Unit 3 firdt vocab Flashcards
all the organs needed to bring oxygen into the body when breathing occurs
respiratory system
a gas in the air needed for muscles and other cells to carry out their functions
oxygen
a by product of cellular activity in the muscles that interferes with normal muscle function and causes cramping, but which can be oxidized and eliminated if a plentiful supply of oxygen reaches the muscles
lactic acid
air entering here is filtered, warmed, and moistened before it moves on to the lung
nasal cavity
the chamber where the passages from mouth and nose meet leading from the nasal passages and mouth down to the larynx and trachea
pharynx
the voice box, containing vocal cords that vibrate and make sounds
larynx
the windpipe leading from the head down to the lungs; it is lined with rings of cartilage to prevent it from collapsing
trachea
a flap of elastic tissue that forms a lid over the larynx as it branches to the trachea. When breathing, the flap stays open; when eating, it is closed to keep food from entering the lungs
epiglottis
smaller tubes that branch from the trachea to the lungs
bronchi
tiny hairs in the nasal passages, trachea and bronchi that help trap and remove dust particles
cilia
two sponge-like organs divided into lobes that surround the heart in our chest cavity
lungs
smaller branches inside the lungs that carry air to the alveoli
bronchiole
air sacs where oxygen enters and waste materials leave the blood stream
alveoli
a sticky, thick fluid that lines much of the respiratory system. It traps dust and dirt particles, and is moved by cilia out of the respiratory area to be swallowed and destroyed in the stomach by gastric juices
mucus
a large muscle under the lungs that expands the chest cavity to allow more air into the lungs
diaphragm
