MYTUTOR SUBJECT ANSWERS

550 views

Describe the events that take place in a neurone which produce an action potential

- The action potential begins when the stimulus exceeds the threshold.

- The voltage gated sodium ion channels open.

- Sodium ions diffuse into the axon down an electrochemical gradient.

- Positive feedback occurs (more sodium ion channels open).

- This depolarises the membrane.

- The membrane potential reverses from -65mV to +40mV.

- The voltage gated potassium ion channels now open.

- Potassium ions diffuse out of the axon down an electrochemical gradient.

- The sodium ion channels close.

- Hyperpolarisation occurs.

- But the sodium potassium pump then restores the resting potential by   actively transporting 3 Na+ out of the axon and 2K+ into the axon.

Lauren G. GCSE Biology tutor, A Level Biology tutor, GCSE Maths tutor...

2 years ago

Answered by Lauren, an A Level Biology tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

146 SUBJECT SPECIALISTS

£20 /hr

Michal D.

Degree: Medicine (Bachelors) - Newcastle University

Subjects offered: Biology, Human Biology+ 4 more

Biology
Human Biology
Chemistry
.UKCAT.
-Personal Statements-
-Medical School Preparation-

“I am a third year Medical Student at Newcastle University, currently undertaking a clinical placement year in hospital. While at Sixth form I was able to gain experience in tuition by helping out other students in their GCSEs and A-Le...”

MyTutor guarantee

£20 /hr

Rasmus K.

Degree: Medicine (Bachelors) - Nottingham University

Subjects offered: Biology, Human Biology+ 4 more

Biology
Human Biology
.UKCAT.
.BMAT (BioMedical Admissions)
-Personal Statements-
-Medical School Preparation-

“Who am I? Hi, my name is Rasmus. I'm a fourth year medical student at the University of Nottingham. For me, medicine came from an initial love of science and became a dream that I am now fulfilling. I hope to instil the same enthusias...”

£20 /hr

Laura B.

Degree: Chemistry with Medicinal Chemistry (Masters) - Newcastle University

Subjects offered: Biology, French+ 1 more

Biology
French
Extended Project Qualification

“I am a kind, encouraging person, always with a smile on my face. I have a high regard for learning, and believe that adding every day context to topics makes them easier to grasp. Being the eldest of 4 children has taught me patience a...”

MyTutor guarantee

About the author

£24 /hr

Lauren G.

Degree: Biosciences (Masters) - Durham University

Subjects offered: Biology, Maths+ 1 more

Biology
Maths
Chemistry

“Hi, I'm Lauren, and I am a second year Biosciences undergraduate at Durham University. I'm passionate about science, and I would love to help out anyone who is struggling with A-Level Biology, or GCSE Biology, Chemistry or Maths.”

You may also like...

Other A Level Biology questions

What's the difference between the light dependent and independent reactions?

What are the different phases of the cell cycle?

Please could you explain Oxidative Phosphorylation?

What is competitive inhibition in enzymes?

View A Level Biology tutors

Cookies:

We use cookies to improve our service. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok