The human endocrine system

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The endocrine system is composed of glands that secrete hormones directly into the bloodstream.
Hormones are large molecules. The blood carries the hormone to a target organ where it produces an effect. Compared to the nervous system the effects are slower but act for longer
The pituitary gland in the brain is a ‘master gland’. It secretes several hormones that act on other glands to stimulate other hormones to be released.
Adrenaline is produced by the adrenal gland. It boosts the delivery of oxygen and glucose to the brain and muscles and prepares the body for ‘flight or fight’
Thyroxine from the thyroid gland stimulates the basal metabolic rate. It plays an important role in growth and development.
The control of thyroxine levels involves negative feedback. Negative feedback tends to stabilise a system. Any change in the system leads to a response that tends to reverse the change

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The human endocrine system

Cards (6)

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1.2.2 The Human Respiratory System

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1.2 Circulatory System

3.2 Human Defence Systems

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Unit 2: Body Systems, Genetics, Microorganisms, and Health

7.1.1 Endocrine System

1.5 Human-Environmental Interaction

1.2 Respiration and the Respiratory System in Humans

3.2 Coordination and Control – The Endocrine System

a. System software:

2.2.1 Global Systems

1.5 Systems Software