structures

Question 1

nasal cavity

Answer 1

nostrils to the back of the throat
warm, moisten and clean incoming air
lined with ciliated cells and mucus-secreting cells
a large number of blood vessels inside the nose warms the incoming air

Question 2

pharynx

Answer 2

separates trachea (windpipe) and esophagus a passageway for air into the respiratory system and food in the digestive system. 
also known as the throat

Question 3

larynx

Answer 3

thin sheets of elastic ligaments
vocal cords
during speech muscles contract and move them together.

Question 4

trachea

Answer 4

windpipe that connects the pharynx and the larynx to the lungs allowing the passage of air

Question 5

lung

Answer 5

surrounded by a pleural membrane, which attaches the lungs to the thoracic cavity.
transfers air from the atmosphere and into the blood stream

Question 6

right/left bronchi

Answer 6

extensions of the windpipe that shuttle air to and from the lungs.

Question 7

bronchioles

Answer 7

tubes from the lungs that branch off from the larger bronchi.
divides into a smaller and smaller passageway that carry air into all portions of the lungs
lack rings of cartilage
smooth muscles can change the diameter

Question 8

alveoli

Answer 8

tiny sacs where gas exchange between air and blood occurs
walls are very thin and surrounded by capillaries
carbon dioxide and oxygen transfer between alveoli and capillaries through diffusion

Question 9

pleural membrane

Answer 9

double layer membrane that encloses the lungs

Question 10

cilia

Answer 10

tiny hair cells that filter out dust and other air particles

Question 11

diaphragm

Answer 11

it contracts and flattens when you inhale and then relaxes when you exhale.