The Passive Movement of a Substance Along Its Concentration Gradient

question 30

Multiple Choice

The passive movement of a substance along its concentration gradient is termed:

• A) active transport.
• B) dialysis.
• C) diffusion.
• D) exocytosis.
• E) osmosis.

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Definitions:

Semicircular Canals

Structures in the inner ear that are part of the vestibular system, helping to maintain balance by sensing head rotation.

Otoliths

Small calcified structures found in the inner ears of vertebrates, important for balance and hearing.

Rod Photoreceptors

Cells in the retina of the eye responsible for vision in low light conditions.

Rhodopsin

Light-absorbing molecule in rod cells and cone cells that contains a pigment and the protein opsin.