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Biology
IB

Describe how a nerve impulses crosses a synapse in the nervous system.

A synapse is a junction or space between two neurons or a neuron and a receptor which allows the transmssions of an electrical or chemical signals to another cell. The first neuron is called the presynapt...

HC
Answered by Harriet C. Biology tutor
22155 Views

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 gene...

AN
Answered by Aryan N. Biology tutor
5800 Views

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,...

JM
Answered by Jordi M. Biology tutor
2223 Views

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 aci...

CR
Answered by Charlotte R. Biology tutor
17929 Views

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 (...

SP
Answered by Sophie P. Biology tutor
12841 Views

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