Top answers

How does the body respond to raise its core body temprature?

shivering - muscles contract rapidly, causes more respiration which releases energy blood vessels near skin constrict - blood flow to skin decreases, less energy lost to surroundings
CS
Answered by Cara S. • Biology tutor
2664 Views

I have trouble remembering which muscle contracts and which muscle relaxes during the Iris reflex; could you explain it to me?

The first thing to remember is that muscles always act in pairs; so when one contracts, the other relaxes. Think of the muscles in your arm; when you bend your arm towards you, the bicep contracts so becomes...
SK
Answered by Sumayya K. • Biology tutor
35607 Views

How does osmosis work?

Osmosis can be explained as the passing of water molecules across a partially permeable membrane from an area of high concentration of water molecules to an area of low concentration of water molecules.If wa...
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Answered by Grace W. • Biology tutor
4630 Views

What's the difference between prokaryotic cells and eukaryotic cells

Eukaryotic cells are what make up you (and also plants), whereas prokaryotic cells make up bacteria. If you think about the fact that bacteria are way smaller than plants and animals, you can remember that t...
MS
Answered by Matt S. • Biology tutor
3323 Views

Describe how Giraffes evolved long necks (3)

Due to natural variation due to mutations in their DNA, some giraffes in the population had longer necks. These longer necks enabled them to reach leaves higher up on the trees, which secured them a good sou...
RS
Answered by Roshan S. • Biology tutor
3832 Views