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As the action potenial reaches the synaptic terminal depolarisation causes voltage-gated Ca²⁺ channels to open. The opening of these ion channels causes an influx of Ca²⁺ ions be...

Cell wall:

Only present in plant cells, it provides structure and is completely permeable to biological molecules.

Cell membrane:

Much thinner than cell wall and is p...

Dominant alleles need the presence of only one copy to ach...

If body temperature is too high:

Capillaries dilate, increasing the blood supply to the skin and allowing heat to be lost from the body by radiation.

If body temperature is t...

Mitochondria are a fascinating organelle, which we, as humans, rely on for so much. They are where the electron transport chain occurs, where ADP is conv...