Homeostasis and response- PAPER 2 Flashcards
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https://www.youtube.com/watch?v=Fm02i4vEi5Q
What is homeostasis?
maintaining a stable internal environment
What do receptors do?
detect a stimulus
What does the coordination centre do?
receives and processes information from the receptors and then organises a response
What do the effectors do?
Produce a response which counteracts the change
What is the optimum temperature for enzymes in the body?
37 degrees Celsius
How is body temperature controlled?
via negative feedback
What do temperature receptors do?
detect if the core body temp is too low or too high
What does the thermoregulatory centre do?
Receives info from temp receptors and triggers effectors
What does the body do if you are too hot?
- hairs lie flat
- sweat glands produce more sweat which is evaporated through the skin
- blood vessels dilate blood flows closer to skin and transfers energy to the environment
What does the body do if you are too cold?
- hairs stand up
- no sweat produced
- blood vessels constrict
- shiver
What are hormones?
Chemical messengers set in the blood
What does the pituitary gland do?
produces many hormones that regulate body conditions
What is the pituitary gland also know as and why is this?
master gland as it controls other glands
What does the thyroid do?
produces thyroxine which controls rate of metabolism, heart rate and temp
