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What are the stages in the conduction of a cardiac impulse?

The heart is myogenic which means it generates its own electrical impulse - this originates from the sinoatrial node in the right atrium. 2. The impulse from the SA node passes through the right and left atr...
JM
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How do glucose and oxygen get into the blood to be used for respiration?

When we breathe we inhale oxygen from the air into our lungs. The alveoli are tiny air sacs in the lung where oxygen diffuses into the blood via small blood vessels, known as capillaries. The blood in these ...
AP
Answered by Anna P. • Biology tutor
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Describe briefly how you would show that manganese(II) ions catalyse the reaction between manganate(VII) ions and ethanedioate ions, in dilute sulphuric acid.

Mix the reagents and record the time taken for a specific observation, e.g. disappearance of colour which is characteristic for this chemical reaction. We repeat this step and add more manganese(II) ions; a ...
SS
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How is a root hair cell specialised to its function?

Root hair cells have a very large surface area due to them being very long and having hair like projections. This allows more active transport of mineral ions to take place so the plant is able to take in as...
EB
Answered by Emily B. • Biology tutor
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What is saltatory conduction?

Motor neurones have a myelin sheath made of Shwann cells. It's an electrical insulator meaning action potentials cannot pass through them. Along the axon there are gaps where there's no myelin sheath, called...
EB
Answered by Emily B. • Biology tutor
4517 Views