Demonstration A The Kymograph

1. Observe the kymograph and, at the same time, study figure 19.1 to learn the names of its major parts.

2. Note that the kymograph consists of a cylindrical drum around which a sheet of paper is wrapped. The drum is mounted on a motor-driven shaft, and the speed of the motor can be varied. Thus, the drum can be rotated rapidly if rapid physiological events are being recorded or rotated slowly for events that occur more slowly.

A stylus that can mark on the paper is attached to a movable lever, and the lever, in turn, is connected to an isolated muscle. The origin of the muscle is fixed in position by a clamp, and its

Figure 19.1 Kymograph setup to record frog muscle contractions. Drum .

Muscle clamp (for origin)

Muscle Paper Stylus

Signal marker Shaft

Weight Motor

Figure 19.1 Kymograph setup to record frog muscle contractions. Drum .

Muscle clamp (for origin)

Muscle Paper Stylus

Signal marker Shaft

Weight Motor

Muscle Clamp Kymograph

Muscle lever

Stimulator

Muscle lever

Stimulator insertion is hooked to the muscle lever. The muscle also is connected by wires to an electronic stimulator (or inductorium). The stimulator can deliver single or multiple electrical shocks to the muscle, and it can be adjusted so that the intensity (voltage), duration (milliseconds), and frequency (stimuli per second) can be varied. Another stylus, on the signal marker, records the time each stimulus is given to the muscle. As the muscle responds, the duration and relative length of its contraction are recorded by the stylus on the muscle lever.

3. Watch carefully while the laboratory instructor demonstrates the operation of the kymograph to record a frog muscle contraction.

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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Responses

  • isaias
    How to set kymograph with muscle livwr?
    6 years ago
  • COTTAR NOAKES
    What is a drum shaft in a kymograph?
    6 years ago

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