B12 - Homeostasis in Action Flashcards
What is the thermoregulatory centre?
part of brain - controls body temp via blood & nerves
How does the skin work with the brain to control temperature?
elctrcl impulses down snsry neurones -> thrmrgltry cntr
What happens if your body temperature is too high? How can your body cool itself down by sweating?
- sweat glands release sweat on surface of skin
- swear evapourates & takes heat energy from body = cools down
What happens if your body temperature is too high? How can your body cool itself down by flushing?
- blood vessels, supplying skin blood capillaries, dilate (vasodilation)
- more blood flows through capillaries
- heat lost by radiation
What happens if your body temperature is too low? How can your body warm itself up by vaso constriction?
- blood vessels, supplying skin blood capillaries, constrict
- reduces blood flow through capillaries
- reduces energy lost by radiation
Which organ maintains the water & mineral levels?
kidneys
What happens if the blood becomes too dilute?
H2O moves -> cells by osmosis
What happens if the blood becomes too concentrated?
H2O move out of cells by osmosis
What are the 3 ways that the body loses water?
- water vapour when exhlng
- sweat
- urine
Other than water, what else is lost through the skin via sweat?
ions & urea
What is the first step of the kidneys making urine?
C6H12O6, mineral ions, urea & H2O is filtered out of the blood and into the nephron by diffusion
What is the second step of the kidneys making urine?
blood cells & proteins stay in blood as they are too big
What is step 3 of the kidneys making urine?
ALL glucose is reabsorbed into blood by diffusion & active transport
What is step 4 of the kidneys making urine?
amnt of H2O & ions that are reabsorbed varies = selective reabsorption
H2 reabsorption is cntrlld by hrmns
What is step 4 of the kidneys making urine?
urea, excess H2O & mineral ions are collected producing urine trnsprtd -> bladder
