Cells are limited in size to maximize efficiency (accessing nutrients and getting rid of waste as well as decreasing the chances that information will become erred).
A cell with 2cm sides has a surface area of 2cm x 2cm x 6 = 24 cm^2
Volume would be 2cm x 2cm x 2cm = 8cm^3
Surface area : Volume = 24:8 or 3:1
A cell with a large volume will have more difficulty accessing nutrients and getting rid of waste quickly and transferring information that has no mistakes in it
Starting from the triggering action potential, the membrane potential in the neuron will propagate from the dendrites to the cell body then to the axons where synaptic vesicles are located. The action potential will trigger an influx of calcium into the axon then calcium will bind to proteins that will move the synaptic vesicles to the synaptic cleft. The membrane of the synaptic vesicles will eventually join the membrane of the synapse and then the neurotransmitters inside the vesicles will be "spilled" into the synaptic cleft.
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Biological membranes have three primary functions: (1) they keep toxic substances out of the cell; (2) they contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles and between the
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Maybe look up key words(vocab), review any notes or homework. Go over any old classwork.
