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MEGAQUIZ (Quizzes 5 and 6)
Started: Mar 13 at 11:02pm
Quiz Instruc ons
Because this is your first assessment since Exam I, #MEGAQUIZ will cover all material discussed in lecture since Lecture 15 on Monday, February
20. This includes everything dating back to muscle fiber types and includes all of respiratory physiology and the first two lectures on cardiovascular
physiology. Additionally, this quiz will cover material to be discussed during Week 9.
This quiz must be completed by 9AM on Wednesday, March 22.
Question 1
2 pts
If a muscle biopsy were performed on an elite distance runner, it would likely exhibit relatively:
High capillary density
High fatigue resistance
High myoglobin content
High oxidative enzyme content
All of the above.
Question 2
2 pts
If a muscle biopsy were performed on an elite weightlifter, the muscle would likely exhibit relatively
Small diameter
High glycolytic enzyme content
Low SERCA pump activity
High mitochondrial density
All of the above.
Question 3
If a muscle biopsy were performed on an elite weightlifter, the muscle would likely exhibit relatively
2 pts
Question 4
2 pts
When a whole muscle enlarges, as a mechanism for creating more contractile proteins and more potential crossbridges,
it exhibits hyperplasia, or addition of new muscle fibers.
Question 5
2 pts
What is one function of the type II alveolar cells?
production of surfactant, so large alveoli do not collapse into small alveoli
production of surfactant, so small alveoli do not collapse into large alveoli
phagocytizing bacteria and other foreign particles
secretion of mucus
make up the majority of the epithelial wall of the alveoli
Question 6
2 pts
The wonderful city of Cusco, Peru, sits at an elevation of approximately 11,150 feet, and many visitors suffer symptoms of
altitude sickness due to low oxygen availability. This is because the percentage of atmospheric gas composed of oxygen is
much lower at the high elevation than at sea level.
Question 7
2 pts
An individual’s PAO2 is often lower than atmospheric PO2 because:
As a consequence of tidal breathing, the first ~150 mL of a breath is “stale” air entering the alveoli from the anatomic
dead space.
As air enters the lungs it is warmed and moistened, and the presence of water vapor results in a lower PAO2.
O2 is constantly diffusing from the alveoli into the lung, reducing its partial pressure.
CO2 is diffusing from venous blood into the alveoli, reducing PO2.
All of the above.
Question 8
2 pts
A subject’s respiratory rate is 12 breaths per minute, his anatomical dead space is 150 mL, and his minute ventilation is 7
L/min. Which of these is closest to his alveolar ventilation in liters per minute?
Question 9
2 pts
An individual visits a pulmonologist and has their lung volumes measured via spirometry. It is determined that they have a
vital capacity of 4,000 mL and an FEV1/FVC ratio of 0.60. This indicates:
Normal lung function
An obstructive pulmonary disease, such as pulmonary fibrosis
A restrictive pulmonary disease, such as asthma.
An obstructive pulmonary disease, such as asthma.
A restrictive pulmonary disease, such as asthma.
Question 10
2 pts
If a patient with asthma has a bronchiole twice as narrow as a healthy patient, they will experience twice as much
resistance to air flow as a healthy patient.
Question 11
2 pts
Which is true regarding how gasses dissolve in liquids?
The concentration of a particular gas in a liquid equilibrates to match the concentration of that gas in the air to which
the liquid is exposed.
Different gasses have the same solubility in liquids
The partial pressure of a gas in a liquid is equal to the amount freely diffusing in the liquid plus the amount bound to
large molecules within the liquid.
The partial pressure of a particular gas in a liquid equilibrates to match the partial pressure of that gas in the air to
which the liquid is exposed, and the concentration of gas dissolved in the liquid is proportional to its solubility.
As the partial pressure of a particular gas in an air sample increases, the concentration of that gas in a liquid
exposed to that air sample decreases.
Question 12
During intense exercise, the oxygen­hemoglobin binding affinity may __________ as indicated by a __________ P50.
Increase; increased
Increase; decreased
Decrease; increased
2 pts
Decrease; decreased
Decrease; increased or decreased
Question 13
2 pts
Regarding the partial pressures of O2 and CO2, which of the following statements is not true in a normal person at rest?
Atmospheric PO2 is greater than alveolar PO2.
The PCO2 in air is less than alveolar PCO2.
The PO2 in systemic arteries is typically greater than the alveolar PO2.
PCO2 in the systemic veins is greater than systemic arterial PCO2.
PCO2 in the pulmonary arteries is greater than pulmonary venous PCO2.
Question 14
2 pts
Which occurs as a result of hypoventilation?
The pH of the blood increases.
Levels of blood O2 increase.
Levels of blood H+ ions increase.
Alveolar CO2 decreases to near atmospheric levels.
Alveolar oxygen increases toward atmospheric levels.
Question 15
Which of these would tend to increase ventilation?
lower than normal arterial PCO2
higher than normal arterial pH
2 pts
breathing carbon monoxide
breathing air with increased PCO2
iron­deficiency anemia
Question 16
2 pts
During isovolumic contraction, despite ventricular contraction and increasing ventricular pressure, no blood is ejected from
the heart because:
The AV valves are closed
The semilunar valves are closed
Ventricular pressure is higher than atrial pressure
Pressure in the aorta is higher than ventricular pressure
All of the above.
Question 17
2 pts
Which of the following can result in increased cardiac output?
Increased end diastolic volume
Increased contractility
Healthy “physiologic” cardiac hypertrophy
Increased heart rate
All of the above.
Question 18
If you have your blood pressure measured as 120/80, what is your mean arterial pressure?
120 mmHg
2 pts
106 mmHg
100 mmHg
93 mmHg
80 mmHg
Question 19
2 pts
In which type of vessel is diameter, and therefore resistance to flow, most actively controlled?
Question 20
2 pts
In the feedback loop governing regulation of blood pressure, where are the “sensors” located?
SA Node
Large arteries (like the aorta and carotid)
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