BIOL 253L Final Exam Questions With Verified Answers
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Course
Bio 253
Institution
Bio 253
BIOL 253L Final Exam Questions With
Verified Answers
Lab 11 learning objectives - answer- Describe the basic structures of lung anatomy and their
functional divisions.
- Compare and contrast the respiratory zone with the conduction zone.
- Describe the basic structures and processes involved i...
BIOL 253L Final Exam Questions With
Verified Answers
Lab 11 learning objectives - answer✔✔- Describe the basic structures of lung anatomy and their
functional divisions.
- Compare and contrast the respiratory zone with the conduction zone.
- Describe the basic structures and processes involved in lung gas exchange.
- Discuss why airflow profiles vary greatly between different lung zones.
Respiratory can be divided anatomically and functionally: - answer✔✔Upper respiratory tract &
lower respiratory tract
Nasal cavity - answer✔✔- During inhalation, atmospheric air enters the nasal cavity where it is
moistened and warmed.
- Fine hairs and mucus trap any dust particles, or other potentially harmful substances (such as
bacteria or viruses) that may be present, preventing them from entering the lungs.
- The mucocillary elevator covers most of the bronchioles, bronchi and nose.
Mucocillary elevator - answer✔✔covers most of the bronchioles, bronchi and nose
Why is the trachea lines with mucus? - answer✔✔The mucus helps trap foreign particles before
they can enter the lungs
The smaller airways there is: - answer✔✔Less cartilage and more smooth muscle
Pressure (P) results when - answer✔✔a force is exerted on a surface. Pressure and volume are
related by an inverse relationship. It is the amount of force (F) per unit area (A): P = F/A
Volume (V) refers to - answer✔✔the total space occupied by a substance. Volume is an
extensive variable. If we double the size of the system, we double its volume.
Kinetic theory of gases - answer✔✔if the volume of a gas is halved, the number of collisions
with the walls doubles. Thus, the pressure in the container is twice that of the original container.
P ∝ 1 / V (where ∝ = proportional to) or - answer✔✔P x V = a constant
Charles' law: - answer✔✔when pressure is held constant V ∝ T
Ideal gas law: - answer✔✔PV ∝ T or PV / T = k (a constant)
T or F: If the volume of a container is halved without removing any of the gas, the gas pressure
doubles - answer✔✔T
T or F: In a closed container, pressure increases when the temperature inside the container
increases - answer✔✔T
T or F: Pressure is Force (F) per unit Area (A) - answer✔✔T
T or F: When measured in a closed container, pressure has the same value everywhere -
answer✔✔T
T or F: Heating a gas at a constant pressure will increase the volume that it occupies -
answer✔✔T
Which law states that the volume of a gas is directly proportional to temperature, if the pressure
is held constant? - answer✔✔Charles' law
BTPS- Body Temperature, atmospheric Pressure and fully Saturated - answer✔✔In the lungs,
the inspired air has become fully saturated with water vapour at body temperature. At 37°C. this
contributes 47 mmHg to the total atmospheric pressure, which, at sea level approximates 760
mmHg. So the air is at Body Temperature, atmospheric Pressure and fully Saturated - BTPS.
ATPS- Ambient Temperature, atmospheric Pressure and fully Saturated - answer✔✔When the
expired air is collected for analysis, it is at the Ambient Temperature, atmospheric Pressure and
fully Saturated - ATPS.
Re-write ideal gas laws; - answer✔✔(P1 x V1)/T1 = (P2 x V2)/T2
STPD- Standard Temperature, standard Pressure and completely Dry - answer✔✔We need to
have some standard conditions to compare O2 consumption and CO2 production under different
conditions. For this, we use Standard Temperature (273K), standard Pressure (760 mmHg) and
completely Dry air - STPD.
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