Physiology · Digestive System · Easy

Pepsin

Meaning: A protein-digesting enzyme active in the acidic environment of the stomach.

In practice: Pepsin begins breaking dietary proteins into smaller peptides in the stomach.

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Two questions on related physiology words.

Which word means: Movement of molecules from high to low concentration without energy.

Which word means: The thick filament protein in muscle whose heads pull on actin to produce contraction.

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