PNB 2XB3 Questions and Answers | Latest Update 2024/2025
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Module
PNB 2XB3
Institution
PNB 2XB3
Neuroscience
~~> study of the neurons and nervous systems
how many neurons are in the brain and what is the power of the brain
~~> 100 billion neurons, and it is about 20W
how large are neurons
~~> 10 microns
Central Nervous System (CNS)
~~> all the parts within bone (spinal ...
✓ ~~> aqueous saline solution surrounding neurons that contains sodium,
potassium, chloride, and other ions in solution
neuronal membrane
✓ ~~> impermeable to the movement of ions, but ions can cross by
either ion transporters and ion channels
Ion transporters
✓ ~~> active transporters (enzymes) that use energy to actively move
selected ions against concentration gradients to create ion
concentration gradients
Ion channels
✓ ~~> do not use energy and they allow ions to diffuse down a
concentration gradient and are selectively permeable to only certain
ions
sodium potassium pump
Master01 | September, 2024/2025 | Latest update
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