Physiology · Endocrine System · Medium

Hormone

Meaning: A chemical messenger secreted by a gland that travels in the blood to target organs.

In practice: Cortisol is a hormone released during stress to mobilise energy.

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Two questions on related physiology words.

Which word means: A gas absorbed in the lungs and carried by haemoglobin to every cell in the body.

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

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