week 5 quiz

Question 1

what is negative pressure breathing? (inhalation)

Answer 1

• to get air in, need to lower air pressure and create gradient
  *lower air pressure relative to outside
  *contracts 2 muscles that expands thoracic cavity to lower air pressure:
  1)rib cage muscles
  2)diaphragm

Question 2

what are the respiratory pigments?

Answer 2

1) hemoglobin(protein)->based on iron, binder & deliverer of oxygen
2) hemocyanin: copper-based pigment found in arthropods & mollusks

Question 3

what is cooperative binding?

Answer 3

proteins shape change for transport for easier binding and do so each time the shape changes

Question 4

what is the dissociation curve?

Answer 4

small change in partial pressure causes large change in delivery of O2

Question 5

what is the bohr shift?

Answer 5

*shows hemoglobin is more willing to give up oxygen to cells
*CO2 made in cellular respiration lowers blood pH * lowers affinity of hemoglobin for O2

Question 6

oxygen dissociation curve & body size relation?

Answer 6

*smaller bodied creatures-> need oxygen delivered more readily, lower affinity for oxygen
*larger bodied creatures-> higher affinity

Question 7

oxygen dissociation curve for fetus & mother?

Answer 7

fetus has higher affinity because it only gets oxygen depleted of normal amount by mother