Homeostasis And Response Flashcards
(20 cards)
What is oestrogen
From Ovaries, Inhibits FSH Release Stimulates LH Release, allows lining of uterus
What is Progesterone
From Pituitary Glands, Stimulates release of egg from ovary
Keeps uterus lining thick
What is FSH
From pituitary glands , causes eggs to mature in ovaries stimulates ovaries to produce oestrogen
What is LH
From pituitary gland, stimulates release of egg from ovaries
Oral contraception (pill)
Contains oestrogen and progesterone inhibits FSH production so that no eggs are released
Barrier methods
Condoms prevents sperm reaching egg for fertilisation
Increasing fertility (IVF)
1) Giving woman FSH + LH to stimulate the growth of many eggs
2) Collecting the eggs from the woman
Fertilising the eggs with sperm from the father in the lab
3) inserting embroyos into the womb
STRESSFUL , NOT HIGH SUCCESS , LEAD TO MULTIPLE BIRTHS
Drawbacks of IVF
Not high success rate
Emotionally + Physically awful
Negative Feedback
1) A Receptor detects a change in a stimulus
2) The Coordinating Centre compares the stimulus to a set point
3) An effector then produces a response to correct a difference from the set point
What do receptors do
Detective change in stimuli
How Nervous System Operates
1) The Pain Stimulus is detected by receptors
2) Impulses from the receptor pass along a sensory neurone to the CNS
3) An Impulse then passes through a relay neurone
4) A Motor neurone carries an impulse to the effector
5) The effector responds I.e : contracting
What are gaps between neurones called
Synapses - chemical diffuse across
Type 1 Diabetes
Pancreas fails to produce sufficient insulin
High blood glucose levels
Treated with insulin injections
Type 2 Diabetes
Body cells no longer respond to insulin
Risk factor : Obesity
Carb controlled diet + excercise
If Blood glucose conc low
Pancreas releases glucagon
Glucagon stimulates glycogen to be converted into glucose and released into blood
If the Blood Glucose conc high
Pancreas releases more insulin
Insulin causes glucose to move from blood to cells
In liver + muscle cells excess glucose is converted to glycogen for storage
Low Thyroxine Levels
Hypothalamus release TRH , causes pituitary release TSH so releases more thyxorine so blood levels return to normal
Pituitary gland detects increased level of TSH prevents TSH from releasing more hormones
Menstrual Cycle Process
1) FSH released by pituitary gland - travels to ovaries causing egg to mature triggers egg to make oestrogen
2) oestrogen cause lining of uterus to become thick and inhibits FSH production
3) pituitary gland releases LH , triggering ovulation - ovary now produces progesterone
4) progesterone - stops pituitary gland releasing FSH + LH preventing more eggs from releasing - keeps lining thick
5) No sperm progesterone levels fall uterus lining + egg released (PERIOD)
What is a conscious response
Signal travels to brain then signal sent to effector
What is a reflex
Signal bypasses brain goes straight to effector through spinal cord. Faster
