respiratory system/ pathway of air

respiratory system, what the body needs

supply O2 to body cells, used for cellular respiration

respiratory system, what the body doesn’t need

removes CO2 from our body, too much CO2 can be very toxic

cilia

hairs in the nasal cavity that sweeps out foreign particles

nasal cavity

mucus traps foreign particles and keeps nasal cavity moist

pharynx

hollow area that splits into a trachea and esophagus

trachea/windpipe

a tube that air passes through, supported by cartilage rings that keep the trachea strong

epiglottis

a flap of cartilage that covers trachea to prevent food from entering

larynx/voice box

2 sheet of elastic ligaments, vocal cords

bronchi

branches off from the trachea into the lungs, held open by cartilage rings

bronchioles

can constrict and dilate because they have smooth muscle instead of cartilage rings which makes them flexible

alveoli

responsible for gas exchange, surrounded by capillaries, one cell layer thick to make gas exchange easier, many alveoli to increase surface area

lipoprotein

prevents alveoli from sticking together

diaphragm

sheet of muscle underneath the lungs