BIO202H5 Lecture Notes - Lecture 8: Leptin, Hydrophile, Photoperiodism

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13 Mar 2016
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When it reaches the synaptic terminal it releases vesicles (neurotransmitter) into the synaptic cleft. The neurotransmitter is a key to open an ion channel that instigates the depolarization activity that may cause an action potential. Input of calcium comes from the action potential reaching the synaptic terminal. Any cell can be slightly depolarized but neuron cells are special because once they have reached the depolarization threshold, voltage-gated channels of sodium are opened: this depolarizes the inside of the cell membrane o. Depolarization of a cell membrane is the key to how all animals interpret their external cues. The light that is hitting the eye is interpreted in the back of the retina where all the pigment receptors are. Cones important for how we see colour they are active in different wavelengths of light. Rods are very sensitive in dim light good at helping you see in dimmer light.

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