BIO 253L Final UNC Exam Questions With Verified Answers
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Course
Bio 253
Institution
Bio 253
BIO 253L Final UNC Exam Questions With
Verified Answers
What changes would you predict in your measurements of depth and rate of respiration if your
airways decreased in radius? - answerIf the airways decreased in radius, the depth and rate of
respiration would increase. Decreasing the radius o...
BIO 253L Final UNC Exam Questions With
Verified Answers
What changes would you predict in your measurements of depth and rate of respiration if your
airways decreased in radius? - answer✔✔If the airways decreased in radius, the depth and rate of
respiration would increase. Decreasing the radius of airways will increase the resistance of the
airways. Because of increased resistance the flow of the air will slow down and the body will not
move air as efficiently. The body compensates by breathing deeper at a faster rate.
Describe what is happening to the relative concentration of oxygen in the pulmonary veins when
you hold your breath? - answer✔✔There will be a decrease in the concentration of oxygen in the
pulmonary veins. When we inhale, oxygen is brought into the lungs which is then absorbed into
the blood and carried throughout the body. What remains is CO2, which is carried back into your
lungs by the circulating blood and released when we exhale. When our breath is held, CO2
accumulates in the cells, and the relative concentration of oxygen will decrease.
How does the pulse rate change during the breathing cycle? Describe the mechanisms that lead
to the change. - answer✔✔During a breathing cycle, air is moved in and out of the lungs via bulk
flow.
respiratory muscles change the shape and volume of the chest cavity that cause air movements in
breathing
The heart rate varies with respiratory pattern- faster with inspiration, slower with expiration.
Negative pressure in the chest during inspiration draws blood from lower extremities, causing
increase in blood returning to right atrium. Heart rate speeds up to circulate this extra blood.
Respiratory sinus arrhythmia helps to match pulmonary blood flow to lung inflation and
maintain an appropriate diffusion gradient of oxygen in the lungs
What other ideas could you test with regard to the relationship between breathing and heart rate?
- answer✔✔VO2 max test, what impact does exercise have on heart rate during deep and light
breathing
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