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Terms in this set (32)
Air moves into the lungs because
the gas pressure in the lungs in less than the atmospheric pressure.
The last division of the conducting zone is/are the
During quiet restful breathing,
inspiration requires muscle contraction and expiration is passive
By convention the local atmospheric pressure is considered zero. During normal restful breathing, at end expiration alveolar pressure is
zero, intrapleural pressure is negative, alveolar volume is at minimum.
Contraction of the abdominal muscles is important in
forced (maximum) expiration.
Which of the following has an alveolar ventilation greater than 3500 mL/min?
A, B, and C
When HCO3- diffuses out of the red blood cells into the plasma in systemic capillaries, _______ diffuses into the RBCs to replace it.
chloride ion (Cl-)
The contraction of the internal intercostal muscles will
decrease the volume of the thorax.
At an altitude of 8,000 feel, the average atmospheric pressure is about 564 mmHg and oxygen is 118 mmHg. The partial pressure of oxygen, or the PO2, is therefore equal to which of the following?
The ability of the lungs to stretch is called their _________.
The product of Pressure time Volume (P*V) in a closed container increases as the number of included gas molecules increases is best described by which of the following gas laws?
Ideal Gas Law
The increased pulmonary ventilation that occurs during exercise, is called
At a PCO2 = 40 mmHg, what is the % O2 saturation of the hemoglobin in the venous blood (PvO2 = 40mmHg)?
Which of the following are typical partial pressure for systemic carbon-dioxide in venous and arterial blood?
46 mmHg, 40 mmHg
The functional reserve capacity can be computed by
Air moves out of the lungs during expiration because
the pleural pressure becomes more positive.
An increase in alveolar PCO2 will cause the bronchioles to
dilate and systemic arterioles to dilate.
Inspiration driven by contraction of the diaphragm are due to signals formed in the medulla oblongata in which of the following locations?
Dorsal respiratory group
Which of the following will cause a shift of curve to the right?
The majority of carbon dioxide carried by the blood is found as
While sitting at rest, a person begins to voluntarily hypo-ventilate; what occurs?
Alveolar PO2 decreases, alveolar PCO2 increases
The oxygen-hemoglobin saturation curve shifts to the right when there is _______ inside the erythrocyte (RBC).
an increase in the H+ concentration
In the region of the airway, between the conductive zone and the respiratory zone, large particulate matter (i.e., coal dust) stops moving further into the airways because of the __________ in the cross-sectional surface area and the ________ in bulk flow of air in this region.
Which of the following is the most useful product of cellular respiration?
Place the following structures of the respiratory tree in the order in which an oxygen molecule will travel during a normal inspiration.
1. secondary bronchi
2. respiratory bronchioles
3. primary bronchi
5. terminal brochioles
answer: 3, 1, 5, 2, 4
The rate of blood flow in pulmonary circulation, ________________________ in systemic circulation.
is higher and the blood pressure is lower than
is the same as
What is the P50 of the left shifted curve?
Central chemoreceptors found in the medulla increases ventilation are DIRECTLY activated by
an increase in cerebral spinal fluid H+
Which of the following features of alveoli is most responsible for the rapid diffusion of gas between air and blood
At which of the following times in the respiratory cycle is the intrapleural pressure most negative?
Just before the end of inhalation
Which of the following is NOT TRUE regarding fetal hemoglobin?
At birth fetal hemoglobin is replaced by maternal hemoglobin
Which of the following are NOT involved in mucocillary clearance of the airway?
Type II alveolar cells
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