B12 homeostasis in action

Question 1

thermoregulatory centre

Answer 1

in hypothalamus controls core body temp
contains receptors

Question 2

cooling down

Answer 2

vasodilation occurs
more energy transferred from skin to surroundings
sweat more- transferring energy

Question 3

keeping warm

Answer 3

vasoconstriction
sweat less- less energy transferred
shivering by exothermic muscle contractions so energy raises body temperature
erect body hairs trap layer of air around them

Question 4

carbon dioxide

Answer 4

produced in respiration, acidic when dissolved
would effect working of enzymes
diffuses out of cells down conc gradient from blood to alveoli
removed during exhalation as well as water

Question 5

urea

Answer 5

breakdown of amino acids in liver
poisonous substance, build up causes cell damage
filtered out of blood by kidneys
removed in urine

Question 6

deamination

Answer 6

liver removes amino group from amino acids
forming ammonia, toxic
converted into urea before excretion
amino acid molecule used in respiration or to make other molecules

Question 7

maintaining mineral and water balance

Answer 7

water leaves in exhalation
lost through skin in sweat
excess lost via kidneys in urine(controlled)
also removes urea

Question 8

kidneys

Answer 8

filters blood and reabsorbs all glucose as well as needed water/minerals
excess removed via urine
selective reabsorption
water balance maintained by adh

Question 9

adh

Answer 9

less ADH-more urine, less reabsorption
more ADH- less urine, more reabsorption