MYTUTOR SUBJECT ANSWERS

312 views

How can an impulse be passed along a membrane?

The resting membrane is polarized, meaning the interior is –70 mV/negative relative to the outside. In this state more sodium ions (Na+) are outside the cell than inside. In contrast, more potassium ions (K+) are inside than outside.

A disturbance of the membrane opens sodium ion channels and sodium ions rush to the inside of the cell causing depolarization. Then, sodium ion channels shut and potassium ion channels open causing potassium ions to rush out and helping to restore the polarized state of membrane. This entire process is called an action potential. Sodium–potassium pumps then maintain polarity.

This process is repeated along the length of a neuron. Sodium ions diffuse between regions with an action potential and the region at resting potential.

Laura H. IB Biology tutor, GCSE Biology tutor, IB German tutor, A Lev...

8 months ago

Answered by Laura, an IB Biology tutor with MyTutor


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

17 SUBJECT SPECIALISTS

£20 /hr

George R.

Degree: Biology with Industrial Experience (Bachelors) - Manchester University

Subjects offered:Biology, Zoology+ 6 more

Biology
Zoology
Psychology
Maths
Human Biology
French
English Literature
-Personal Statements-

“Hardworking and enthusiastic people person that loves the subjects I tutor and loves to learn as well as teach!”

£22 /hr

Anna Liisa J.

Degree: Biomedical Science (Bachelors) - Kings, London University

Subjects offered:Biology, Economics+ 1 more

Biology
Economics
Chemistry

“My name is Anna Liisa Jalakas and I am a biomedical sciences student. I completed my IB diploma in June of 2016 where I achieved a total of 40 points with a 7 in Biology and Economics, and a 6 in Chemistry. I also have IGCSE qualifica...”

£22 /hr

Victoria T.

Degree: Biomedical Sciences (Bachelors) - Queen Mary, London University

Subjects offered:Biology, Japanese+ 1 more

Biology
Japanese
French

“Hi, my name is Victoria. I was born in France and moved to London to study Biomedical Sciences. Having been in an international school, I am bilingual in French and English and learnt other languages like Japanese. Alongside, I was ab...”

About the author

Laura H.

Currently unavailable: for regular students

Degree: Psychology (Bachelors) - Glasgow University

Subjects offered:Biology, German

Biology
German

“About Me I am a fourth year psychology student at the University of Glasgow and thus, psychology is my area of expertise and also my passion. However, during my first two years at university I took an extensive range of biology course...”

MyTutor guarantee

You may also like...

Posts by Laura

How can an impulse be passed along a membrane?

How do I evaluate a study?

How many studies should I cite in my psychology essay?

What is the difference between a gene and an allele?

Other IB Biology questions

Explain how sound is perceived by the ear, including the roles of the eardrum, bones of the middle ear, oval and round windows, and the hair cells of the cochlea.

Explain enzyme-substrate specificity

I know all the theory, but I can never score well with the essay questions in paper 2. Why?

How are action potentials propagated along a neuron?

View IB Biology tutors

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

mtw:mercury1:status:ok