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Dani E.

Currently unavailable: for regular students

Degree: Biological Sciences (Bachelors) - Oxford, Keble College University

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About me

I have just completed a BA in biology at Oxford and will hopefully be going on to do a PHD in interdisciplinary biosciences at Oxford next year. My main interests are in animal behaviour and sensory systems but my degree has covered a broad range of areas including cellular, genetic, plant and animal biology. I am keen to assist with GCSE and A level biology, along with personal statements and other aspects of university applications. 

Subjects offered

SubjectLevelMy prices
Biology A Level £20 /hr
Biology GCSE £18 /hr
-Personal Statements- Mentoring £20 /hr

Qualifications

QualificationLevelGrade
BiologyA-LevelA*
ChemistryA-LevelA*
EnglishA-LevelA*
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CRB/DBS Standard

No

CRB/DBS Enhanced

No

Currently unavailable: for regular students

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Questions Dani has answered

How are signals transmitted across the synaptic cleft?

When the action potential reaches the synaptic knob it causes voltage-gated calcium ion channels to open, allowing calcium ions to diffuse in. These calcium ions cause synaptic vesicles containing acetylcholine to move to an fuse with the pre-synaptic membrane where they release the acetylchol...

When the action potential reaches the synaptic knob it causes voltage-gated calcium ion channels to open, allowing calcium ions to diffuse in.

These calcium ions cause synaptic vesicles containing acetylcholine to move to an fuse with the pre-synaptic membrane where they release the acetylcholine into the synaptic cleft by exocytosis.

The acetylcholine moves across the cleft by diffusion and binds to receptors on the post-synaptic membrane.

This causes sodium ion channels to open allowing sodium ions to diffuse into the post-synaptic neurone.

This creates an excitory post-synaptic potential (EPSP) and if this is above threshold potential, an action potential is created in the post-synaptic neurone.

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6 months ago

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what are the differences between involuntary, cardiac and voluntary muscle?

Involuntary muscle (or smooth muscle) is innervated by the autonomic nervous system and therefore is not under conscious control. It is not striated - rather, muscle cells contain small bundles of actin and myosin. It is found in the walls of the intestine, the iris, the walls of arteries and ...

Involuntary muscle (or smooth muscle) is innervated by the autonomic nervous system and therefore is not under conscious control. It is not striated - rather, muscle cells contain small bundles of actin and myosin. It is found in the walls of the intestine, the iris, the walls of arteries and the walls of the uterus and cervix. Involuntary muscle contracts slowly but tires very slowly.

Cardiac muscle is found in the heart and can be divided into three sub-types of muscle: atrial muscle, ventricular muscle, and specialised excitatory and conductive muscle fibres. Cardiac muscle is myogenic meaning muscle fibres can stimulate contractions without needing input from a nerve impulse. Cardiac muscle is striated and contracts powerfully thoughout the life without tiring.

Voluntary muscle is responsible for causing movements of the skeleton at joints. It is innervated by the somatic nervous system. Voluntary muscle is striated and contracts quickly and powerfully but tires quickly.

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6 months ago

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