homeostasis Flashcards
what is homeostasis
1)regulation of cells or organisms
2) to maintain optimum conditions for function
3) in response to internal or external conditions
reflex arch (corfirm with mrs homespeirce)
stimulus
receptor cells
sensory
relay
motor
effectors
what is the function of receptor cells?
detect changes in the environment
(stimulus)
(environment could mean internal/external body conditions)
coordinating center function
process information from receptor cells
3 examples of co ordination centers
brain
pancreas
spinal cord
name for changes in the environment given by scientists
stimulus
effectors example
muscle and glands
job of effectors
carry out a response from the coordinating center
restore optimum conditions
what is a synapse?
the junction at the end of a sensory neuron
the independent variable in reaction time practical
the person having their reaction time tested.
(effect of practice)
(chemicals affect reaction time-caffeine)
what transports hormones
blood
key differences between the endocrine and nervous system
1) nervous- electrical impulses that travel down neurons
hormones-chemicals carried around in the bloodstream
2)signals extremely fast in but the effects are short term
endocrine-produce at a much slower effect and is long-lasting.
6 key glands
pituitary gland
adrenal gland
thyroid
pancreas
ovaries-females
testes-male
the function of the pancreas in the endocrine system
release hormones that are involved in controlling the concentration of glucose in the blood
the function of testes and ovaries in the endocrine system
release hormones involved in puberty and reproduction
thyroid gland function
release hormones involved in growth
and regulating the body’s basal metabolic rate
adrenal gland function
produce hormone adrenaline
which is produced in times of fear or stress
pituitary gland
AKA master gland
releases a number of hormones in the blood depending on the condition
the function of pituitary hormones
act on other glands and they cause other hormones to be released
the process by which eggs are released from an ovary
ovulation
the function of the hormone oestrogen
stimulate growth of the uterus lining
stages of the menstrual cycle graph
stage 1; menstruation, breaking down of uterus lining days 1-4
stage 2; lining starts to build up again on days 4-14
stage 3; ovulation, egg is released 1 day
stage 4)maintaining of uterus lining
what hormone does the increase of hormone oestrogen inhibit?
follicle-stimulating hormone (FSH)
function of progesterone
maintaining the lining of the uterus
