Charles Barnes Real estate () exam prep with correct verified and Well Analyzed Answers Graded A+

Bio 235 Final (2025-2026) Exam with
Correct Verified and Well Analyzed
Answers Graded 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
veins.
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
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
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
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
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
a) P alveolus = P atmosphere
What keeps the lungs from collapsing

Check the
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
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
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
d) none of the above
trained athletes tend to have
a) increased lung compliance
b) normal lung compliance
c) decreased lung compliance
d) asthma
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
d) it is a closed, air-filled space surrounding both lungs that has a
negative pressure compared to atmospheric pressure
b) it is a closed sac surrounding each lung and contains only a tiny
volume of lubricating fluid
which structure is NOT part of the "anatomical dead space?"
a) bronchiole
b) trachea
c) bronchus
d) respiratory bronchiole
d)respiratory bronchiole
the volume of air flowing into the alveoli during inhalation/inspiration
is increased when there is an increase in which of these?
a) air resistance

, b) the pressure gradiant from the atmosphere to the alveoli
c) the pressure in the intrapleural space
d) the curvature of the diaphragm
b) the pressure gradiant from the atmosphere to the alveoli
under normal circumstances, which of the following would result from
an increase in transpulmonary pressure?
a) inhalation/inspiration
b) exhalation/expiration
c) a collapsed lung
d) emphysema
a) inhalation/inspiration
which of the following statements about the response of arteriole
smooth muscle to changing ocygen partial pressure is true?
a) both systemic and pulmonary arterioles respond to a decrease in
PO2 by constricting
b) both systemic and pulmonary arterioles respond to a decrease in
PO2 by dilating
c) systemic arterioles respond to a decrease in PO2 by dilating but
pulmonary arterioles constrict in response to decreased PO
d) systemic arterioles respond to a decrease in PO2 by constricting
but pulmonary arterioles dilate in response to decreased PO2
c) systemic arterioles respond to a decrease in PO2 by dilating but
pulmonary arterioles constrict in response to decreased PO
during an unforced exhalation/expiration, which would NOT be true?
a) alveolar pressure is greater than atmospheric pressure
b) intrapleural pressure is greater than alveolar pressure
c) intrapleural pressure becomes less negative
d) the diaphragm relaxes
b) intrapleural pressure is greater than alveolar pressure
which true regarding how gases dissolve in liquids?
a0 the concentration of a gas in a liquid equilibrates to match the
concentration of that gas in the air to which of the liquid is exposed
b) different gasses have the same solubility in liquids
c) the partial pressure of a gas in a liquid is equal to the amount
greatly diffusing in the liquid plus the amount bound to large
molecules within the liquid
d) the partial pressure of a particular gas in a liquid equilibrates to