Animal coordination, control and homeostasis (Topic 7) Flashcards
What are the chemicals called which glands release
Hormones
Where are the chemicals from the glands released into
The blood stream, which allows them to travel round the body
What must a cell have for a hormone to stimulate it
The correct receptors for the specific cell
What is the role of thyroxine
To regulate metabolism / metabolic rate
What happens if the level of thyroxine in the blood is to low
The pituitary gland will release more TSH (thyroid stimulating hormone)
TSH stimulates the thyroid gland to produce thyroxine
thyroxine then inhibits the production of TSH
What happens if the level of thyroxine in the blood is too high
Thyroxine will inhibit the pituitary gland from producing TSH.
Less TSH means the thyroid gland won’t release as much thyroxine
so the levels will fall back down to normal
The control of thyroxine levels is an example of what type of feedback
Negative feedback
What organ is insulin released from
The pancreas
Where is adrenaline produced from
The adrenal glands
When is adrenaline produced
During the ‘fight or flight’ response. It prepares the body for activity
What does adrenaline do
- Increases heart rate
- Increase blood pressure
- Increases blood flow to muscles
- Increase blood sugar (glucose) levels by stimulating the liver to break down glycogen into glucose
When is adrenaline released
When your scared
Where is thyroxine produced
In the thyroid gland
What does thyroxine do
- Growth and development
- increase metabolic rate
Examples of secondary sexual characteristics
- Deepening voice
- Increase in height
- Breast development
- More muscle mass
