respiratory system Flashcards
(5 cards)
1
Q
what happens when you breathe in
A
-intercostal muscles and diaphragm contratc
-thorax volume increases
-decrease pressure drawing air in
2
Q
what happens when you breathe out
A
-intercostal muscles and diaphragm relax
-thorax volume decreases
-air is forced out
3
Q
how are alveoli adapted for gas exchange
A
-large SA
-moist lining for gases to dissolve in
-one cell thick- short diffusion distance
-great blood supply for conc gradient
-walls are permeable-easy diffusion
4
Q
what is th order of respiration
A
mouth - trachea- bronchi- bronchioles- alveoli
5
Q
what protects the lungs
A
-diaphragm and intercostal muscles
