Homeostasis Flashcards
Heat levels too high (Homeostasis)
Blood vessels carrying blood to skin capillaries dilate. Heat energy is transferred from skin to environment
Swear produced by sweat gland evaporation of sweat transfers energy to the environment
Temperature too low
Blood capillaries vasoconstrict
So less heat energy is transferred
Skeletal muscles contract causing shivering
Respiration releases heat
Removal of waste products process ( protein broken down )
Protein digests into amino acids
Excess amino acids are deaminated into ammonia
Ammonia converted into urea for safe excretion
Uncontrolled losses of waste products
Exhalation
Sweating loses water,ions
Controlled losses of waste products
Excess water, ions and urea removed by kidneys in urine
What happens if body cells lose too much water by osmosis
They won’t function properly
Kidney function (maintain…)
Maintain homeostasis through control of levels of water through nitrogenous waste
What does the kidney do
Remove urea from blood
Maintain water balance by removing excess water
Maintain mineral ion balance by removing excess mineral ions
Kidney filtration out of the blood
Kidneys filter all of your blood
Glucose,mineral ions,amino acids,urea and water move into kidney tubules
Blood cells too big to pass through membrane of tubule so they stay behind
Re absorption back into blood
ALL glucose and amino acids are reabsorbed by active transport against a conc. gradient
water is selectively reabsorbed by osmosis depending on body’s needs
Mineral ions selectively reabsorbed
Negative feedback decrease
Blood water concentration decreases
More ADH released by pituitary
Kidney tubules reabsorb more water-less urine produced
Water conc increases back to normal
Negative feedback increase
Blood conc increase
Less ADH released by pituitary
Kidney tubules reabsorb less water l- more urine
Blood water conc decreases back to normal
SELECTIVE RÉABSORPTION
ALL glucose by active transport
ALL amino acids by active transport
Some mineral by active transport
Some water by osmosis
Homeostasis
Maintenance of a constant internal environment
Thermorégulateur centre définition
Monitors and controls core body temp
