QUESTION 1 The ciliated cells of the conducting zone structures function to ____
ID: 3481028 • Letter: Q
Question
QUESTION 1
The ciliated cells of the conducting zone structures function to __________.
propel mucus-containing trapped particles away from the lungs.
produce a viscous solution called mucus.
provide the rigid support that maintains its open state.
allow the accumulation of mucus within the conducting zone.
engulf foreign material that has been trapped within the mucus.
1 points
QUESTION 2
The partial pressure of carbon dioxide in arterial blood is approximately
100 mm.
40 mm.
70 mm.
45 mm.
50 mm.
1 points
QUESTION 3
Which of the following will cause a shift in the hemoglobin-oxygen dissociation curve to the right (increase oxygen unloading)?
increase in 2,3-bisphosphoglycerate (BPG) only
an increase in temperature or an increase in plasma pH
increase in plasma pH only
increase in temperature only
an increase in temperature or an increase in BPG
1 points
QUESTION 4
In order to transport bicarbonate out of the erythrocyte while maintaining electroneutrality, a ___________ ion is transported into the erythrocyte at the same time bicarbonate moves out.
hydrogen
sulfate
sodium
chloride
phosphate
1 points
QUESTION 5
One benefit from air passing by the nasal conchae is
they separate airflow from food and drink.
the air is warmed & humidified before entering the lower respiratory tract.
they filter CO2 from the air.
they increase its oxygen concentration.
this is where odors are detected.
1 points
QUESTION 6
____ states that the total pressure of a gas mixture is equal to the sum of the partial pressures of its individual gases.
Boyle's law
Valsalva's law
Dalton's law
Charles's law
Henry's law
1 points
QUESTION 7
With the Bohr effect, more oxygen is released at systemic tissues because:
a decrease in pH strengthens the hemoglobin-oxygen bond.
a decrease in pH weakens the hemoglobin-carbon dioxide bond.
an increase in pH strengthens the hemoglobin-oxygen bond.
a decrease in pH weakens the hemoglobin-oxygen bond.
an increase in pH weakens the hemoglobin-oxygen bond.
1 points
QUESTION 8
Each of the following occurs in association with systemic gas exchange except
oxygen diffuses from the blood to the interstitial spaces.
carbon dioxide diffuses from the interstitial spaces to the blood.
hemoglobin becomes more saturated with oxygen.
chloride ions are transported into red blood cells as bicarbonate ions are transported out.
bicarbonate ions are formed in the red blood cells.
1 points
QUESTION 9
Which of the following best represents the saturation of hemoglobin after a RBC passes through systemic tissues at rest?
50%
75%
25%
100%
1 points
QUESTION 10
When air is no longer moving through the respiratory tract and the airway is open to the external environment, the pressure within the lung is equal to ________.
intrapleural pressure
systolic blood pressure
transpulmonary pressure
atmospheric pressure
end-diastolic pressure
1 points
QUESTION 11
The major factor(s) responsible for holding the lungs to the thorax wall is/are
the visceral pleurae and the changing volume of the lungs.
the diaphragm and the intercostal muscles.
cohesion between water molecules in pleural fluid that enables the visceral and parietal pleurae to cling together.
connective tissue fibers that attach to the thoracic wall and the surface of the lungs.
the smooth muscles of the lung.
1 points
QUESTION 12
Which of the following regions of the respiratory tract is lined with stratified squamous epithelium?
pharynx
olfactory epithelium
trachea
alveoli of the lungs
nasopharynx
1 points
QUESTION 13
In quiet (tidal) breathing
inspiration and expiration involve muscular contractions.
inspiration is passive and expiration involves muscular contractions.
inspiration involves muscular contractions and expiration is passive.
inspiration and expiration are both passive processes.
none of the above.
1 points
QUESTION 14
Which of the following best describes the change in partial pressure of oxygen of blood as it moves through the pulmonary circuit and then the systemic circuit?
falls then rises
remains unchanged
rises, then falls
1 points
QUESTION 15
The walls of the alveoli are composed of two types of pneumocytes, type I (squamous) and type II (great alveolar). The function of type II is:
to trap dust and other debris.
to transport oxygen and carbon dioxide across the respiratory membrane.
to secrete mucus into the alveoli.
to protect the lungs from bacterial invasion.
to secrete surfactant.
1 points
QUESTION 16
A molecule that blocks the activity of carbonic anhydrase would
interfere with oxygen binding to hemoglobin.
cause a decrease in the amount of bicarbonate formed in the red blood cells.
increase the amount of bicarbonate formed in the blood.
decrease the amount of carbon dioxide dissolved in the plasma.
have no effect on carbon dioxide transport.
1 points
QUESTION 17
The respiratory membrane is a combination of:
alveolar sacs and alveolar ducts.
respiratory bronchioles and alveolar ducts.
respiratory bronchioles and alveolar sacs.
atria and alveolar sacs.
alveolar and capillary walls and the basement membrane in-between them.
1 points
QUESTION 18
_____ cells become more abundant as you move deeper into the conducting zone (from bronchi to bronchioles).
Cartilaginous
Goblet
Type I alveolar
Ciliated
Smooth muscle
1 points
QUESTION 19
Within an erythrocyte, the conversion of CO2 to bicarbonate is prevented from reaching equilibrium by the _________.
presence of oxygen
removal of bicarbonate from the erythrocyte via the chloride shift
absence of a nucleus
presence of hydrogen ions
temperature of the body
1 points
QUESTION 20
While we can choose to hold our breath briefly, ____________will eventually force us to take a breath.
increasing oxygen levels.
decreasing carbon dioxide levels.
increasing blood pH.
increasing carbon dioxide levels.
1 points
QUESTION 21
Most of the oxygen transported by the blood is
bound to plasma proteins.
as carbamino compounds.
bound to hemoglobin.
dissolved in the cytosol of red blood cells.
dissolved in plasma.
1 points
QUESTION 22
As the lungs expand, intrapulmonary pressure ______ and air moves ______ the lungs.
increases; into
decreases; out of
decreases; into
does not change; neither into nor out of
increases; out of
1 points
QUESTION 23
Oxygen and carbon dioxide are exchanged in the lungs and through all cell membranes by:
diffusion.
active transport.
exocytosis.
filtration.
osmosis.
1 points
QUESTION 24
Which of the following describes the net direction of diffusion of gases at pulmonary capillaries?
oxygen into blood, carbon dioxide out of blood
oxygen out of blood, carbon dioxide out of blood
oxygen out of blood, carbon dioxide into blood
oxygen out of blood, no net movement of carbon dioxide
oxygen into blood, carbon dioxide into blood
a.propel mucus-containing trapped particles away from the lungs.
b.produce a viscous solution called mucus.
c.provide the rigid support that maintains its open state.
d.allow the accumulation of mucus within the conducting zone.
e.engulf foreign material that has been trapped within the mucus.
Explanation / Answer
Ciliated cell of conducting zone function to propel mucus conting trappe paryicle out of lungs.so ans.A
2.paco2 in arterial vlood is 40mmhg so.ans.B.
3.rught shift if curve by both ibxrease in temprature and 2,3 BPG si ans.E .
4.hco3 exchange with choride ion .that us chloreide shift.D
5.air passage through nasal conchna silo that it reamain warmed and humidufied befire entering lower respiratiry tract ans.B
6.by dalton's law total pressure equal to sum of partial pressure of gas.
7.bohr 's rffect -increase in ph weaken hemoglobin oxygen bond.
8..C hemoglobin becomes more saturated with oxygen that doesnot occur with gascexchabge.
9.75 %if hemoglobin get saturated.
10.A .it us intrapleural pressure
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