Home-Temple Univers xHuman A at & physioll × Homework #3 (- ù Secure I https://n

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Home-Temple Univers xHuman A at & physioll × Homework #3 (- ù Secure I https://newconnect.mheducation.com/flow/connect.html Homework #36) Help Save&Exit Submit Complete each sentence by dragging the labels to the appropriate blanks. Then place each sentence in a logical order beginning with the SA node in a resting state Drag the let bisoks bnietheir massive inu The depolarizing eem ot e s caused by e rapid movement of Unike themembrane of neurons and skeletal muscle resting patental o the SAnode ns upwaro due to a of soourm channels open Then, as in sellenal muscle and neurons, sotage-regulaned open and ossium bo Reset 1:10 PM 17/2018 O Type here to search

Explanation / Answer

Answer

1) The depolarizing event of the action potential is caused by the rapid movement of sodium and calcium to the ICF.

2) Unlike the membrane of neurons and skeletal muscle, resting potential of the SA node drifts upward due to a steady leak of sodium ions to the ICF.

3) Moving from -60 mV to a threshold of -40 mV, voltage-regulated fast calcium and sodium channels open.

4) The movement of potassium to the ECF repolarizes the membrane and returns the SA node cells to -60 mV.

5) Then, as in skeletal muscle and neurons, voltage-regulated potassium channels open and allow potassium to rush to the ECF.

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