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Describe the roles of calcium ions, ATP and phosphocreatine in producing contraction of S (b) a muscle fibre.

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BF
Answered by Bertie F. • Biology tutor
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Describe how a healthy kidney produces urine

At the Bowman's Capsule, the blood undergoes ultrafiltration. This is when the smaller molecules in the blood are forced through the partially permeable membrane of the Bowman's Capsule. This is because the ...
JJ
Answered by Jacob J. • Biology tutor
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What is the role of mRNA in protein synthesis?

mRNA stands for messenger RNA. Essentially, once the strand of DNA is unwound and flattened, it is separated into its two strands. Then the bases on each DNA strand are read in groups of three. These are cal...
EC
Answered by Esthel C. • Biology tutor
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How do glucose and oxygen get into the blood to be used for respiration?

When we breathe we inhale oxygen from the air into our lungs. The alveoli are tiny air sacs in the lung where oxygen diffuses into the blood via small blood vessels, known as capillaries. The blood in these ...
AP
Answered by Anna P. • Biology tutor
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How is a root hair cell specialised to its function?

Root hair cells have a very large surface area due to them being very long and having hair like projections. This allows more active transport of mineral ions to take place so the plant is able to take in as...
EB
Answered by Emily B. • Biology tutor
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