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Biology
A Level

How does osmoregulation occur in the kidney?

The tubule fluid enters the collecting duct (CD) where the final water reabsorption occurs before the fluid is excreted as urine. Osmoreceptors in the hypothalamus detect the concentration of the blood (w...

Answered by Kelly D. • Biology tutor
5987 Views

How do phospholipids form membranes?

Phospholipids are a major component of cell membranes. They are ideal components of membranes due to their structure. They consist of a glycerol and phosphate 'head' attached to t...

Answered by Lauren E. • Biology tutor
13115 Views

How does increasing temperature affect the rate of a reaction in the presence of an enzyme.

Initially increasing temperature will increase the rate of reaction. This is because the substrate molecules have greater kinetic energy so there are more frequent collisions with the enzyme/other molecul...

Answered by Cameron R. • Biology tutor
2124 Views

Describe the cardiac cycle, including the role that valves and pressure differences play in this process.

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