Quiz 3 2024

Question 1

As alveolar ventilation increases, more CO2 is pulled out of the blood. What happens to PaCO2 and PACO2 values?

Answer 1

they both decrease

Question 2

Alveoli do not contain cilia to help remove dust and debris that reaches the lower airways, so how do they remove the irritants?

Answer 2

alveolar macrophages

Question 3

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.

Answer 3

25 breaths per minute

Question 4

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.

Answer 4

240 mm Hg

Question 5

When the lungs inflate, how does intrapleural pressure change?

Answer 5

becomes negative

Question 6

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

Answer 6

false

Question 7

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.

Answer 7

266 mmHg

Question 8

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?

Answer 8

PO2 in tissues is low relative to blood

Question 9

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.

Answer 9

52.8 liters

Question 10

How would ventilation be described in a V/Q mismatch where the ratio is low?

Answer 10

low ventilation

Question 11

Which situation can cause hypoxia?

Answer 11

decreased cardiac output

Question 12

To calculate alveolar ventilation, what must be measured?

Answer 12

physiological dead space

Question 13

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.

Answer 13

75 mL

Question 14

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.

Answer 14

24 L/min

Question 15

What happens to the oxy-hemoglobin dissociation curve during exercise?

Answer 15

shifts to the right

Question 16

Which species is an obligate nose-breather?

humans
cow
dog
cat

Answer 16

cow

Question 17

What is the volume of gas remaining in the lungs after a maximal forced expiration?

Answer 17

residual volume

Question 18

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.

Answer 18

20.24 mL/100 mL

Question 19

If P50 increases, what has happened to the affinity of hemoglobin for oxygen?

Answer 19

it has decreased

Question 20

Which area of the brain will limit the size of the tidal volume when it is stimulated?

Answer 20

Pneumotaxic center

Question 21

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

Answer 21

Pa is lower than PA

Question 22

Which characteristics describe wheezing?

Answer 22

abnormal and continuous
high pitched
musical quality

Question 23

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.

Answer 23

150 mL

Question 24

Which respiration pattern is fast and deep, and can be associated with anxiety?

Answer 24

Kussmaul’s

Question 25

Which substance can be almost completely removed and inactivated by the lungs?

Answer 25

serotonin