human gas exchange system (ventilation) Flashcards
what are all of the parts of the human gas exchange system
BORRD PLANT
nasal cavity
bronchiole
pharynx
larynx
oral cavity
right bronchus
left bronchus
alveloli
diaphragm
trachea
right lung
where is the site of gas exchange
the alveoli
where does oxygen diffuse out of,and into
out of the blood and into the alveoli and into the blood capillaries
what are alveoli adapted to do
maximise the rate of diffusion
wha t does the large no. of alveloi in the lung do
it increases surface area
what does blood in the capillioary network do
it transports oxygen awa yfrom the alveoli maintaining a conc. gradient
what does ventilation do
brings oxygen to the alveoli-maintaining a conc. gradient
how thick are the capillary endothelium and alveoli endothelium and what does this mean
one cell thick,this means they have a short diffusion pathway
how is the lungs having many alveoli an adaptation
increased surface area
how does the alveoli epithelium and capillary endothelium being one cell thick help increase rate of diffusion
short diffusion pathway
how does flow of blood through capillary network and ventilation increase rate of diffusion
steep conc. gradient
what do external intercostal muscles do
contract to move the rib cage up and down during inhalation
what are the two types of intercostal muscles
internal and external
what do internal intercostal muscles do
contract to move the ribcage down and in (further) during forced expiration
what type of muscle process is inhalation
active
