Topic 5: Homeostasis and Response Flashcards
what is homeostasis?
the control of internal body conditions
what are the factors in the body that must be kept constant?
- temperature
- blood glucose levels
- water levels
- ions
what is a stimulus
a change in the environment
what is the receptor and the stimulus for eyes?
receptor - light receptor
stimulus - change in light intensity
what is the receptor and the stimulus for the ears?
receptor - sound receptor
stimulus - change in sound waves
what is the receptor and the stimulus for the nose?
receptor - chemical receptor
stimulus - change in chemicals in the air
what are the receptors and the stimulus for the skin?
receptors - temperature/ pressure receptors
stimulus - change in temperature and pressure
what is the receptor and stimulus for the tongue?
receptor - chemical receptor
stimulus - change in chemicals in food/drink
what is a receptor?
detects the stimulus
what are effectors?
always a muscle or a gland
what are the 4 hormones in the body? what are the functions ?
what gland do they come from?
oestrogen - thickens the uterus lining - ovaries
FSH - matures the egg - pituitary gland
LH- causes ovulation - pituitary gland
progesterone - maintains the uterus lining - ovaries
what are the two types of diabetes?
what are the causes?
what are the treatments?
1 - genetic - injection of insulin
2 - obesity - exercising more, eat foods low in fats and carbohydrates
what is a hormone?
a hormone is a chemical messenger
what are the three neurones? what is the order?
sensory neurone
relay neurone
motor neurone
what are synapses?
gaps
