Homeostasis and response- PAPER 2 Flashcards
(25 cards)
If come across this card click and watch video (reaction times)
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
What does the adrenal gland do?
produces adrenaline which prepares body for fight or fight response
What does the ovaries do?
produces oestrogen which is involved in menstrual cycle
What does the pancreas do?
produces insulin which is used to regulate blood glucose level
What does the testes do?
produces testosterone which controls puberty and sperm production
What controls blood glucose levels?
Insulin and Glucagon
How do you remove glucose from your blood?
- metabolism of cells
- vigorous exercise
How do you remove glucose from your blood?
- metabolism of cells
- vigorous exercise
What are auxins and what do they control?
Plant hormones that control growth near the tips of shoots or roots in response to phototropism and geotropism
How do auxins help shoots grow towards the light?
accumulate on the shaded side which make the cells grow faster and bend towards the light
