IB SEHS - Midterm Exam 2025
Questions and Answers
Why might a doctor be interested in assessing VO2 in an exercise test? - ANSWER✔✔--
VO2 is the amount of oxygen a person takes in during exercise.
-This might be interesting to assess to a doctor because it helps them understand the
oxygen going to the blood during physical activity.
-It shows how effective the lungs, heart blood flow, and muscles are working with each
other.
how does oxygen transfer from blood to muscles? - ANSWER✔✔-the concentration of
oxygen in the muscle will be lower in the muscle than in the blood, so the oxygen will
transfer to the muscle through diffusion
Describe the process of breathing and comment on how exercise affects this process. -
ANSWER✔✔--diaphragm pulls downward on the lungs and allows for more room
inside the lungs to take in oxygen from high to low pressure
-after the gas exchange, the diaphragm relaxes, pushing out the carbon dioxide a body
has produced after taking in oxygen to an environment of lower pressure
, -exercise is a very important part of this process because it requires more oxygen to be
delivered to the blood.
-the diaphragm is required to contract and relax faster to allow for more oxygen in the
body and bloodstream to the muscles
how does co2 transfer from blood to lungs? - ANSWER✔✔-the concentration of CO2 in
the alveoli will be lower than the concentration of CO2 in the blood, so CO2 will diffuse
from the blood to the alveoli to be removed from the body via the lungs
how does co2 transfer from muscles to blood? - ANSWER✔✔-because there's a lower
concentration of co2 in the blood stream, co2 will diffuse from the muscle into the blood
to be carried to the alveoli
how does oxygen transfer from the lungs to the blood? - ANSWER✔✔-the blood has a
lower concentration of oxygen than the alveoli, so oxygen diffuses from the alveoli into
the bloodstream to be taken to the muscles
hemoglobin - ANSWER✔✔-pigment that binds oxygen for transport in the blood, found
in red blood cells
hamstring muscles - ANSWER✔✔-biceps femoris, semitendinosus, semimembranosus
(3)
quadricep muscles - ANSWER✔✔-rectus femoris, vastus lateralis, vastus medialis,
vastus intermedius (4)
Questions and Answers
Why might a doctor be interested in assessing VO2 in an exercise test? - ANSWER✔✔--
VO2 is the amount of oxygen a person takes in during exercise.
-This might be interesting to assess to a doctor because it helps them understand the
oxygen going to the blood during physical activity.
-It shows how effective the lungs, heart blood flow, and muscles are working with each
other.
how does oxygen transfer from blood to muscles? - ANSWER✔✔-the concentration of
oxygen in the muscle will be lower in the muscle than in the blood, so the oxygen will
transfer to the muscle through diffusion
Describe the process of breathing and comment on how exercise affects this process. -
ANSWER✔✔--diaphragm pulls downward on the lungs and allows for more room
inside the lungs to take in oxygen from high to low pressure
-after the gas exchange, the diaphragm relaxes, pushing out the carbon dioxide a body
has produced after taking in oxygen to an environment of lower pressure
, -exercise is a very important part of this process because it requires more oxygen to be
delivered to the blood.
-the diaphragm is required to contract and relax faster to allow for more oxygen in the
body and bloodstream to the muscles
how does co2 transfer from blood to lungs? - ANSWER✔✔-the concentration of CO2 in
the alveoli will be lower than the concentration of CO2 in the blood, so CO2 will diffuse
from the blood to the alveoli to be removed from the body via the lungs
how does co2 transfer from muscles to blood? - ANSWER✔✔-because there's a lower
concentration of co2 in the blood stream, co2 will diffuse from the muscle into the blood
to be carried to the alveoli
how does oxygen transfer from the lungs to the blood? - ANSWER✔✔-the blood has a
lower concentration of oxygen than the alveoli, so oxygen diffuses from the alveoli into
the bloodstream to be taken to the muscles
hemoglobin - ANSWER✔✔-pigment that binds oxygen for transport in the blood, found
in red blood cells
hamstring muscles - ANSWER✔✔-biceps femoris, semitendinosus, semimembranosus
(3)
quadricep muscles - ANSWER✔✔-rectus femoris, vastus lateralis, vastus medialis,
vastus intermedius (4)
