I band
In vivo
Incomplete tetanus
Inferior vena cava
Influx
Inhibitory postsynaptic potential (IPSP)
Inorganic phosphate
Inspiration
Inspiratory
Inspiratory center
Integral proteins
Intercalated cells
Intercalated disc
Interlobar artery
Interlobar vein
Interlobular artery
Interlobular vein
Internal respiration
Interneuron
Internodal pathway
Interstitial fluid
Interstitial space
Interstitium
Interventricular septum
Intracellular
Intracellular fluid (ICF)
Intrapleural pressure
Intrapulmonary pressure
Intrinsic conduction system
Involuntary
Ion
Ion channels
Ion pump
Isotonic
Isovolumetric