Thyroxine and Metabolic Rate Flashcards

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What is thyroxine?

Thyroxine is a hormone made by the thyroid gland that helps control the body’s metabolic rate.

Which gland makes thyroxine and where is it found in the body?

The thyroid gland makes thyroxine. It is found in the neck, in front of the windpipe.

What is meant by metabolic rate?

Metabolic rate is how fast chemical reactions happen in the body, especially respiration in cells.

How does thyroxine affect metabolic rate in body cells?

Thyroxine makes cells carry out respiration faster, so it increases the metabolic rate.

How does a higher metabolic rate affect energy use in the body?

A higher metabolic rate means cells release more energy each second and use more oxygen and glucose.

What might someone feel like if their thyroxine level is too low?

They may have a low metabolic rate, feel tired, gain weight and feel cold.

What might someone feel like if their thyroxine level is too high?

They may have a high metabolic rate, lose weight, feel hot and may have a fast heartbeat.

Why is it important for the body to keep a suitable metabolic rate?

It makes sure enough energy is supplied for movement, growth, repair and keeping body temperature steady.

Which types of body cells are most strongly affected by thyroxine?

Heart cells and muscle cells are strongly affected, as they use a lot of energy.

How does thyroxine help growth and development in children?

Thyroxine keeps metabolic rate high enough for cells to grow, divide and develop properly.