The mechanism of breathing Flashcards
Why is the process of breathing in. and out separated?
so the body can concentrate
on the two tasks in turn.
Does the breathing system have a fixed shape?
No, It has the ability to move, whilst remaining enclosed within the protection of the ribcage
Which two muscles bring about pressure changes in the lungs?
diaphragm
intercostal muscles
What is the diaphragm?
a sheet of muscle that separates the
thorax and the abdomen
What are intercostal muscles?
What type of intercostal muscles are there and what are they responsible for?
muscles present in the ribcage
internal intercostal muscles: RELAXATION leads to expiration
external intercostal muscles : CONTRACTION leads to
inspiration
Where is the diaphragm located?
What’s the shape of it before we inhale and after we inhale?
beneath the lungs, which means
that it separates the thorax from the abdomen.
———————————-
Dome shape before
Flat shape after
What happens to the volume of the thorax when we inhale?
increases
what changes happen when we inhale?
1-thorax volume increases
2-diaphragm flattens
3-internal air pressure decreases
4-external pressure is higher than internal
5-air diffuses into the lungs
What do chemoreceptors detect?
what do they do?
Increased acidity in the blood
and decreased pH is detected
They send messages to the
INSPIRATORY CONTROL
CENTRE in the Medulla
Oblongata to increase
INSPIRATION
what do PROPRIORECEPTORS detect?
Movement in the joints
what do THERMORECEPTORS detect?
an increase in temperature
which causes an increase in
respiratory rate
What do BARORECEPTORS (stretch
receptors) detect?
What do they do?
stretch in the lungs
stimulating the EXPIRATORY CONTROL CENTRE to increase EXPIRATION.
