NUR 168 Exam 3 Questions with Verified
Correct Answers
For the body to get oxygen, 3 major things have to work:
AIRWAY → LUNGS → CIRCULATION
WHY Airway must be open
air gets to/from lungs.
WHY THE Alveoli must work
O₂ enters blood and CO₂ leaves.
WHY THE Cardiovascular system must work
blood carries O₂ to tissues
Blocked airway THINK:
Ventilation problem
Fluid-filled/damaged alveoli THINK:
Gas exchange problem
Poor blood flow THINK:
Perfusion problem
Alveoli THINK:
Gas exchange
Hemoglobin/RBCs
Transport O₂
,Surfactant
Prevents alveolar collapse
Perfusion
Blood reaching tissues
What does the upper airway consists of
Nose → pharynx → larynx → epiglottis
What is the main job of the upper airway
Warm + filter + humidify air
What does the lower airway consist of
Trachea → mainstem bronchi → segmental bronchi → terminal bronchioles → alveoli
lobes in right lung
3 lobes
lobes in left lung
2 lobes
what does the visceral pleura cover
lungs
What does the parietal pleura line?
thoracic cavity
what does ventilation do
moves air into and out of lungs
, what is perfusion
when oxygenated blood travels through tissues
What is respiration
O2 and CO2 exchanged between alveoli and blood
What is perfucion
oxygenated blood travels through tissues
what happens during inspiration (10)
diaphragm contracts -> moves downward -> external intercostals contract -> ribs move
upward/outward -> thoracic cavity gets bigger -> lung volume -> pressure inside lungs -> air
flows IN -> air flows IN
Order in which air moves
HIGH pressure -> LOW pressure
How does gas exchange occur
by diffusion. (o2 and co2 move between: alveoli and blood)
Things that affect diffusion: (4)
- Available surface area
- Thickness of alveolar-capillary membrane
- Partial pressure
- Solubility/molecular weight of gas
what happens If the alveolar membrane becomes thicker
gas has a harder time crossing it.
Correct Answers
For the body to get oxygen, 3 major things have to work:
AIRWAY → LUNGS → CIRCULATION
WHY Airway must be open
air gets to/from lungs.
WHY THE Alveoli must work
O₂ enters blood and CO₂ leaves.
WHY THE Cardiovascular system must work
blood carries O₂ to tissues
Blocked airway THINK:
Ventilation problem
Fluid-filled/damaged alveoli THINK:
Gas exchange problem
Poor blood flow THINK:
Perfusion problem
Alveoli THINK:
Gas exchange
Hemoglobin/RBCs
Transport O₂
,Surfactant
Prevents alveolar collapse
Perfusion
Blood reaching tissues
What does the upper airway consists of
Nose → pharynx → larynx → epiglottis
What is the main job of the upper airway
Warm + filter + humidify air
What does the lower airway consist of
Trachea → mainstem bronchi → segmental bronchi → terminal bronchioles → alveoli
lobes in right lung
3 lobes
lobes in left lung
2 lobes
what does the visceral pleura cover
lungs
What does the parietal pleura line?
thoracic cavity
what does ventilation do
moves air into and out of lungs
, what is perfusion
when oxygenated blood travels through tissues
What is respiration
O2 and CO2 exchanged between alveoli and blood
What is perfucion
oxygenated blood travels through tissues
what happens during inspiration (10)
diaphragm contracts -> moves downward -> external intercostals contract -> ribs move
upward/outward -> thoracic cavity gets bigger -> lung volume -> pressure inside lungs -> air
flows IN -> air flows IN
Order in which air moves
HIGH pressure -> LOW pressure
How does gas exchange occur
by diffusion. (o2 and co2 move between: alveoli and blood)
Things that affect diffusion: (4)
- Available surface area
- Thickness of alveolar-capillary membrane
- Partial pressure
- Solubility/molecular weight of gas
what happens If the alveolar membrane becomes thicker
gas has a harder time crossing it.
