respiratory system vocab

tidal volume

amount of air inhaled or exhaled with a normal breath

surfactant

chemical substance coating the pulmonary alveoli walls that reduces surface tension, thus preventing collapse of alveoli

expiration

the act of expelling air from lungs

parietal pluera

lines wall of thoracic cavity

bronchi

large branches off the trachea leading to the lungs

respiration

the act of breathing

visceral plura

membrane the envelopes the lungs

inspiration

the drawing of air into the lungs

vital capacity

volume of air that can be expelled from the lungs by forcible expiration after the deepest inspiration

hemoglobin

oxygen transporting pigment of erythrocytes

inspiratory reserve volume

amount of air inhaled forcibly over normal inhalation

nostrils

openings through which air will enter and leave the nasal cavity

Nasal conchae

bony ridges within the nasal cavity that serve to increase the surface area over which inhaled air moves

Paranasal sinuses

mucous-lined cavities within the skull bones that serve to lighten the weight of the skull

larynx

houses the vocal folds (cords) which produce sound. Conducts air in and out of trachea

Pharynx

another name for throat region; passageway for food traveling from oral cavity to esophagus and for air passing between nasal cavity and larynx

nasal cavity

mucous lined cavity that serves to warm, moisten, and filter inhaled air

epiglottis

flap like tissue that covers opening of the windpipe when swallowing food or drink

Trachea

another name for windpipe; transports gases to and from the lungs; contains cartilage rings to prevent it from collapsing or blocking airway

bronchial tree

branched airways leading from trachea to the alveoli in the lungs

lung

spongy cone shaped organs that contains air passages, alveoli, blood vessels, and other structures necessary for gas exchange between cells and atmosphere

hard palate

serves to separate the nasal and oral cavities; formed by the maxillae and palatine bones

alveoli

microscopic air sacs that serve as a site of gas exchange within lungs

uvula

flap like tissue hanging from the soft palate that blocks food and water from entering the nasal cavity