Connect the Accelerometer to the reflex hammer using the cable tie.
The reflex arc Regardless of the nature of an individual reflex, all reflexes are carried out by an arrangement of neurons called a reflex arc. The reflex arc provides for the detection of some stimulus and the appropriate response to that stimulus.
There are five components of the reflex arc: Receptor--this is the sensory structure which detects the Patellar lab report.
In some reflexes the nature of the stimulus is not immediately obvious to the casual observer. Afferent pathway--this is the sensory pathway that carries the information from the receptor structure to the central nervous system. Integrating center--this is a chain of one or more neurons in the CNS that route the information to the appropriate region in the brain or spinal cord for sending out the response message.
Efferent pathway--this is the motor structure that carries the impulse out of the CNS. Effector structure--this is the organ that carries out the effects of the impulses sent by the CNS. There are four groups Patellar lab report effectors: The autonomic nervous system is composed of the efferent pathways to all of the various visceral effectors.
In this lab exercise you will have the opportunity to examine a few reflexes found in vertebrates. As you go through these demonstrations, think about the characteristics of reflexes that you came up with on the first page--how many of them apply to each reflex you are demonstrating?
Also, try to identify each component of the reflex arc in each of the reflexes in many cases this is not known, but receptors and effectors should be fairly easy to figure out! Finally, explain how the response that you observe would increase the fitness of the organism that demonstrates it. Muscle Stretch Reflex Stretch reflexes are initiated by the stimulation of stretch receptors found in the muscles and tendons.
These reflexes are unique in vertebrates in that they have no integrating center; the afferent pathway forms a synapse with the efferent pathway in the ventral gray horn of the spinal cord.
The effector is the same muscle that was stretched. Here is a link to that presentation. We will use this same reflex at the end of the lecture discussions of the nervous system to demonstrate how the contraction of muscle can be adjusted without change in stimulation from the CNS.
Have your partner sit in a chair or on the edge of a table with legs crossed at the knee. Find the patella with your fingers; gently but firmly tap the patellar tendon in the shallow depression immediately below the patella.
Do this with both knees. Is there a noticeable difference in the response of the two sides? This is done by clasping the fingers of the hands together like the couplings of train cars and vigorously trying to pull the hands apart while the tendon is being tapped.
What is the response and how do you explain it? Have your partner kneel on a chair, gently holding on to the back of the chair while the feet hang over the front edge. The feet should be as relaxed as possible. Tap the Achilles tendon lightly.
What is the response? How is this similar to the patellar reflex? Eye Reflexes Pupillary reflex. Have her quickly remove her hand as you carefully observe the pupil in the right eye.
What happened to the size of the pupil? Why did this happen? Be careful how you answer this question. Have your partner cover his right eye for another 30 seconds.
This time, observe the pupil in the left eye. This is described as a consensual reflex. You can observe these responses in your own eye.
Make a pinhole in an index card.
Hold it up very close to your left eye so that you can see through the pinhole. Cover your right eye for 30 seconds.Mar 11, · The patellar reflex results from tapping the patellar tendon below the knee with a reflex hammer which causes contractions of the quadricep muscles and extension of the legs.
Stretching of the muscle activates nerve impulses which travel to . The third piece is a motor, or efferent neuron.
Report abuse. Transcript of Reflex Lab. Introduction Materials and Methods Results Discussion References When a doctor taps the patellar tendon, sensory signals travel through a sensory neuron to the spinal cord. The signals then travel through synapses to motor neurons. Reflex and Sensory Physiology Purpose: What is the purpose of this exercise? The purpose of this exercise is to learn about how reflexes and senses are used together. We use these sense every day and rarely understand how much they contribute to our bodies and help us to function normally. Are there any safety concerns associated with this 86%(14). The familiar knee-jerk reflex, tested routinely by physicians, is a spinal reflex in which a brief, rapid tap on the knee excites muscle spindle afferent neurons, which then excite the motor neurons of the stretched muscle via a single synapse in the spinal cord.
The motor neuron will take the information received from the interferon and send it on to its effectors (muscles or glands), which will activate a response. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report.
The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.
Our experiment was concerned with the reflex response in humans, and how it compares to a voluntary neural pathway as well as how it is enhanced by what is known as the Jendrassik Maneuver. Lab Exercise on Reflexes. In this lab exercise you will have the opportunity to examine a few reflexes found in vertebrates.
Find the patella with your fingers; gently but firmly tap the patellar tendon in the shallow depression immediately below the patella. Introduction The aim of this experiment was to familiarize students with the techniques of writing a lab report and to understand how the patellar reflex helps in preventing the stretching of quadriceps.