells. (0.5 pt) 2 moving through the membrane? These channels are gated The influx of what ion contributes to the horizontal stage marked with a 2? 0 3 e) f) What ion is moving through the membrane at point 3? In what direction is it moving? (influx or efflux) Imagine that these cells receive increased sympathetic signaling. In a few COMPLETE sentences, 1) identify the signal molecule, 2) identify the specific receptors on these cells, 3) describe HOW the function of these cells will change (imagine that you are describing the "effector's action" of a feedback loop), and 4) describe HOW blood pressure will ultimately change. Be as specific as possible, and if you need more room, continue on the back of this page. (3 points) g) Page 4 of 8 FORM D

Explanation / Answer

Ans. 1 cardiomyocytes generate these kind of action potential.

Ans 2 RMP of these cells are -90mV

Ans 4 influx of sodium through voltage gated fast sodium channels.

Ans 5 influx of calcium contributes to horizontal line.

Ans6 potassium is moving outside of cell(eflux).

Ans4 refractory line passes thru "0" and last phase of "3".

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