textbook live frog dissecting tray dissecting instruments frog Ringer's solution electronic stimulator filter paper glass rod glass plate ring stand and ring microscope slides Bunsen burner ice
For Optional Activity:
2% Novocain solution (procaine hydrochloride)
Virtual Physiology Lab: 1, Action Potential
• Wear disposable gloves when handling the frogs and chemicals.
• Keep loose hair and clothes away from the Bunsen burner.
• Wear heat-resistant gloves when heating the glass rod.
• Dispose of gloves, frogs, and chemicals as instructed.
• Wash your hands before leaving the laboratory.
A nerve cell usually is polarized due to an unequal distribution of ions on either side of its membrane. When such a polarized membrane is stimulated at or above its threshold intensity, a wave of action potentials is triggered to move in all directions away from the site of stimulation. This wave constitutes a nerve impulse, and if it reaches a muscle, the muscle may respond by contracting.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.