Respiratory System Flashcards
What’s the pharynx
A tube that leads from back of nose and mouth to oesophagus posteriorly and larynx anteriorly
Pharynx length
12.5cm
At the back of the pharynx that connects to the nose are
Lymphoid tissue which forms the pharyngeal tonsils
Pharynx function
Air passage
Warm and moisten air
Larynx is
Voice box
Larynx structure
Rings of cartilage
Thyroid cartilage is
Top of larynx
Trachea is
Continuation of larynx
Trachea length
10cm
Trachea leads to
Bronchi of lungs
Trachea structure
Hyaline cartilage rings
Involuntary muscle
Connective tissue
Trachea is lined with
Epithelium
During expiration the external intercostals
Relax
When external intercostals relax the ribs fall down and in and size of chest
Decreases
What are respiratory nerves called
Chemoreceptors
Where are the chemoreceptors
Aorta and carotid artery
What do the chemo receptors do
Send impulses to respiratory centre in medulla oblongata of brain
What triggers the nerve
When co2 or oxygen is too high or low
What parts of the brain control breathing
Medulla oblongata
Pons
What’s the process of inhaling
Nerve detects low oxygen Diaphragm contracts Air sucked into lungs Nerve cells called stretch receptors in lung tissue are stimulated Receptors communicate with pons Sends impulses to diaphragm to relax
Composition of air that comes into the body
21pc oxygen
0.04pc co2
Air that leaves the body composition
15pc oxygen
4pc c02
