Negative Feedback and Thyroxine Flashcards

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Where in the body is thyroxine made?

Thyroxine is made in the thyroid gland in the neck.

What is the main job of thyroxine in the body?

Thyroxine controls the body’s metabolic rate, which means how fast chemical reactions happen in cells.

What does metabolic rate mean?

Metabolic rate is the speed at which the body uses food to release energy and make new substances.

Which hormone from the pituitary gland controls how much thyroxine is released?

Thyroid-stimulating hormone (TSH) from the pituitary gland controls how much thyroxine is released.

What is negative feedback in hormone control?

Negative feedback is when a change triggers a response that brings a level back to normal.

Why is negative feedback used to control thyroxine levels?

Negative feedback keeps thyroxine levels close to normal so that metabolic rate stays steady.

What happens to TSH levels when thyroxine in the blood is too low?

When thyroxine is too low, the pituitary gland makes more TSH, which tells the thyroid to make more thyroxine.

What happens to TSH levels when thyroxine in the blood is too high?

When thyroxine is too high, the pituitary gland makes less TSH, so the thyroid makes less thyroxine.

How does a high level of thyroxine affect metabolic rate?

A high level of thyroxine makes the metabolic rate faster, so cells use more energy.

How does a low level of thyroxine affect metabolic rate?

A low level of thyroxine makes the metabolic rate slower, so cells use less energy.