Respiratory system is composed of what?
Composed of the conducting passages of the nose and throat and lungs
what is the Function of the respiratory system
to exchange gases with the blood
Oxygen (O2) enters with inhalation
CO2 leaves with exhalation
Upper respiratory tract is
Nostrils → nasal cavity (warmed, humidified, filtered) → pharynx (throat) → glottis (entrance of the respiratory system → larynx > vocal folds
Lower respiratory tract
Trachea → bronchi (right and left) → bronchioles (finer passages that get smaller and branch out → alveoli (functional part of RS)
Gas exchange occurs in the
Alveoli
Each alveolus gets _____
a capillary over it
Inhaled air has
higher O2 than blood
Blood passing over the alveolus has
higher CO2 than air
The large number of alveoli and their round shape create
a lot of surface area for gas exchange
Breathing can be described as
contractions of the diaphragm and rib muscles increase the volume of the thoracic cavity resulting in an inhalation