b12: homeostasis in action Flashcards
(21 cards)
what is homeostasis
maintenance of a constant interval environment
give 3 internal conditions controlled in homeostasis
body temperature
blood glucose concentration
water levels
give 3 things all control systems include
receptors
coordination centers
effectors
where is body temperature monitored and controlled
thermoregulatory center in the brain
what happens if the body temperature is too high
blood vessels dilate and sweat is produced
what happens if the body temperature is too low
blood vessels constrict, sweating stops and shivering takes place
what is the function of the kidneys
filter and reabsorb useful substances from the blood
produce urine to excrete excess water ions and urea
how are excess amino acids excreted from the body
deaminated to form ammonia in the liver, ammonia is converted to urea and excreted
which hormone controls the water level in the body
ADH
how is kidney failure treated
organ transplant
kidney dialysis
in kidney dialysis what fluid is temporarily removed from the patients body
blood
in kidney dialysis name one substance that diffuses from the patients blood into the dialysis fluid
urea
waste products
define diffusion
the movement of particles from an area of high concentration to an area of low concentration
what are proteins broken down into
amino acids
amino acids are de-aminated to form ammonia in what organ of the body
the liver
what does ammonia need to be execreted safety
ammonia is toxic
state 2 things controlled by negative feedback in the body
blood glucose
water
thyroxine
where is the hormone adrenaline produced
adrenal glands
where is the hormone thyroxine produced
thyroid glands
what is the function of adrenaline
prepares the body for fight or flight
increases heart rate
what is the function of thyroxine
regulates how quickly the body produces energy
makes proteins
