Circulatory & Respiratory Systems - CrashCourse Biology #27
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Added 9 years ago
kkryan
in
science GIFs
#INHALE
#animals
#Blood
#Heart
#Biology
#muscle
#breathing
#breath
#Vlogbrothers
#pressure
#PUMP
#exhale
#aorta
#crashcourse
#membrane
#lung
#oxygen
#lungfish
#Circulation
#respiration
#vein
#trachea
#capillary
#larynx
#diaphragm
#artery
#atrium
#alveolus
#pulmonary
#ventricle
#bronchus
#bronchiole
#thoracic
#endotherm
#ectotherm