Top answers

What are the structural and functional differences between arteries and veins?

Arteries have a much thicker muscular layer than veins, as this allows them to contract strongly and generate a high pressure to allow blood to be quickly transported to tissues in the body. Arteries also ha...
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Answered by Anita R. • Biology tutor
3402 Views

What are the four processes of erosion

Hydraulic action, abrasion, attrition and solution.
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Answered by Bianca S. • Geography tutor
3635 Views

Name and outline the two types of circulatory systems

A single circulatory system is where blood flow starts with deoxygenated blood being pumped by the heart to the lungs or gills and then travelling directly to the rest of the body’s tissues. Found in fish an...
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Answered by Bianca S. • Biology tutor
8228 Views

How does an action potential work?

Resting potential at - 75mV Stimulus causes opening of sodium channels and influx of sodium ions, membrane becomes less polarized Threshold potential reached at -55mV, opening of many more sodium channels, g...
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Answered by Catherine H. • Biology tutor
3412 Views

How do you form the imperfect tense in French?

Take a regular verb, e.g. jouer-to play. Conjugate it in the 1st person plural, I.e. nous. E.g. jouer= jouons Take off the -ons, to leave the stem. E.g. jou Add on the imperfect endings to the stem. Je-ais, ...
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Answered by William W. • French tutor
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