Yvonne W. GCSE Biology tutor, GCSE Human Biology tutor

Yvonne W.

Currently unavailable: for regular students

Degree: Biological Sciences (Bachelors) - Durham University

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About me

About me

I am a Biological Sciences Student at Durham University. From Ecology to Molecular genetics I love all things Biology and hope to pass this enthusiasm onto you, allowing you to reach your full potential and really enjoy your study of science.

I am a very friendly and approachable person. I have really enjoyed being a youth leader at scouts and volunteering as a teaching assistant while in Sixth Form, which have given me the opportunity to teach children from a wide age range.

Sessions

Learning should always be enjoyable and my style of teaching reflects this. All tutoring sessions will be fun and relaxed, using a range of techniques (words, diagrams, analogies) to make sure that you understand key concepts (so important in science!) and can confidently explain them back to me, a sibling or even your cat!

Questions?

Feel free to message me with your exam board and which you areas of Biology you are struggling with, so that we can work together to help you!

Subjects offered

SubjectLevelMy prices
Biology A Level £20 /hr
Environmental Studies A Level £20 /hr
Biology GCSE £18 /hr
Human Biology GCSE £18 /hr

Qualifications

QualificationLevelGrade
Biology A-LevelA
Environmental Science A-LevelA
Chemistry A-LevelB
Disclosure and Barring Service

CRB/DBS Standard

No

CRB/DBS Enhanced

28/10/2015

Currently unavailable: for regular students

General Availability

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Questions Yvonne has answered

What is Homeostasis?

Homeostasis is the maintenance of a constant internal environment within the body. This sounds quite confusing but don’t panic – in simpler terms, homeostasis is the process which works to keep the conditions inside the body the same. This means that the reactions happening within cells can h...

Homeostasis is the maintenance of a constant internal environment within the body.

This sounds quite confusing but don’t panic – in simpler terms, homeostasis is the process which works to keep the conditions inside the body the same. This means that the reactions happening within cells can happen under their optimum conditions, which in turn means they are more efficient.

Here are some examples of conditions that need to be regulated:

Body Temperature

Blood sugar level

Water content

Homeostasis works because of negative feedback mechanisms. Negative feedback mechanisms work like this:

A change in the system from normal à this change is detected à control mechanisms are activated, returning conditions to normal à control mechanisms are switched off

Regulation of Body Temperature

Optimum body temperature is 37.5ºC. When body temperature is different from this, control mechanisms are activated to return the body to its optimum temperature.

When too hot:

Vasodilation – blood vessels dilate allow more blood to flow through the skin.

Sweating – when sweat evaporates it removes heat energy from the skin.

When too cold:

Vasoconstriction – blood vessels constrict, conserving heat in the center of the body

Shivering – shivering is caused by muscle contraction. Some of the energy produced by respiration of the muscle cells will be lost as heat, increasing body temperature.

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5 months ago

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What is osmosis?

Osmosis is the movement of water from a high concentration to a low concentration through a partially permeable membrane. It is a special type of diffusion. You may get questions asking you to decide which way direction water will flow through a partially permeable membrane. Always remember t...

Osmosis is the movement of water from a high concentration to a low concentration through a partially permeable membrane. It is a special type of diffusion.

You may get questions asking you to decide which way direction water will flow through a partially permeable membrane. Always remember that water will move from the side with highest water concentration (lowest solute concentration) to the side with the lowest water concentration (highest solute concentration).

Cells

Cell membranes exist in all cells. They are partially permeable membranes as they allow small molecules such as water molecules to diffuse through them, but not larger molecules such as sugars and salt ions. Osmosis can therefore happen in and out of cells, effecting the amount of water in the cell.

Plants are supported by the water pressure in their cells (this is useful because they do not have a skeleton). This movement of water in and out of plant cells is due to osmosis. If a cell is placed in pure water, water will move into the cell by osmosis. This is because it will move from a higher concentration in the pure water to a lower concentration in the cell, until the amount of water on each side of the permeable membrane is the same – until equilibrium is reached.

It can have consequences:

If too much water enters the plant cell it becomes turgid – completely full with water.

If too much water leaves the plant cell it becomes plasmolysed – the cell becomes limp and the cell membrane comes away from the cell wall.

A similar effect can be seen in animal cells, such as human red blood cells:

If too much water enters the animal cell it can burst – lysis

If too much water leaves the animal cell it can shrink – crenation

Animal cells burst and shrink, unlike plant cells, because they do not have the strong cell walls that plants have.

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5 months ago

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