Ollie W. GCSE Biology tutor, IB Biology tutor, A Level Biology tutor...

Oliver W.

£30 /hr

Studying: Natural Sciences (Bachelors) - Cambridge University

5.0
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38 reviews| 87 completed tutorials

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About me

Hello! I have just graduated from the University of Cambridge with a degree in Neuroscience, which included modules in Cell Biology, Chemistry and Maths.

I studied at Sevenoaks School for 5 years on a double academic scholarship, graduating with 43 points at IB and 10 A*s at (I)GCSE. At IB Higher Level I studied Biology, Chemistry and Maths so I would love to share my passion for science with students! I am, of course, very well-versed with the unique aspects of the IB such as science coursework, exam practice and the Extended Essay (EE). In my EE in Chemistry I achieved 35 out of 36 marks. I can also give students in-depth mentoring on personal statements, admissions advice and Oxbridge interview preparation. 

In my free time I enjoy reading, travelling and flying aeroplanes. I'm a friendly and organised person, so I look forward to hearing from you though a free Meet The Tutor session!

Hello! I have just graduated from the University of Cambridge with a degree in Neuroscience, which included modules in Cell Biology, Chemistry and Maths.

I studied at Sevenoaks School for 5 years on a double academic scholarship, graduating with 43 points at IB and 10 A*s at (I)GCSE. At IB Higher Level I studied Biology, Chemistry and Maths so I would love to share my passion for science with students! I am, of course, very well-versed with the unique aspects of the IB such as science coursework, exam practice and the Extended Essay (EE). In my EE in Chemistry I achieved 35 out of 36 marks. I can also give students in-depth mentoring on personal statements, admissions advice and Oxbridge interview preparation. 

In my free time I enjoy reading, travelling and flying aeroplanes. I'm a friendly and organised person, so I look forward to hearing from you though a free Meet The Tutor session!

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About my sessions

I will make sure tutorials are engaging, enjoyable and well-explained. I regularly find and use suitable premium teaching resources which would usually have to be purchased separately. I usually structure my tutorials by recapping what we covered last time, followed by teaching new material whilst testing knowledge, then finishing with a review and answering any questions you have. The tutoring method I have found works best is to check the syllabus to see what we need to focus on, then to go through those topics in appropriate depth, followed by checking the syllabus again to make sure we've covered everything. However, I'm very happy to tailor the sessions to what works best for you. This is supported by questions which I can set you to complete and which we can review in a future tutorial or written session.

I will make sure tutorials are engaging, enjoyable and well-explained. I regularly find and use suitable premium teaching resources which would usually have to be purchased separately. I usually structure my tutorials by recapping what we covered last time, followed by teaching new material whilst testing knowledge, then finishing with a review and answering any questions you have. The tutoring method I have found works best is to check the syllabus to see what we need to focus on, then to go through those topics in appropriate depth, followed by checking the syllabus again to make sure we've covered everything. However, I'm very happy to tailor the sessions to what works best for you. This is supported by questions which I can set you to complete and which we can review in a future tutorial or written session.

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14/11/2016

Ratings & Reviews

5from 38 customer reviews
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Nathan (Student)

October 26 2017

pretty decent

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Nathalie (Student)

Very well prepared and structured class. And friendly.

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Loreen (Parent)

July 31 2017

clear lesson plan, informative documents

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Loreen (Parent)

July 26 2017

concise lesson, clear and easy to understand handout sheets

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Qualifications

SubjectQualificationGrade
Chemistry HLInternational Baccalaureate (IB) (HL)7
Biology HLInternational Baccalaureate (IB) (HL)7
Maths HLInternational Baccalaureate (IB) (HL)6
English SLInternational Baccalaureate (IB) (SL)6
Economics SLInternational Baccalaureate (IB) (SL)7
Mandarin SLInternational Baccalaureate (IB) (SL)7
Extended Essay in ChemistryInternational Baccalaureate (IB) (SL)A
Theory of KnowledgeInternational Baccalaureate (IB) (SL)A

General Availability

Before 12pm12pm - 5pmAfter 5pm
mondays
tuesdays
wednesdays
thursdays
fridays
saturdays
sundays

Subjects offered

SubjectQualificationPrices
BiologyA Level£30 /hr
Extended Project QualificationA Level£30 /hr
BiologyGCSE£30 /hr
ChemistryGCSE£30 /hr
EconomicsGCSE£30 /hr
MathsGCSE£30 /hr
BiologyIB£30 /hr
BiologyIB£30 /hr
ChemistryIB£30 /hr
Maths13 Plus£30 /hr
-Personal Statements-Mentoring£30 /hr

Questions Oliver has answered

How are action potentials propagated along a neuron?

Electical impulses usually arrive at the dendrites of a neuron. These then pass through the cell body and a propagated down the longest part of the neuron, the axon.

Resting potential

This is the potential difference across the membrane of the axon when there is no action potnential being carried. It is established by sodium-potassium pumps and membrane channels. The pumps pump out sodium from the cell and pump potassium into it. This, in iteslef, does not change membrane potential as an equal number of ions are pumped in an out, and sodium and potassium ions have equal yet oppostie charges. However, there are also membrane channels which allow sodium or potassium to move passively across the membrane. At resting potential, these are usually closed but the potassium channel is slightly leaky. This means that some of the potassium ions inside the cell are able to move down the concentration gradient to outside the cell. This establishes a negative charge inside the cell, of about -70mV. This is the resting potential.

Action potential

The sodium and potassium channels in the membrane are voltage-gated. Therefore, when an action potential arrives from further up the axon, it stimulates the sodium channels, which open. This allows the sodium ions to move from outside to inside the cell. This causes a relatively higher charge inside the cell compared to outside, and thus an action potential of around +30mV. The cell is now depolarised.

The potassium pumps are slightly slower to respond, but are eventually activated by this voltage. They open, allowing potassium ions to flow out of the cell. This causes the membrane potential to fall to just below the original resting potential, as the potassium ions flow down the concentration gradient outside the cell. This is known as hyperpolarisation.

The resting potential is eventually re-established by the sodium-potassium pumps.

This sequence is repeated by adjacent channels further down the axon and in this way the action potnential is propagated.

Electical impulses usually arrive at the dendrites of a neuron. These then pass through the cell body and a propagated down the longest part of the neuron, the axon.

Resting potential

This is the potential difference across the membrane of the axon when there is no action potnential being carried. It is established by sodium-potassium pumps and membrane channels. The pumps pump out sodium from the cell and pump potassium into it. This, in iteslef, does not change membrane potential as an equal number of ions are pumped in an out, and sodium and potassium ions have equal yet oppostie charges. However, there are also membrane channels which allow sodium or potassium to move passively across the membrane. At resting potential, these are usually closed but the potassium channel is slightly leaky. This means that some of the potassium ions inside the cell are able to move down the concentration gradient to outside the cell. This establishes a negative charge inside the cell, of about -70mV. This is the resting potential.

Action potential

The sodium and potassium channels in the membrane are voltage-gated. Therefore, when an action potential arrives from further up the axon, it stimulates the sodium channels, which open. This allows the sodium ions to move from outside to inside the cell. This causes a relatively higher charge inside the cell compared to outside, and thus an action potential of around +30mV. The cell is now depolarised.

The potassium pumps are slightly slower to respond, but are eventually activated by this voltage. They open, allowing potassium ions to flow out of the cell. This causes the membrane potential to fall to just below the original resting potential, as the potassium ions flow down the concentration gradient outside the cell. This is known as hyperpolarisation.

The resting potential is eventually re-established by the sodium-potassium pumps.

This sequence is repeated by adjacent channels further down the axon and in this way the action potnential is propagated.

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1 year ago

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