Download Respiratory System Notes

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Document related concepts

Bag valve mask wikipedia, lookup

Transcript
The Respiratory System
9 Biology
Importance of Respiratory System
• Sustains cellular respiration by supplying
oxygen and removing carbon dioxide.
• Two Components:
– 1. Breathing- mechanical movement of air into
and out of the lungs
– 2. Gas exchange
• External: exchange of gases between atmosphere and
blood
• Internal: exchange of gases between blood and body
cells
Anatomy of Respiratory System
Structures:
• Nose pharynx larynx trachea
• Bronchus bronchioles alveoli
– Capillary beds in alveoli are where gases are
exchanged.
Alveoli
• Thin walled cells
surrounded by thin
capillaries
– O2 diffuses in, CO2
diffuses out
– CO2in blood exists as
carbonic acid dissolved
in plasma, bound to
hemoglobin
Mechanics of Breathing:
• Inhalation- diaphragm goes down to allow
filling of lungs
• Exhalation- diaphragm goes up to push air out
of lungs
• Intercostal muscles (between ribs) assist with
process
Respiratory Disorders
• Asthma- airways swell, restricting air flow
• Bronchitis- airways become infected
• Emphysema- alveoli break down, reducing surface area
for gas exchange
• Pneumonia-infection of lungs that causes mucous to
collect in alveoli
• Pulmonary tuberculosis- bacterial infection that
reduces capillary absorption
• Lung cancer- uncontrolled cell growth in lungs that
causes coughing, shortness of breath, pneumonia,
infection and death.
Respiratory Disorders