Examlex
The ________ directly controls the secretion of epinephrine and norepinephrine by the adrenal glands.
Freshwater Organism
A living entity that inhabits water bodies with low salt content, such as lakes, rivers, and ponds.
Semipermeable Membrane
A membrane that allows the passage of certain small molecules or ions but blocks others.
Concentration Gradient
A variation in the concentration of a substance across a distance, often leading to the diffusion of substances from an area of higher concentration to an area of lower concentration.
Diffusion
Spontaneous spreading of molecules or atoms through a fluid or gas.
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