Summary AQA GCSE Biology Triple: Hormonal control

HORMONAL Biology Chapter 11
COORDINATION

, WHAT IS A HORMONE


• A hormone is a chemical messenger secreted by a gland that
travels through the blood to a target organ and brings about an
effect


• The endocrine system is a collection of glands that secretes
hormones and travels through the blood to the target organ to
trigger a response

, • The endocrine system:
• The endocrine system is made up of glands that s
hormones




1.1 THE Gland Role of hormone

PRINCIPLES OF Pituitary
gland
Controls growth in children
Stimulates thyroid gland
HORMONE Stimulates ovaries to produce and release eggs
Stimulates testes to make sperm
CONTROL Thyroid Controls metabolic rate of the body
Pancreas Controls levels of glucose in the blood
Adrenal Prepares body for stressful situations
Ovaries Controls the development of female secondary
sexual characteristics
Is involved in menstruation
Testes Controls the development of the male secondary
sexual characteristics

, • From your knowledge of hormones and
the table can you think of a hormone that
is secreted at each gland


STRETCH
• Remember that hormones travel through
the bloodstream


• What is the definition of a hormone