Pathway of breathing

Question 1

Nose

Answer 1

Hairs filter for dust and particles
- Tissues moisten and warm the air

Question 2

Pharnyx

Answer 2

• A pathway for both air and food
• Two branches: trachea (air) and esophagus (food)

Question 3

Larnyx

Answer 3

• Passageway for air only
• Located in the neck
• covered by the epiglottis to prevent choking
• Voice box and responsible for speaking

Question 4

Trachea (wind pipe)

Answer 4

• A straight tube in the chest cavity
• Its made up of cartillage so it wont collaspe (stong)
• Branches off into the lungs

Question 5

Bronchi

Answer 5

• Made of cartillage so it wont collaspe
• The trachea divdes into 2 branches called bronchi
• Cells lining the bronchi and trachea secrete mucus to trap the foregin particles in the air
• Mucus is directed upwards by the cilias (tiny hairs like fiber), the mucus will get pushed to the eppiglottis, and it will open so that the mucus can travel to the espohagus to be swallowed and digested

Question 6

Bronchioles

Answer 6

The bronchis they divide into a smaller group in the lungs (which are bronchioles)

Question 7

Alveoli

Answer 7

• Bronchioles end in clusters of air sacs
• Where gas exchange occurs
• surrounded by cappilaries
• increases the surface of the lung
• helps to increase the rate of gas exchange
• When the air reaches the alveoli it has alreayd been warm at a temp of 37 degree celcius and its saturated in moisture
• Its important for the air to moist your body cant breathe if its not dissolved in water. (oxygen cannot diffuse across the membrane)

Question 8

Characteristics in gas exchange surfaces

Answer 8

• Increase surface area: alveoli create surface area
• Short diffusion disstances: Alveoli are only one cell thick
• Higher concentration gradient: oxygen will always travel through higher concentration rather than lower concentration
• There is a higher concentration oxygen in the lungs than the blood