Heart: 'tropic' meanings
- Lusitropic: loose is relaxed. So it refers to 'Relax heart'.
- Inotropic: when heart wall contracts, it moves inward. Refers to 'Contract heart'.
- Chronotropic: 'chrono-' means 'time'. Refers to 'Heart rate' (of SA node impulses).
- Dromotropic: only one left, it refers to 'Conduction speed' by default.
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|Starling’s law of heart: energy of contraction is proportional to the initial length of cardiac muscle fibre|