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Homeostasis Notes
11/05/2023
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+ Topic 5 HOMEOSTASIS The regulation of conditions inside the body + Stimulus R eceptor + + Sensory neurone R clay neurone Motor neurtine E flector Response - - muscles or glands FC the connection between two neurons is the synapse nerve impuises travel along the nerve when it reaches the end, it is transferred by chemicals that diffuse across the gap this then sets off the electrical signal in the next neuron. you 323 1 2 Cerebral cortex Medulla Berebellum 3 4 spinal cord - 1 Consciousness, intelligence, memory Unconscious activity eg. breathing Muscle coordination 7.7 iris 78 + cornea pupil ciliary muscles - iris reflex 1 bright light ALSO Circular muscles Contract lens Close up • ·sclera suspensory ligaments 1 retina optic nerve Ciliary contract fatter lense increases refraction dim light radial muscle Contract far away 7 . SL Contracts thin lense Tess refraction - 4 concave and convex convex - longsighted hyperopia + Body Temperature HOT sweat produced blood vessels . " 'vasodilate' transfer heat energy away + Hormones + H Thyroid Pituitary gland Ovanes/Testes oestrogen Thyruxine a Testosterone Pancreas •Goncave shortsighted - myopia COLD. hair stands up to trap air vasoconstriction' shivering to generate heat Adrenal grana Adrenaline Insulin beleased 79 BLOOD GLUCOSE When blood glucose is too high Glucose Insulin Glycogen + When blood glucose is too low Glucagon Glycogen Glucore Diabetes = Type 1, the pancreas produces little or no insulin. Insulin injections etc. Type 2, the person becomes resistant to their insulin, obesity is main factor, can be reversed... + Kidneys, filters to clean the blood with selective reabsorption 1 Urea, proteins that can't be stored are broken down, accurs in the liver (process of useful removal) 2 Ions, absorbed into blood 2 3 water, amount present in brody controlled by hidneys water too high Brain Pituitary gland releases Less ADH SO Tess absorption water decreases water incitases Water too LOW Brain Pituitary gland releases more ADH SO more absorption + Menstrual cycle - Day 1 - lining breaks down - Day 4 Dug 4 - lining builds up - Day...
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Alternative transcript:
14 -Day 14 - egg released. -Day 28 - wall maintained 81 + 2 N ~ ~ 2 N N ~ Fertility - preventing ~ destrogen pills progesterone pills implant injection of progesterone 100 ( hili's sperm) FSH LH 4 - matures egg releases egg Destrogen grows lining. Progesterone - maintains lining condoms diaphragm spermicide Sterilisation abstinence. 14 - IVE invitro fertilisation 28 + Adrenaline & Thyroxine -Adrenaline adrenal gland ~ fight or flight ~ increases neart-rate and crygen to ine brain C N Thyroxine ~Thyroid gland abs -requiates metabolic rate stimulus protein synmesis + Plant Hermenes - Auxin ~phere tropism + gravitropism ~ gravity wes include weed hillert • grawing from cuttings growing in cell tissue culture. 1 183 १५ Gibberellins Controls seed darmaney induce flowering growing large fruit ~ 2 Ethene a gas produced by aging parts of plants centrals cell divisionLENIKE ripens fruit by centraling enzymes