Homeostasis * Flashcards
(30 cards)
Where is oestrogen produced from
The ovaries
What does oestrogen do
controls puberty and is one of the main hormones in the regulation of the menstrual cycle.
Blocks FSH and stimulates LH
Where is adrenaline produced from
The 2 adrenal glands
Where are the adrenal glands in the body
Above the kidneys
What does the pancreas produce
Insulin and glucagon
What does insulin and glucagon so
Regales blood glucose levels
What do the testes produce
Testosterone which controls puberty and sperm production
What do the thyroids produce
Thyroxine and is found in the neck
What do thyroxine do
regulates our metabolism, heart rate and temperature.
What is the endocrine (hormonal)system
Triggers a slower response.
Uses chemical messengers that are carried by blood.
Response can be long-lasting.
Can act on large areas of the body.
What is in the control system
Receptor cells (detect changes in the environment) Coordination centres (process information) Effectors (muscles or glands that bring about a response).
What does the central nervous system
Triggers rapid response.
Uses electrical signals that are carried by neurones.
Response is very short.
Acts on a very precise part of the body.
What are hormones
Chemical messagers
What are hormones released by
Endocrine glands directly into the bloodstream
How is the endocrine system different from the central nervous system?
The endocrine system coordinates the body’s response to environmental changes using chemical messengers (hormones).
The central nervous system uses electrical impulses.
True or false
The endocrine system triggers a faster response than the nervous system.
FALSE
The endocrine system triggers a slower response than the nervous system.
What does thyroxine increase
The basal (resting) metabolic rate
What is thyroxine regulated by
A negative feedback loop
What happens when the concentration of thyroxine in the blood is low
The hypothalamus (in the bran) produces TRH
What happens when thyroxine levels are too high
The production of TRH is reduced
What are the features called that appears during puberty
Secondary sex characteristics
What are the 4 key hormones that controls the mental cycle
Follicle Stimulating Hormone (FSH)
Oestrogen
Luteinising Hormone (LH)
Progesterone
What does FSH do
It is released by the pituitary gland and causes an egg in the ovary to mature.
FSH also stimulates (encourages) the production of oestrogen.
What does LH do
LH is produced by the pituitary gland and stimulates the release of a mature egg on Day 14 of the menstrual cycle.
This release is called ovulation.
