Quiz 3 2024 Flashcards
As alveolar ventilation increases, more CO2 is pulled out of the blood. What happens to PaCO2 and PACO2 values?
they both decrease
Alveoli do not contain cilia to help remove dust and debris that reaches the lower airways, so how do they remove the irritants?
alveolar macrophages
A 6 kg cat has a tidal volume of 8 mL/kg and a minute volume of 1200 mL. What is the respiratory rate for this cat? Choose the correct numerical value and the correct units.
25 breaths per minute
What is the approximate partial pressure of oxygen if the barometric pressure is 600 mm Hg and the FIO2 is 40%? Choose the correct numerical answer and correct units.
240 mm Hg
When the lungs inflate, how does intrapleural pressure change?
becomes negative
If the total amount of gas transported across the alveolar/capillary barrier is limited by blood flow through the pulmonary capillaries, this is called diffusion-limited gas exchange. true or false
false
What is the partial pressure of oxygen in a gas containing 35% oxygen at sea level (atmospheric pressure)? Choose the correct numerical value and correct units.
266 mmHg
In tissues, the partial pressure of oxygen in blood has fallen to 40 mm Hg. What is a reason oxygen continues to dissociate from hemoglobin and enter the tissues?
PO2 in tissues is low relative to blood
A 440 kg horse has a respiratory rate of 12 breaths/minute. What is this horse’s minute volume? Choose the correct numerical value and correct units.
52.8 liters
How would ventilation be described in a V/Q mismatch where the ratio is low?
low ventilation
Which situation can cause hypoxia?
decreased cardiac output
To calculate alveolar ventilation, what must be measured?
physiological dead space
A 60 kg dog has a PaCO2 of 40 mmHg, a PECO2 of 35 mmHg, and tidal volume of 10 mL/kg. What is the physiologic dead space? Choose the correct numerical value and correct units.
75 mL
What is the alveolar ventilation (VA) in a 400 kg horse with a respiratory rate (RR) of 12 breaths per minute, a PaCO2 of 50 mm Hg, and an ETCO2 of 25 mm Hg? Choose the correct numerical value and correct units.
24 L/min
What happens to the oxy-hemoglobin dissociation curve during exercise?
shifts to the right
Which species is an obligate nose-breather?
humans
cow
dog
cat
cow
What is the volume of gas remaining in the lungs after a maximal forced expiration?
residual volume
You have the following information: PaO2 = 45 mm Hg, oxygen saturation = 75%, and Hb concentration = 20 g/100 mL. How much oxygen is carried by the blood? Choose the correct numerical value and correct units.
20.24 mL/100 mL
If P50 increases, what has happened to the affinity of hemoglobin for oxygen?
it has decreased
Which area of the brain will limit the size of the tidal volume when it is stimulated?
Pneumotaxic center
Why is perfusion reduced in Zone 1 of the lungs?
- Pa is lower than PA
- PA is lower than Pa
- Pa is equal to PA
Pa is lower than PA
Which characteristics describe wheezing?
abnormal and continuous
high pitched
musical quality
What is tidal volume if minute volume is 2400 mL and respiratory rate is 16 breaths/min? Choose the correct numerical value and correct units.
150 mL
Which respiration pattern is fast and deep, and can be associated with anxiety?
Kussmaul’s
Which substance can be almost completely removed and inactivated by the lungs?
serotonin
