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Bio 235 Final Exam – Athabasca
Questions with Complete Correct
Answers | Grade A+

Venous blood returning from systemic circulation first enters the ___, proceeds to the ____,

loses ___and gains ____ in the lungs, and then returns to the heart via the ____.




a) right atrium, right ventricle, pulmonary artery, CO2, O2, pulmonary vein s.

b) Left atrium, left ventricle, pulmonary artery, CO2, O2, aorta

c)Right atrium, right ventricle, pulmonary artery, O2, CO2, pulmonary veins

d) Left atrium, right ventricle, pulmonary veins, O2, CO2, aorta

Ans: A. Right atrium, right ventricle, pulmonary artery, CO2, O2, pulmonary veins




The upper respiratory tract differs from the lower respiratory tract in what way?

A) air is taken in through the lower respiratory tract, and CO2/O2 are exchanged in the upper

respiratory tract

b) air is taken in through the upper respiratory tract, and CO2/O2 are exchanged in the lower

respiratory tract

c) CO2 is removed from circulation in the upper respiratory tract

d) O2 is removed from circulation in the lower respiratory tract

,Ans: B. Air is taken in through the upper respiratory tract, and CO2/O2 are exchanged in the

lower respiratory tract




Smooth muscle surrounds which structure of the lower respiratory tract? a)

Alveoli

b) Alveolar capillaries

c) Terminal bronchioles

d) Trachea

Ans: C. terminal bronchioles




In the alveolus, ____squamous epithelial cells are responsible for ___, while ___cells are

responsible for ____.

a) Type 1; surfactant secretion; Type 2, gas exchange

b) type 1; debris removal; type 2; surfactant secretion

c) type 3; debris removal; type 1; gas exchange

d) type 1; gas exchange; type 2: surfactant secretion

Ans: d) type 1; gas exchange; type 2: surfactant secretion




There is no net air flow into or out of the lungs when

a) P alveolus = P atmostpher

,b) P alveolus< P atmostphere

c) P pleural wall > P atmostphere

d) P atmosphere< P pleural wall

Ans: a) P alveolus = P atmosphere




What keeps the lungs from collapsing




Check the

Ans: b) trans pulmonary negative pressure caused by negative pressure from pleural cavity




Identify the correct sequence of events for inspiration

a) diaphragm & inspiratory intercostals relax, lungs expand, air flows into alveoli

b) diaphragm & inspiratory intercostals contract; lungs expand, air flows out of the alveoli

c) diaphragm & inspiratory intercostals contract, lungs expand, air flows into alveoli

d)diaphragm & expiratory intercostals relax, lungs contract, air flows out of alveoli

Ans: c) diaphragm & inspiratory intercostals contract, lungs expand, air flows into alveoli




the main determiners of lung compliance are

a) lung tissue thickness, surface tension of fluid on the inner lung surface

b) lung tissue perforations, surface tension of fluid on the inner lung surface

, c) lung tissue surface area, surface tension of fluid on the inner lung surface

d) lung tissue thickness, surface tension of fluid on the outer lung surface

Ans: a) lung tissue thickness, surface tension of fluid on the inner lung surface




lung compliance is defined as

a) lung volume/ transpulmonary pressure

b) transpulmonary pressure/ lung volume

c) transthoracic pressure/ atmospheric pressure

d) none of the above

Ans: d) none of the above




trained athletes tend to have

a) increased lung compliance

b) normal lung compliance

c) decreased lung compliance

d) asthma

Ans: a) increased lung compliance




which is true abbout the pleural sac

a)it is continuous with the atmosphere and protects the lungs from infections