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PHYSIOLOGY IUPUI DR. CLARK Ch. 14 EXAM 3 Verified Questions and Correct Answers (2025/2026)
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Sympathetic System affects the HEART using what? - 1. Catecholamines - Norepinephrine (neurons) Epinephrine (adrenal gland) B1 receptors / activity of I(f) (ion-funny channels) --> / Na+ & Ca+ permeability --> DEPOLARIZES FASTER 2. / CONDUCTION VELOCITY 3. / CONTRACTILITY / Ca+ permeability Why does the Sympathetic System increase contractility in the heart? - it increases Ca+ permeability- therefore calcium gets into the contracting cells quicker. The more calcium present, the harder the contraction is going to be.
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