SCIENCE 9 - RESPIRATORY SYSTEM

Air enters (a)   , is filtered by hairs, warmed, moistened, and sampled for odors as it flows through a maze of nasal passages.

Each bronchus leads into a lung and branches into smaller and smaller (a)   , resembling an inverted tree.

(a)   are air sacs at the end of bronchioles where gas exchange takes place.

•At the bottom of the cavity is a large, flat muscle known as the (a)   .

(a)   is the actual mechanical intake of air.

One of the functions of Respiratory system is to takes up oxygen from air and supplies it to blood (for cellular respiration).

• TRUE

• FALSE

Most of the time, the pathway for air is open, except when we swallow.

• TRUE

• FALSE

The pharynx contains vocal cords, which allow us to make sounds by voluntarily tensing muscles.

• TRUE

• FALSE

Other term for trachea is windpipe.

• TRUE

• FALSE

Carbon dioxide in the blood diffuses into the alveolus.

• TRUE

• FALSE