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How does the blood move through the heart?

The heart is a pump, which moves blood around your body. It has 4 areas filled with blood, called chambers and a right and left side. There are two atria and two ventricles, one of each on each side. The blo...
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Answered by Grace M. • Biology tutor
5486 Views

What is a reflex and what do you mean by a reflex arc? (both "reflex" and "reflex arc" are on the CCEArevised GCSE Biology specification)

1. A reflex is an automatic response to a stimulus . For example: If I touch a hot plate, my hand will automatically pull away from the heat. Another example is the pupillary light reflex. If you turn on a l...
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Answered by Michael M. • Biology tutor
4895 Views

Why are there no progressive tenses in German?

The sentences “I eat” and “I am eating” are the same in German: “Ich esse.” For speakers of the English language, this may be confusing. In fact, if someone says “Ich esse Fisch,” do they mean “I eat fish” o...
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Answered by Csongor M. • German tutor
2593 Views

What is the difference between 'ser' and 'estar'?

Both 'ser' and 'estar' translate as 'to be' in English, so it's a little confusing to know which one to use. The most basic rule is that 'ser' is used for permanent states such as a characteristic or someone...
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Answered by Laura O. • Spanish tutor
2474 Views

What is the difference between Ser and Estar and how should I use them?

'Ser' and 'Estar' both directly translate to the verb 'to be' in English. However, in Spanish they both have very different meanings. Before being able to conjugate them, we must understand what they mean. '...
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Answered by Caitlin G. • Spanish tutor
3247 Views