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How does Cholera work?

Cholera works by releasing a toxin in the lumen. It causes chloride channels of the intestinal epithelial cells to open which in turn causes cholride ions to move along its concentration gradient into the lu...
TK
Answered by Tanvi K. • Biology tutor
7106 Views

Explain how change in blood flow to a runner's muscles helps him to run.

An increase in blood flow to the skeletal muscles means that more glucose and oxygen is delivered to the muscles via the blood. These are both needed in aerobic respiration to produce ATP/ energy for muscle ...
SW
Answered by Susannah W. • Biology tutor
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Describe three ways in which the body maintains its temperature in different climates

The temperature of the body is detected by the thermoregulatory centre in the hypothalamus in the brain, which can detect the temperature of the blood. Therefore it recieves information about changes to the ...
VW
Answered by Victoria W. • Biology tutor
4630 Views

Describe the way in which the normal heart beat is initiated and controlled

The heart muscle is myogenic , which means that it can contract without any input from the nervous system. The stimulus for the muscle to contract originates from a group of specialised cardiac cells, the si...
SS
14561 Views

Describe the process of breathing out.

Firstly, the intercostal muscles contract. This causes the ribcage to move upwards and outwards. The diaphragm also contracts. This all has the combined effect of increasing the volume of the lungs. As a res...
JZ
Answered by Julia Z. • Biology tutor
5657 Views