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Explain the concept of 'threshold potential' in the initiation of an action potential

Action potentials are only initiated when depolarization above a certain level occurs, this level is known as the 'threshold potential'. 'Vm' is the resting membrane potential (voltage) and the depolarizing ...
TD
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Explain the role of B-lymphocytes and T-lymphocytes in the defence of the body against a virus infection (6 Marks)

A virus is a pathogen which contains antigens on its cell surface. These antigens are detected and digested by macrophages. The two pathways involved in the detected and elimination of the virus is the cell-...
SR
Answered by Sumaiya R. • Biology tutor
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state 3 difference between DNA replication and transcription of DNA

DNA to DNA vs DNA to RNA cell division vs gene expression origin of replication vs promoter sequence
SK
Answered by Shobiga K. • Biology tutor
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Explain, in terms of the movement of ions, the shape of a typical action potential.

First, draw the graph of time against voltage for a typical action potential and label with points 1-8 (see whiteboard). 1. at rest, the membrane is polarised at -60mv (this is the potential inside the cell ...
RO
Answered by Rhiannon O. • Biology tutor
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What is the difference between the function of a receptor and the function of an effector.

Receptors detect and sense changes in their surroundings, called stimuli, e.g. a light receptor. Effectors produce the response to the stimulus, e.g. a muscle.
CS
Answered by Claudia S. • Biology tutor
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