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How is an action potential generated?

During rest, the outside of the neurone membrane is positively charged (relative to the inside). This is because approximately three sodium ions move out for every two potassium ions moving in through the so...
SI
Answered by Sabina I. • Biology tutor
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How do we control our heart beat

To begin with, we should first look at how the heart beats. Beating of the heart is due to myogenic muscle contraction, This means the myocyte (muscle cell) itself is the origin of the contraction and is not...
JD
Answered by Jess D. • Biology tutor
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Use your knowledge of the actin and myosin mechanism of muscle contraction to explain how a vesicle might be "walked" along the cytoskeleton of a cell.

ATP binds the myosin head in its resting state. ATP is hydrolysed to ADP + Pi, releasing energy. This changes the conformation of the myosin head, cocking it. The myosin head reattaches to the actin molecule...
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Answered by Alex H. • Biology tutor
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What is diffusion? Provide an example of this process in a biological system.

Diffusion refers to the process where particles (molecules and ions) move from an area of high concentration to an area of lower concentration . I would draw a diagram of the process and make it clear that p...
EH
Answered by Elizabeth H. • Biology tutor
3233 Views

Can you name the 3 different energy systems and give an example when each would be used?

Atp/pc system- ATP is hydrolysed into ADP + Pi, the free phosphate is used in exercises of 2-10s such as a powerlift.Anaerobic energy system- Glucose is the fuel for energy of glycolysis- used in exercises o...
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Answered by Seb G. • Biology tutor
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