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Biology
A Level

What is the difference between haemodialysis and peritoneal dialysis?

Both are forms of treatment for kidney failure so the blood is left unfiltered as this is one of the main functions of the kidneys. In haemodialysis all of the blood is filtered and it is done externally ...

VD
Answered by Vaibhi D. Biology tutor
13504 Views

Describe the series of events from the arrival of an action potential at the pre-synaptic membrane of a cholinergic synapse to the generation of a new action potential at the post synaptic membrane?

  1. An action potential arriving at the pre-synaptic membrane stimulates voltage-gated calcium channels to open and calcium ions diffuse into the neuron through these calcium channe...

DZ
Answered by Daniella Z. Biology tutor
11711 Views

Compare and contrast the causes of Type 1 (insulin-dependent) and Type 2 (noninsulin-dependent) diabetes mellitus

Type 1 diabetes mellitus occurs when the body's immune system attacks beta cells within the Islets of Langerhans, in the pancreas. The immune system recognises pancreatic self-antigens as foreign and begi...

JL
Answered by James L. Biology tutor
8094 Views

In the process of mitosis, which stages occur? Describe each stage.

Mitosis is a form of cell division that produces genetically identical cells and it includes 4 main stages. Before Mitosis can occur the cell undergoes Interphase, in which DNA and organelles are replicat...

HC
Answered by Holly C. Biology tutor
9585 Views

How is an action potential (AP) transmitted across a synapse?

As an action potential (AP) arrives at the synaptic knob and depolarises the presynaptic membrane, voltage-gated Ca2+ channels open, allowing the entry of Ca2+ ions, This caues vesicles (membrane-bound or...

YC
Answered by Young C. Biology tutor
6623 Views

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