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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...
JS
Answered by Jason S. • Science tutor
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A wheelbarrow is lifting a load of 150N at a distance of 50cm from the pivot. Calculate the turning effect

The turning effect (or moment) of a force can be calculated using this equation: moment of a force = force (F) x perpendicular distance from the pivot (d) So in this case, the moment = 150 x 0.5 (measured in...
EA
Answered by Ebele A. • 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...
Answered by • Science tutor
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Give the word equation for aerobic respiration and explain the difference between aerobic and anaerobic respiration in animals

Respiration: Glucose + Oxygen --> Water + Carbon Dioxide + Energy If there is a lack of oxygen then anaerobic respiration will take place instead of aerobic respiration, which in animals has the following...
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Answered by Orlando B. • Science tutor
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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...
MC
Answered by Megan C. • Science tutor
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