B6

Question 1

Answer 1

Question 2

what are differences between inspired and expired air

Answer 2

inspired: higher o2 concentration, lower Co2 concentration

expired: higher CO2 concentration, higher water vapour, lower o2 concentration

Question 3

composition of inhaled air

Answer 3

79% nitrogen
21% oxygen
0.04% CO2
water vapour (variable)

Question 4

composition of exhaled air

Answer 4

79% nitrogen
16% oxygen
4% CO2
water vapour (saturated)

Question 5

how does physical activity impact rate depth breathing

Answer 5

increases

Question 6

explain differences in inspired and expired air

Answer 6

• CO2 increases because move from blood to lungs
• O2 decreases because move from lungs to blood
• water vapour increases because its by-product of respiration

Question 7

why does rate/depth of breathing increase in physical activity

Answer 7

• increased CO2 concentration in blood detected by brain
• increase to remove
• more need for O2 for respiration

Question 8

what are uses of energy in living organisms

Answer 8

• muscle contraction
• protein synthesis
• cell division
• growth
• passage of nerve impulses
• maintenance of constant body temp

Question 9

what is aerobic respiration

Answer 9

chemical reactions in cells that use oxygen to break down nutrient molecules to release energy

Question 10

what is anaerobic respiration

Answer 10

chemical reactions in cells that break down nutrient molecules to release energy without using oxygen

Question 11

how does energy release in (an)aerobic respiration compare

Answer 11

anaerobic releases much less energy per glucose molecule than aerobic

Question 12

what causes oxygen debt

Answer 12

lactic acid buildup in muscles and blood during vigorous exercise

Question 13

how is oxygen debt removed after exercise

Answer 13

• continuation of fast HR to transport lactic in blood from muscles to liver
• continuation of faster breathing to supply O2 for aerobic respiration of lactic acid
• aerobic respiration of lactic acid in liver