Hi, I'm Ellie, and I am in my first year of studying Zoology at the University of Bristol. I went to Eastbourne College so I have recieved some great teaching over the years! Having the right teacher can make all the difference between just understanding a subject and loving a subject. I am passionate about my subjects, and since I have become a tutor, I have so enjoyed seeing my students grow in confidence and ability. I am patient and approachable, so I want you to feel comfortable enough around me to ask any questions you may have - however silly they may seem! It is important that you really understand every detail, so that when it comes to the exam you know exactly what the question is asking.
Before the sessions, I will ask you if you are struggling with anything in particular, and if so, we can go through these areas in detail. If not, we can either cover the whole syllabus or work on past papers and exam technique, it's up to you! I prefer you to tell me what you want to work on, as that way we can really make sure there is nothing you are unsure about. I have picked up a lot of useful methods and tips throughout my education, and I would love to pass them on to you, and create a love of learning that lasts a lifetime.
Please get in touch if you have any questions, and book a free 'Meet the Tutor' session. I look forward to meeting you!
|Biology||A Level||£20 /hr|
|Music (AS Level)||A-Level||B|
|Before 12pm||12pm - 5pm||After 5pm|
Please get in touch for more detailed availability
Nadia (Student) June 4 2016
Nadia (Student) May 20 2016
Shazia (Parent) May 16 2016
Nadia (Student) May 10 2016
When a neurone is at rest, the outside of the neurone is more positive than the inside. This is due to the sodium-potassium pump which actively pumps 3 Na+ outside the cell, whilst at the same time pumping 2 K+ inside the cell. This creates a potential difference of -70mV, known as the resting potential. If a receptor is stimulated, there is a change in the permeability of the membrane, as Na+ channels open, allowing many Na+ ions to move into the cell, down a concentration gradient. This is called depolarisation, and causes the inside of the cell to become more positive than the outside. If the potential difference reaches about -50mV, an action potential will be fired. This is known as the threshold value. The potential difference keeps increasing until it reaches about +40mV. At this point, the Na+ channels close, and K+ channels open allowing K+ to leave the cell. The cell becomes repolarised, as the potential difference decreases and approaches the resting potential. However, the potential difference goes slightly below the resting potential, as there is a slight delay before the K+ channels close. This is called hyperpolarisation. The potential difference then returns to the resting potential.see more