Function

  • supplies oxygen to cells and removes carbon dioxide
  • defending the body against invasion of microorganisms
  • control the body’s blood pH

Components:

Ventilation (breathing) > inhalation and exhalation; take in oxygen and dispose of carbon dioxide

External Respiration > the exchange of gases between the alveoli and the blood

READ:
Castles: Purpose & Function

Internal Respiration > exchange of gases between the blood and tissue cells

OrganStructureFunction
Nasal cavity– lined with capillaries; warm air to 37°C- secrete mucus; moisten and filter air

 

– lined with cilia; filter out debris in the air

– warms, moistens and filters air entering the respiratory system
Pharynx – path that connects nasal cavity to the trachea
Epiglottis– a tiny flap of connective tissue– prevents food from entering the trachea during swallowing- prevents air from entering the stomach when breathing in
Larynx– made up of cartilage- contains the vocal cords; two highly elastic folds– to produce sound for communication
Trachea– a hollow tube surrounded by tough, flexible C-shaped cartilage rings- lined with cilia

 

– lined with mucus secreting cells

– allows air to pass from the pharynx into the lungs- cartilage rings prevent the trachea from collapsing and provide it with support
Lung– composed of the bronchi, bronchioles and alveoli– the main organs of the respiratory system
Bronchi– branch out of the trachea- hollow tubes surrounded by cartilage rings

 

– lined with cilia and mucus secreting cells

– to carry the air into the lungs
Bronchioles– branch out of the bronchi- large bronchioles secrete mucous and are lined with cilia– to decrease in size and carry air to the alveoli
Alveoli– clusters of tiny hollow air sacs; the ends of the smallest bronchioles- surrounded by an extensive network of capillaries

 

– very small structures with very high surface area

– are the sites of gas exchange

Respiratory Membrane

  • wall of alveoli and wall of capillaries come together for form a respiratory membrane
  • gas exchange occurs across the respiratory membrane
READ:
Sentence Components: Periodic & Cumulative Sentence, Absolute Phrase

Gas Exchange

  • exchange of gases (O2 & CO2) between the alveoli & the blood occurs by simple diffusion
  • diffusion requires a concentration gradient
  • the surface of the alveoli must be moist so that diffusion can occur
Subscribe
Notify of
guest

16 Comments
Most Voted
Newest Oldest
Inline Feedbacks
View all comments
Ganesh
Ganesh
3 years ago

I learned lots about the respiratory system

patrick gyan
patrick gyan
12 years ago

HELLO AND THANKYOU!

Riya
Riya
Reply to  patrick gyan
6 years ago

That is not proper grammar but thats fine.

Jack
Jack
Reply to  Riya
5 years ago

that’s *

Emily R.
Emily R.
6 months ago

thanks!

Jack E.
Jack E.
2 years ago

Top-notch work

Alfa G.
Alfa G.
6 years ago

thks! hope i get a good mark!

Niomi M.
Niomi M.
7 years ago

this is a nice and resourceful website

T. Johns
T. Johns
7 years ago

it helped me!

dan
dan
Reply to  T. Johns
4 years ago

your welcome

Christine M.
8 years ago

Thank you!

Joshua
Joshua
Reply to  Christine M.
5 years ago

no

Jack
Jack
8 years ago

Wow this is so good

mona
mona
8 years ago

Thank you.

emma
emma
9 years ago

Thanks this site gives me a lot of answers

lala
lala
10 years ago

THANKS!