PHGY 210 – MAMMALIAN PHYSIOLOGY II MIDTERM
Wednesday, February 18, 2004
MCGILL STUDENT NO.:
PROGRAM and YEAR:
1. The 9 digit McGill STUDENT NUMBER (ID) and CHECK BITS (the two first
letters of your last name as indicated on your ID) will be used for identification
purposes in this test. Please place your McGill ID number on this test paper and also
in the spaces marked "Student No." on your Answer Sheet.
IMPORTANT: Below the words "Student No." and "Check Bits", FILL IN
THE APPROPRIATE CIRCLES.
2. DO NOT FOLD or BEND the Answer Sheet.
3. Use a No. 2 or HB black pencil to fill in the appropriate circle on the IBM answer
sheet. ALL ERASURES MUST BE COMPLETE.
4. ANSWER ALL 35 QUESTIONS. Marks are not deducted for wrong answers.
5. The time allocated for the exam is 1 hour and 30 minutes. 6. LEAVE THE ANSWER SHEET AND THE ENTIRE EXAMINATION PAPER
as directed at the end of the exam. You may NOT take any part of the examination
paper with you.
7. CHALLENGES/EXPLANATIONS: If you think that a given question is unclear or
ambiguous, MARK THE NUMBER OF THE QUESTION AND THE ANSWER
YOU HAVE GIVEN AT THE TOP OF THIS PAGE. Use the back of this sheet
to very briefly explain the reasoning you have used to arrive at your answer. If your
reasoning is correct, it will be taken into account in the determination of your grade.
Challenges WILL NOT be considered after the examination has been written.
8. The results of this examination may be submitted to statistical testing designed to
UNCOVER POSSIBLE CHEATING.
9. Scientific calculators are permitted (NO WORD MEMORY).
NOTE: The Department of Physiology will not tolerate any academic offenses with
regard to cheating. Students are FORBIDDEN to converse with any person, other than
an INVIGILATOR,during the course of the exam. If you are seen speaking with another
student, your examination and answer sheet WILL BE IMMEDIATELY COLLECTED
BY THE INVIGILATOR.
Type A Questions (One correct response only):
1. At the end of a quiet expiration,
a) the abdominal muscles contract.
b) the respiratory system is at its resting position. c) the recoil pressure of the chest wall is equal to atmospheric pressure.
d) the recoil pressure of the lungs is equal to atmospheric pressure.
e) the activity of vagal pulmonary slowly adapting stretch receptors is
2. Alveolar ventilation will increase when
a) the PO in2the arterial blood is above 70 mmHg.
b) the body metabolism increases.
c) some noxious gases are present in the inspired air.
d) CO is present in the inspired air.
e) C-fibers are stimulated.
3. An individual decreased voluntarily his tidal volume by 50% and doubled
frequency of his respiration. These changes in his breathing pattern, if
kept for 1
minute, will result in an increase in
a) minute ventilation.
b) alveolar ventilation.
c) the rate of gas diffusion in the alveoli.
d) PCO in2the arterial blood. e) PO i2 the arterial blood.
4. Voluntary hyperventilation will increase
a) the CO co2tent in the arterial blood.
b) the alveolar ventilation-perfusion ratio.
c) the body metabolic rate.
d) the PCO in2the arterial blood.
e) the difference between the O conte2t in the arterial and mixed venous
blood. 5. During static conditions, when all respiratory muscles are relaxed and the
volume is equal to about 75% of the total lung capacity,
a) the total respiratory system is at its resting position.
b) the intrapleural pressure reflects the elastic recoil pressure of the chest
c) the transpulmonary pressure is less than the atmospheric pressure.
d) the elastic recoil pressure of the total respiratory system is less than
the atmospheric pressure.
e) the compliance of the total respiratory system is similar to that
measured at the lung volumes close to the FRC.
6. In a given individual, the PO2in the alveolar gas is equal to 90 mmHg.
This value of
the PAO 2
a) suggests an alveolar ventilation-perfusion ratio lower than 0.8.
b) suggests hyperventilation.
c) is normal in healthy individuals.
d) indicates an increase in the body metabolism.
e) is related to the Bohr effect. 7. Rapidly adapting pulmonary vagal receptors
a) are innervated by non-myelinated fibers.
b) are located within the alveolar-capillary membrane.
c) when stimulated, provoke prolongation of expiration.
d) exhibit a regular firing frequency throughout the respiratory cycle.
e) are stimulated by noxious gases present in the inspired air.
8. In a person with severe emphysema,
a) the lung volume at the FRC is lower than in a healthy individual.
b) the lung compliance is low.
c) the recoil pressure of the total respiratory system is decreased.
d) the distance for O d2f