Anatomy & Physiology II
LAB - Respiratory System ANSWERS
There are 5 stations to complete. Use this worksheet to record and, if necessary (!), correct answers. Work
together! You will have approximately 15 minutes per station.
Station 1: Anatomy
Using the diagrams in text and Wiley Plus, trace the airflow through the respiratory system starting with the
external nares. Number the structures in order from 1 through 15.
__13_ alveolar duct
__5__ oropharynx
__12_ bronchiole
__10_ secondary bronchus
__7__ larynx
__4__ nasopharynx
__15_ alveolus
__1__ external nares
__3__ internal nares
__11_ tertiary bronchus
__14_ alveolar sac
__9__ primary bronchus
__2__ nasal cavity
__8__ trachea
__6__ laryngopharynx
Station 2: Structure & Function
Using the cards located at your station, match the structure with the correct function and then complete the
following:
_respiratory bronchiole
tubular airways that begin the respiratory zone
__larynx___
connects the laryngopharynx with the trachea
__trachea___________
tube-like structure that conducts air from the larynx to the bronchi
___epiglottis_________
closes over the glottis during swallowing
____cartiledge_______
keep the trachea from collapsing
____teritary bronchus_
division of the bronchi that enter bronchopulmonary segments
___terminal bronchiole
last division of the conducting zone
_____oropharynx_____
conducts air from the nasopharynx to the laryngopharynx
_____aveolus________
small round sacs where gas exchange occurs
_____terminal bronchiole small conduction airway that serves a lobule
Station 3: Function of Respiratory Muscles
1. Define quiet and forced inspiration and expiration.
Quiet respiration is with active inspiration, using the primary muscle the diaphragm, and the external
intercostals. Qiet normal expiration is passive and uses no muscle use. Forced inspiration is when yu use
accessory muscles like the scalenes or sternocleidomastoids and forced expiration using the abdominal
muscles and internal intercostals
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2. Using the cards located at your station and the attached diagram, match the respiratory muscles to their
function:
__pectoralis minor________
a) elevates 3rd, 4th & 5th ribs
__sternocleidomastoids____
b) elevates the sternum
__internal intercostals_____
c) depresses ribs
__abdominal muscles______
d) compress abdominal contents & increases abdominal pressure
__scalenes _______________
e) elevates 1st & 2nd ribs
__external intercostals_____
f) elevates ribs
__diaphragm_____________
g) main inspiratory muscle
__abdominal muscles______
h) 2 muscles used in forced expiration
__internal intercostals _____
Station 4: Lung volumes & Capacities
1. Indicate whether the volume or pressure increases or decreases during inspiration & expiration:
Volume or Pressure
Thoracic volume
Intrapleural pressure
Lung volume
Alveolar (intrapulmonary) pressure
Inspiration




Expiration




Station 5: CD ROM Interaction
Using your Wiley plus , complete the following 3 exercises:
 1. Build an airway
 2. Paint the lung
 3. The airway
You may use the computers in lab or in Computer Commons.
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