05 question 1 point open ebook section 123 1st attempt when...

Name: 05 question 1 point open ebook section 123 1st attempt when a neuron is activated by a stimulus its plasma membrane will change until it reaches a membrane potential of about 40 mv what is s 23173
Uploaded: 2021-10-11T21:30:32-08:00
Duration: 3 min 45 s
Channel: Bryan Valdivia
Description: 05 question 1 point open ebook section 123 1st attempt when a neuron is activated by a stimulus its plasma membrane will change until it reaches a membrane potential of about 40 mv what is s 23173

05 Question (1 point) Open Ebook section 12.3 1st attempt When a neuron is activated by a stimulus, its plasma membrane will change until it reaches a membrane potential of about +40 mV. What is special about this value? Choose one: O A. It is the threshold potential at which voltage-gated Na+ channels close. O B. It is approximately the membrane potential at which the electrochemical gradient for Na+ is zero. O C. It is the threshold potential that opens voltage-gated Na+ channels. O D. It is approximately the membrane potential at which the electrochemical gradient for K+ is zero. O E. It is the opposite of the resting membrane potential. See Hint 4 OF 9 QUESTIONS COMPLETED < PREVIOUS 5 of 9 Questions NEXT > SUBMIT ANSWER

Transcript

00:01 Okay, now that's this question, let's talk about the resting memory potential.

00:03 Remember that if this is your voltage of your cell, or, well, in this case of the neural, if you have a wasting memory potential of minus 60 milliolts, and as opposed the threshold potential, well, let's not talk about that threshold.

00:18 We don't have to talk about the threshold right now.

00:21 This is the resting memory potential.

00:22 Okay.

00:23 At this values, if this is your cell, the intracellular is electronegative in comparison with the extracellular.

00:29 Okay.

00:30 So this is in the wasting.

00:33 And also at this wasting memory potential, the concentrations of sodium are higher in the extracellular and are lower in the intracellular.

00:43 Okay.

00:43 And when we talk about the concentration of potassium, they are higher in the intracellular and they are lower in the extracellular.

00:52 So this is what happens in the resting memory potential.

00:56 Also, at this question member potential, there are some potassium liquid channels that are moving.

01:03 Potassium out of the cell.

01:06 Okay, but we also have the sodium potassium atpas that is moving potassium inside of the cell and moving sodium out of a cell.

01:16 Okay, so this is what happens at the wasting memory potential.

01:19 The question says, what happens to the wasting memory potential of a neuron and sodium channels are normally open, okay, in the membrane, but everything else was the same.

01:28 Normally, when sodium channels open in the cell membrane, the voltage of the cell rise because sodium ions starts entering the cell membrane.

01:42 They start entering the cell membrane, and this is going to rise the voltage of the cell, going to the positivity, it means this is going to make the voltage of the cell less negative...

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