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
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 human respiratory system includes the heart.
The lungs are the main organs of the respiratory system and are responsible for gas exchange.
As shown in the figure, during inhalation the diaphragm assumes a dome-like shape.
During breathing out, the __________ ____________ relax, the rib cage moves downwards and inwards.
When the chest volume increases,the gas pressure inside the chest __________.
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
Arrange in the order in which air enters the respiratory system
nasal cavity
trachea
bronchi
air sacs
Matching
inhale diaphragm move upwards
exhale diaphragm move downwards
Please match the following components of the respiratory system with their functions.
nasal cavity
Filter, humidify and warm the inhaled air
trachea
A tube that enters the chest and allows air to flow into the lungs
air sacs
Carry out gas exchange
diaphragm
Help the lungs expand and contract
bronchi
Deliver air to the air sacs