Nerve force

... via dual innervation: First from sympathetic nervous system (Spinal nerve T1-4) Second from parasympathetic nervous system(Cranial nerve CN-X) ... like (anger,stress.....etc.) lead to increase heart rate and force of contraction Conditions that lead to parasympathetic stimulation ...

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... which has little to do with the vagus (parasympathetic division) nerve, even if it's cut; then, yes, HR will increase, reflecting inherent rate of SA note (100beats/min), but the force of contraction will remain the same? Am I on the right path??

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Cutting the vagus nerve to the heart increases heart rate. What effect would it have in the force of contraction of the heart? Please explain the answer, anyone????????

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Cutting the vagus nerve to the heart increases heart rate. What effect would it have in the force of contraction of the heart? Please explain the answer, anyone????????

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Hello! Does a muscle contract stronger when the frequency of the nerve impulses is higher? (Just a guess; Please enlighten me if I am wrong) ... things: - a motor unit is either ON or OFF. There is no gradation of force produced by a motor unit by varying the level of motoneuron excitation ...

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