. Compare the action potentials of contractile cardiac muscle, autorhythmic cardiac muscle and skeletal muscle.
4. Explain the Frank-Starling law of the heart. How are the urinary bladder, internal and external urethral sphincters innervated? One sphincter is skeletal muscle, regulated by the somatic nervous system, and under voluntary control. Which sphincter is this? How is the other sphincter regulated? What is the detrusor muscle and what is its role in the micturition reflex and urination?

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