What is a gland?

A gland is an organ that releases small chemicals called hormones.

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What is a hormone?

A hormone is small chemical, released by a gland, that binds to a receptor on a target cell.

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How does the endocrine system work?

The endocrine system is a network of glands. 


Glands are organs that release small chemicals called hormones. These chemicals are typically released into the bloodstream, allowing them to travel around the body.


They can then bind to specific cells that have the correct receptors. This will bring about some change within the cells.

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What is a target cell?

A target cell is any cell that has the correct receptor for a particular hormone to bind to. 

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What is the pituitary gland?

The pituitary gland in the brain is known as the 'master gland'; it secretes several hormones into the blood in response to body conditions.


These hormones, in turn, act on other glands to stimulate other hormones to be released to bring about effects.

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Which hormone do the adrenal glands secrete?

Adrenaline.

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What is the role of adrenaline?

The role of the adrenal gland is to prepare the body for exercise. It does this by:


1Increasing heart rate.


2Increasing breathing rate.


3Increasing blood pressure.

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Which hormone does the thyroid gland secrete?

The thyroid gland releases thyroxine.

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What is the role of thyroxine?

To increase metabolic rate. It also plays a role in growth and development. 

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Which hormone does the pituitary gland release to stimulates the thyroid gland?

Thyroid stimulating hormone (TSH).

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Which hormone do the testes produce?

The testes produce testosterone.

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Which hormone do the ovaries produce?

Oestrogen (and progesterone). 

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