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If gravity alone acts to retard the expansion and nothing acts to accelerate it, the Universe is said to be closed if
I.gravity is strong enough to stop the expansion in a finite time.
II.the density of the Universe is less than the critical density.
III.the Universe is finite.
Sodium-Potassium Pumps
Membrane proteins that pump sodium ions out of cells and potassium ions into cells, playing a key role in maintaining cell potential.
Potassium Ions
Essential ions for various physiological processes, including nerve transmission and muscle contraction, and maintaining fluid and electrolyte balance.
Sodium Ions
Positively charged atoms of sodium, crucial for nerve impulse transmission and fluid balance in the body.
Trigger Zone
The region of a neuron where an action potential is initially generated, typically located at the axon hillock.
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