Respiratory System

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Slide 1

The Human Respiratory System

Slide 2

Respiratory System

Slide 3

Respiratory Structures

Diaphragm

Contraction = inhalation

Relaxation = exhalation

Pharynx

Common nasal/oral passageway

Larynx

“Voicebox” containing vocal cords

Trachea

“Windpipe” leading to lungs

Bronchi/bronchioles

Tubes that enter each lung

Alveoli

(1) Millions of capillary‑surrounded sacs where oxygen transfer takes place

Slide 4

Alveolus

Slide 5

Oxygen Transport

Hemoglobin

Protein found in red blood cells

Iron in hemoglobin is capable of weakly binding oxygen

Oxyhemoglobin

Hemoglobin with oxygen bound to it

Oxygen is given up when oxygen concentration around cells gets low

Slide 6

Carbon Dioxide Transport

Transport

10% is dissolved CO2 in the plasma

90% is carried as bicarbonate ion (HCO3-) in the plasma

Elimination

In lungs, bicarbonate is converted back to CO2

CO2 diffuses into alveoli and is eliminated