exam 2 Ch 18

Question 1

Carrying capacity of O2 in blood

Answer 1

20mL O2 / 100 mL blood
1L O2 / 5L blood

Question 2

O2 + hemoglobin

Answer 2

oxyhemoglobin

Question 3

hemoglobin with no O2

Answer 3

deoxyhemoglobin

Question 4

how much of the O2 is bound to hemoglobin in red blood cells

Answer 4

98%

Question 5

Loading portion of the curve for transport of oxygen in blood

Answer 5

High PO2
Saturation stays high even with large changes in PO2 (eg. in lungs)

Question 6

Unloading portion of the curve for transport of oxygen in blood

Answer 6

Low PO2
Saturation changes quickly with even small changes in PO2, allowing oxygen unloading to tissues (eg. in body tissue)

Question 7

Factors that affect hemoglobin saturation

Answer 7

Blood pH (more acidic, O2-Hb curve shifted to right)
Blood Temp (warmer, O2-Hb curve shifted to right)

Question 8

How much O2 binds to 1 g of hemoglobin

Answer 8

1.34 mL

Question 9

Anemia

Answer 9

lower hemoglobin content lower O2 capacity

Question 10

How is carbon dioxide transported in blood

Answer 10

as bicorbonate ions
dissolved in plasma
bound to hemoglobin (carbaminohemoglobin)

Question 11

Bicarbonate ion transport

Answer 11

transports 60-70% of CO2 in blood to lungs

Question 12

Dissolved carbon dioxide transport

Answer 12

7-10% of CO2 is dissolved in plasma

Question 13

Carbaminohemoglobin transport

Answer 13

20-33% of CO2 transported bound to Hb

Does no compete with O2-Hb binding

Question 14

Arterial O2 content

Answer 14

20 mL O2 / 100 mL blood

Question 15

How is O2 transported in muscle

Answer 15

myoglobin
Higher affinity for O2

Question 16

As blood flow increases what happens to the opportunity to deliver O2 to tissue

Answer 16

it decreases

exercise increases blood flow to muscle

Question 17

Where are respiratory centers located

Answer 17

brain stem (medulla oblongata, pons)