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Describe the electrical conductance system of the heart?

An excitation signal (an action potential) is created by the sinoatrial (SA) node.The wave of excitation spreads across the atria,causing them to contract.Upon reaching the atrioventricular (AV) node, the si...
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Answered by Jason S. • Science tutor
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HIV is diagnosed by blood tests. State two safety precautions that need to be taken when handling blood samples.

In order to make sure that safety precautions are met, when handling blood samples we must make use of gloves in order to cover all cuts and avoid contact. Furthermore, you must store samples in sealed conta...
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Describe the mechanism by which antibiotic resistance develops in bacteria?

Within a population of bacteria, one bacterium undergoes a random mutation in it’s DNA resulting it it having antibiotic resistance. The chance of this mutation happening can be increased by the overuse of a...
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Answered by Megan C. • Science tutor
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What two products are produced when a metal and an acid are added together

Metal + acid ---- salt + waterso... Salt + water are the two products produced
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Answered by Lily W. • Science tutor
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What are the three types of radiation?

Alpha, beta, gamma
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Answered by Lily W. • Science tutor
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