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) Responses digestive system digestive system cardiac system cardiac system respiratory system respiratory system endocrine 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.
The diaphragm
Which of the following statements best describes how oxygen enters the lungs? (1 point) Responses 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 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 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 bronchi, which branches into two tubes called the bronchioles. Oxygen enters the lungs through the trachea, which branches into the alveoli.
Oxygen enters the lungs through the trachea, which branches into two tubes called the bronchi, which lead to the lungs.
External respiration takes place in the ____________________. (1 point) Responses bronchi bronchi trachea trachea alveoli alveoli diaphragm diaphragm
External respiration takes place in the alveoli.
Oxygen is carried by the ______________, which is part of the red blood cell.
Oxygen is carried by the hemoglobin, which is part of the red blood cell.
Select the answer below that best describes how the lungs are kept free of germs and dirt from the air. (1 point) Responses The alveoli act as filters for the lungs collecting particles of dirt and germs to be exhaled when the diaphragm relaxes. 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. 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. 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.
