Nerve Impulse Stimulation

MATERIALS NEEDED

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

SAFETY

• 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.

Essentials of Human Physiology

Essentials of Human Physiology

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.

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