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Special cells make a patch in the right atrium known as the sino-atrial node (SA node), these cells can depolarise themselves! When these cells depolarise, they cause depolarisation of cells nearby, these...
The lungs are highly specialised. They have alveoli which are small air sacs. Alveoli give the lungs a big surface area, meaning that more oxygen can diffuse from the lungs into the blood stream, and more...
A cytoskeleton is a structure that acts as a support for the cell. It also maintains the cell shape, holds and moves organelles. It is made from a fibre network dispered in the cell cytoplasm, attached in...
When blood glucose concentration rises above its optimum level of 90mg/100cm3, it is detected by β-cells in the Islets of Langerhans in the pancreas. These β-cells release insulin into the bloo...
Alpha cells in the islets of Langerhans (pancreas)
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