science q1 w1 - process of respiration, pathway of air (respiratory system)

Breathing

Oxygen and carbon dioxide are exchanged between the external environment and body cells through?

Breathing

It is a physical process of getting air in (inhalation) and out (exhalation) of the lungs.

Inspiration/Inhalation

It is the movement of air from the external environment, through the airways, and into the alveoli.

Expiration/Exhalation

It is the movement of air out of the lungs and into the external environment.

contracts, expand

When you breathe in or inhale, the diaphragm muscle __________ causing the chest to _________. There is now more space and less air pressure inside the lungs.

relaxes, contract

When you breathe out or exhale, the diaphragm muscle ________ causing the chest to __________ or return to its original size. There is now less space and greater air pressure inside the lungs.

External and internal respiration

Name the two stages of respiration.

External respiration

It is the exchange of gases between the air and the blood.

Internal respiration

It is the exchange of gases between the blood and the cells.

Alveoli

Where does external respiration take place?

Capillaries

The surfaces of the alveoli in external respiration are covered with a network of tiny blood vessels that are called?

A. they are exhaled

When we breathe in, we inhale many gases including oxygen. What happens to the gases that the body cannot use?

A. they are exhaled

B. they are changed into oxygen by the lungs

C. they circulate through the body and are disposed of later

D. they are absorbed into the digestive system and used to create energy

C. oxygen is exchanged for carbon dioxide

What important activity takes place in the lungs?

A. food is digested

B. liquid waste is filtered from the blood

C. oxygen is exchanged for carbon dioxide

D. the trachea is exchanged for the larynx

A. exhalation

When the diaphragm contracts (is pulled downward), ________ occurs.

A. exhalation

B. inhalation

C. hiccup

D. the lungs deflate

D. pharynx

What part of the body refers to the space at the back of the mouth that leads either to the airway or the esophagus?

A. conchae

B. larynx

C. nasal cavity

D. pharynx

A. alveoli

At what location does oxygen from the air enter the bloodstream?

A. alveoli

B. cardiac notch

C. paranasal sinuses

D. pulmonary vein