Joel D. A Level Biology tutor, GCSE Biology tutor, GCSE Science tutor

Joel D.

£18 - £20 /hr

Currently unavailable: for regular students

Studying: Neuroscience (Bachelors) - Bristol University

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About me

I am a recent Neuroscience graduate from the University of Bristol. Ready to help with any of your Science queries - get in touch!

I am a recent Neuroscience graduate from the University of Bristol. Ready to help with any of your Science queries - get in touch!

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05/11/2014

Qualifications

SubjectQualificationGrade
BiologyA-level (A2)A
MathsA-level (A2)A

Subjects offered

SubjectQualificationPrices
BiologyA Level£20 /hr
BiologyGCSE£18 /hr
ScienceGCSE£18 /hr

Questions Joel has answered

Describe what happens at a chemical synapse

As the action potenial reaches the synaptic terminal depolarisation causes voltage-gated Ca2+ channels to open. The opening of these ion channels causes an influx of Ca2+ ions because of the high concentration gradient which is maintained across the cell membrane. Ca2+ in the synpatic terminal causes vesicles containing neurotransmitter molecules to move towards the membrane, and neurotransmitters to be released into the cleft by exocytosis. The neurotransmitter molecules diffuse across the cleft and bind to complementary receptors on the post-synaptic cell. The binding of neurotransmitters causes ion channels associated with the receptors to open, allowing the influx of ions. If sufficient ions enter the post-synaptic cell, an action potential will be generated. 

As the action potenial reaches the synaptic terminal depolarisation causes voltage-gated Ca2+ channels to open. The opening of these ion channels causes an influx of Ca2+ ions because of the high concentration gradient which is maintained across the cell membrane. Ca2+ in the synpatic terminal causes vesicles containing neurotransmitter molecules to move towards the membrane, and neurotransmitters to be released into the cleft by exocytosis. The neurotransmitter molecules diffuse across the cleft and bind to complementary receptors on the post-synaptic cell. The binding of neurotransmitters causes ion channels associated with the receptors to open, allowing the influx of ions. If sufficient ions enter the post-synaptic cell, an action potential will be generated. 

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3 years ago

813 views

What's the difference between the cell wall and cell membrane?

Cell wall:

Only present in plant cells, it provides structure and is completely permeable to biological molecules.

 

Cell membrane:

Much thinner than cell wall and is present in all cells. It is selectively permeable to certain molecules.

Cell wall:

Only present in plant cells, it provides structure and is completely permeable to biological molecules.

 

Cell membrane:

Much thinner than cell wall and is present in all cells. It is selectively permeable to certain molecules.

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3 years ago

914 views

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