Respiratory Sys Objectives

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48 Terms

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What is the function of the respiratory system
To deliver O2 to the blood and take CO2 away from the blood
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Describe and identify two levels of gas exchange
Internal respiration (cellular respiration) and external respiration (exchange of O2/CO2 between body and atmosphere)
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4 Processes involved in external respiration

1. Pulmonary Ventilation (movement of air in and out of lungs)
2. Exchange of O2/CO2 between blood and lungs
3. Transportation of O2/CO2 between lungs and tissues by blood
4. Exchange of O2/CO2 between blood and tissues by diffusion
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6 Other functions of the respiratory system

1. Balance PH of blood (CO2 in carbonic acid)
2. Vocalization
3. Defense against pathogens (mucosal elevator)
4. Respiratory pump (venous return of blood to heart)
5. Activate plasma proteins
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How many lobes make up each lung
Left lung has two lobes and the right lung has three lobes
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Structures and functions of the upper airway
Air passages in head and neck that create path for airflow.


1. O2 enters nasal/oral cavity
2. O2 travels to pharynx
3. diverges with food
4. O2 enters larynx
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Two zones of the respiratory tract

1. Conduction zone creates path for airflow into respritory zone
2. Respiratory zone is where O2/CO2 move in and out of blood
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What is the importance of goblet and ciliated cells
Goblet cells secrete mucus to trap pathogens

Ciliated cells move in whiplike fashion to push mucus up and out of lungs
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Smoking’s effect on ciliated cells and mucosal elevator
Smoking paralyzes ciliated cells so the mucosal elevator cant function
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Structures of the respiratory zone
Respiratory Bronchioles and Alveoli
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Function of respiratory bronchioles
lead to alveoli
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How do gas molecules pass into blood
O2 diffuses from high to low concentration across one layer of type 1 cells, through respiratory membrane, into capillary
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6 components of the chest wall

1. 12 pairs of ribs
2. sternum (breast Bone)
3. thoracic vertebrae
4. Intercostal muscles (external and internal)
5. Diaphragm
6. Pleura - layer of epithelial cells that surround the lungs
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What is pneumothorax and its cause
Presence of air/gas in pleural space (between lungs and pleura) caused by air leaking from lungs, caused by traumatic injury
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Pressure gradient during inspiration
Palv < Patm
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Pressure gradient during expiration
Palv > Patm
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Alveolar Pressure
Palv (pressure of air inside alveoli)
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Atmospheric Pressure
Patm (pressure of the air outside the body)
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Intrapleural pressure
Pip (Pressure between lungs and pleura)
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Transpulmonary pressure
difference between Pip and Palv
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Muscles involved inspiration (inhalation)

1. external intercostals
2. diaphragm
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Muscles involved in expiration (exhale)

1. During quiet expiration the muscles relax
2. during active breathing, contract abdominal and internal intercostal muscles
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two factors that affect pulmonary ventilation

1. Lung compliance
2. airway resistance
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Define low lung compliance
how easy the lungs expand, tuberculosis creates scar tissue that affects compliance
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Asthma
Spastic contraction of smooth muscle in bronchiole walls
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Allergies
Histamine causes bronchi to contract and produce more mucus
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Diffusion across alveoli and blood
down the concentration gradient (high to low concentration)
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3 factors that rate of diffusion depends on

1. rate of diffusion increases as concentration increases
2. rate of diffusion increases as surface area increases
3. rate of diffusion increases as permeability of the membrane increases
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Partial Pressure
determined by fractional concentration on gas and total atmospheric pressure
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Concentration of O2 in air
21%
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Concentration of N2 in air
79%
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Patm
760mm/hg
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2 factors that determine solubility of gas in liquid

1. solubility of the gas (co2 is more soluble than o2)
2. increase in partial pressure = increase in solubility of gas
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What are the bends
when a SCUBA diver surfaces too quickly and the nitrogen bubbles form because of the rapid decrease in pressure
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Pulmonary edema
Accumulation of excess fluid in the alveoli, between type I cells
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Why is alveolar press’ different than atmospheric press’

1. o2 immediately diffuses from alveoli into bloodstream
2. Atmospheric air mixes with remaining co2 in lungs
3. Inspired air mixes with water vapor in lungs
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Why does partial pressure vary depending on the location on respiring tissue
it depends on how much the tissue is working
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3 factors that determine alveolar Po2 and Co2

1. Po2 and Pco2 of atmosphere
2. volume of air reaching alveoli /minute
3. rate of metabolism of respiring tissue
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hyperpnea
rate of alveolar ventilation increase as needs for o2 increase
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Hypoventilation
if Po2 fails to increase with need
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Hyperventilation
happens if Pco2 gets to low
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Inspiratory Reserve volume
Max volume of air inspired after quiet inspiration (3000ml)
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Expiratory Reserve Volume
max volume of air expired after quiet expiration (1000ml)
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Tidal Volume
Volume of air inspired/expired in quiet breath (500ml)
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Residual Volume
Volume of air in lungs after max expiration (1200ml)
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Inspiratory capacity
max volume of air that can be inspired after quiet expiration

Vt + IRV
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Vital Capacity
Max volume of air that can be expired after max inspiration

Vt + IRV + ERV
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Total Lung Capacity
max volume of air lungs can hold

Vt + IRV + ERV + RV