BIOS 235 FINAL EXAM ATHABASCA UNIVERSITY COMPLETE STUDY GUIDE WITH HIGH-YIELD PRACTICE QUESTIONS, DETAILED ANSWER EXPLANATIONS AND RATIONALES, COMPREHENSIVE BIOLOGICAL CONCEPT REVIEW, APPLICATION-BASED EXERCISES, TEST-TAKING STRATEGIES, AND COMPLETE EXAM

BIOS 235 FINAL EXAM ATHABASCA UNIVERSITY
COMPLETE STUDY GUIDE WITH HIGH-YIELD
PRACTICE QUESTIONS, DETAILED ANSWER
EXPLANATIONS AND RATIONALES,
COMPREHENSIVE BIOLOGICAL CONCEPT REVIEW,
APPLICATION-BASED EXERCISES, TEST-TAKING
STRATEGIES, AND COMPLETE EXAM PREPARATION
TOOLS – 2026/2027 LATEST UPDATED EDITION

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 -
ANSWER-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 –
ANSWER-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 –
ANSWER-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 –
ANSWER-a) P alveolus = P atmosphere


What keeps the lungs from collapsing


Check the –

,ANSWER-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 –
ANSWER-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 –

, ANSWER-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 - ANSWER-d) none of the above


trained athletes tend to have
a) increased lung compliance
b) normal lung compliance
c) decreased lung compliance
d) asthma –
ANSWER-a) increased lung compliance


which is true abbout the pleural sac
a)it is continuous with the atmosphere and protects the lungs from
infections
b) it is a closed sac surrounding each lung and contains only a tiny
volume of lubricating fluid
c) it is a closed sac surrounding each lung and contain a large
volume of surfactact