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Explain why an athlete, who has just run a marathon on a summers day, would have higher concentration of ADH (anti-diuretic hormone) in their blood.

The athlete is running a marathon, therefore their muscles are constantly contracting and therefore using up ATP (Energy). ATP is generated through respiration in cells in the human body. Respiration generat...
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Answered by Aryan N. • Biology tutor
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Explain DNA replication (SL).

DNA replication is the process through which two new strands of DNA are synthesized from the original molecule and predominantly occurs in the S phase of the cell cycle prior to mitosis. To put it simply, we...
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Answered by Jordi M. • Biology tutor
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Describe the consequences of base substitution mutation with regards to sickle cell anaemia

In every gene, a sequence of three nucleotide bases will code for an amino acids, many of which form a protein. Within the normal gene for haemoglobin, the sequence of bases will code to produce amino acids ...
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Answered by Charlotte R. • Biology tutor
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Explain how ADH helps to maintain water homeostasis in humans.

ADH (antidiuretic hormone) is a hormone that targets the kidney. It triggers the insertion of aquaporins into the walls of the collecting duct. When the water concentration in the body is too low (high osmol...
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Answered by Sophie P. • Biology tutor
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Explain the reasons why communication between cells is essential in the human body. Use examples to illustrate your answer.

Communication is a process that involves the transfer of a signal/information from one cell to another. The main reason this has arisen between cells comes down to the basic component that makes up a human b...
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Answered by Magnus Y. • Biology tutor
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