Vernier Software and Technology
Vernier Software & Technology

Simple Neuromuscular Reflexes

Figure from experiment 4 from Human Physiology Experiments


The automatic response of a muscle to a stimulus is called a reflex. The patellar reflex results from tapping the patellar tendon below the knee with a reflex hammer. This causes contraction of the quadriceps muscle and extension of the leg. Stretching of the muscle activates nerve impulses which travel to the spinal cord. Here the incoming impulses activate motor neurons, which travel back to the muscle and result in muscle contraction. This reflex arc is primarily a spinal reflex, but is influenced by other pathways to and from the brain.

A reflex may be reinforced (a term used by neurologists) by slight voluntary contraction of muscles other than the one being tested. For example, voluntary activation of arm muscles by motor neurons in the central nervous system “spills over” to cause a slight activation of the leg muscles as well. This results in the enhancement of the patellar reflex. There are other examples of central nervous system influences on reflexes. Health care professionals use knowledge of these influences to aid in diagnosis of conditions such as acute stroke and herniated lumbar disk, where reflexes may be absent; and spinal cord injury and multiple sclerosis, which may result in exuberant reflexes.

In this experiment, you will use an EKG Sensor to compare the speed of a voluntary vs. a reflex muscle action and to measure the relative strength (amplitude) of the impulse generated by a stimulus with and without reinforcement. You will make a calculation of nerve impulse speed using data generated by a reflex hammer containing a Force Sensor.used in conjunction with the EKG sensor.


  • Graph the electrical activity of a muscle activated by a reflex arc through nerves to and from the spinal cord.
  • Compare the relative speeds of voluntary and reflex muscle activation.
  • Associate muscle activity with involuntary activation.
  • Observe the effect of central nervous system influence on reflex amplitude.
  • Calculate the approximate speed of a nerve impulse.
  • Compare reflex response and electrical amplitude in different subjects.

Sensors and Equipment

This experiment features the following Vernier sensors and equipment.

Additional Requirements

You may also need an interface and software for data collection. What do I need for data collection?

Human Physiology Experiments

See other experiments from the lab book.

1Body Temperature
2Limb Position and Grip Strength
3Introduction to Electromyography
4Simple Neuromuscular Reflexes
6Homeostasis and Autonomic Reflexes
7Effect of Exercise on Heart Rate
8Introduction to Electrocardiography
9Blood Flow and Skin Temperature
10Respiration and Ventilation
11Ventilation and Heart Rate
12Oxygen Extraction During Respiration
13Effect of Exercise on Oxygen Usage
14Heart Rate and Calories

Experiment 4 from Human Physiology Experiments Lab Book

<i>Human Physiology Experiments</i> book cover

Included in the Lab Book

Vernier lab books include word-processing files of the student instructions, essential teacher information, suggested answers, sample data and graphs, and more.

Buy the Book

Go to top