Structures Of The Respiratory System (upper & lower)


  • Nose - Nasal Cavity- space behind the nose

Nasal Septum- divides nasal cavities into R and L sides

Turbinates- bones that protrude into nasal cavity, increase surface

Cilia- the hairs in your nose, trap larger dirt particles

  • Sinuses- cavities in the skull, ducts connect them to the nasal cavity, lined with mucous membrane to warm an moisten the air (frontal, maxillary, ethmoid, sphenoid)
  • Pharynx- throat, passageway for air an food
  • Epiglottis- flexible flap at the superior end in the larynx in the throat
  • Larynx- voice box, triangular chamber below pharynx
  • Trachea- windpipe ; 4 1/2 in. long


  • Lungs- cone shaped organs which fill the thoracic cavity
  • Pleura- thin, moist slippery membrane that covers lungs
  • Mediastinum- interpleural space, between the lungs

Importance of the Respiratory System (relates to immunity)

The immune system is within every organ of our body, including the lungs to defend it from foreign material, toxic inhalants, infections, bacteria and allergens.

The respiratory has parts of the immune system in it, balt- bronchial. There are cells in the lining of the lung that sample the air for viruses, these cells communicate with the immune system to make antibodies that can circulate to protect from infections.

Body's use of Nutrients to The Respiratory System

Respiratory system is to take in carbon dioxide and produce oxygen, which keeps us alive. The respiratory system plays a vital role in homeostasis.

  • Vitamin D- prevents respiratory diseases in newborns
  • Vitamin E- prevents common colds