Which organ in the respiratory system is mainly responsible for gaseous exchange?
lungs
heart
stomach
liver
Which of the following is the main function of the respiratory system?
Transport oxygen and carbon dioxide
digest food
kill bacteria and virus
reproduce offsprings
Where does oxygen enter the blood during breathing?
trachea
nasal cavity
bronchi
air sacs
The human respiratory system includes the heart.
Which of the following will happen during breathing in?
The intercostal muscles relax
The diaphragm moves up.
The ribs moves downwards and inwards.
The gas pressure inside the chest lower than air pressure
The lungs are the main organs of the respiratory system and are responsible for gas exchange.
Sort the air in the order it enters the respiratory system
nasal cavity
trachea
bronchi
air sacs
Please match the following components of the respiratory system with their functions.
nasal cavity
Filter, humidify and warm the inhaled air
trachea
Deliver air to the lungs
air sacs
Carry out gas exchange
diaphragm
Help the lungs expand and contract
bronchi
Deliver air to the air sacs
During breathing out, the __________ ____________ relax, the rib cage moves downwards and inwards.
As shown in the figure, during inhalation the diaphragm assumes a dome-like shape.
As shown in the diagram, arrange in the correct sequence.
intercostal muscles relax,diaphragm becomes dome-shaped
ribs move downwards and inwards
chest volume decreases
the pressure inside the chest increases
air is forced out
Matching
inhale diaphragm move upwards
exhale diaphragm move downwards
When the chest volume increases,the gas pressure inside the chest __________.