A)
The primary function of the _________________ is to supply the blood with oxygen so that the blood can deliver oxygen to all parts of the body.
(1 point)
digestive system
cardiac system
respiratory system
endocrine system
The correct answer is the respiratory system.
The ___________ is a strong wall of muscle that contracts to create a suction in the chest to draw in air and expand the lungs. When the muscle relaxes, the chest
cavity decreases and the air is pushed out.
A
The correct answer is the diaphragm.
A)
Which of the following statements best describes how oxygen enters the lungs?
(1 point)
Oxygen enters the lungs through the trachea, which branches into two tubes called the bronchi, which lead to the lungs.
Oxygen enters the lungs through the diaphragm, which branches into two tubes called the trachea.
Oxygen enters the lungs through bronchi, which branches into two tubes called the bronchioles.
Oxygen enters the lungs through the trachea, which branches into the alveoli.
The correct answer is: Oxygen enters the lungs through the trachea, which branches into two tubes called the bronchi, which lead to the lungs.
A)
External respiration takes place in the ____________________.
(1 point)
bronchi
trachea
alveoli
diaphragm
The correct answer is the alveoli.
Oxygen is carried by the ______________, which is part of the red blood cell.
A
The correct answer is the hemoglobin.
A)
Select the answer below that best describes how the lungs are kept free of germs and dirt from the air.
(1 point)
The alveoli act as filters for the lungs collecting particles of dirt and germs to be exhaled when the diaphragm relaxes.
Tiny hairs known as cilia clean the trachea of dirt and germs before it can enter the lungs.
Hairs known as cilia, found inside the alveoli, collect the dirt and germs to be expelled from the lungs.
Mucus found in the bronchial tubes collects dirt and germs that gets into your lungs. Tiny hairs called cilia work to sweep out the debris collected to keep
your lungs clean.