Procedures For the procedures used in this experiment, refer to Lab 11, activity 3, in the Anatomy and physiology Lab Manual. A 12 year old boy had a reflex time of. The effector is the same muscle that was stretched. It does not matter which one, you will perform this test 3 more times, but never tell your partner which ruler you will drop. In the test the results were normal plantar reflex and not Babinski's 4. The first trial our subject did no activity, this being our control test, it resulted in a five second response to stimuli. Therefore, unless the changes had been extremely less or more vigorous than baseline, it is unlikely that the recorded results could be very accurate.
Repeat data collection until you have obtained a stable baseline for 5 s. If your graph has an unstable baseline, click and repeat data collection until you have obtained a stable baseline for 5 s. Use a quick, firm tap to the tendon to elicit an involuntary kick out. To achieve this, the subject was asked to grab a tight hold on the edge of the lab bench on either side of the legs with both hands and use all strength to pull upwards on the bench. As before, your partner must only squeeze one hand. The left pupil was also smaller. A total of 10—15 reflexes should appear on the graph.
For example: Individual 1 improved from having an average reflex time of. Align the Examine line with the first high peak which corresponds to the first kick in the Accelerometer graph. Fast reaction times can produce big rewards, for example, like saving a blistering soccer ball from entering the goal. We tested the strength of the knee reflex activity and whether it was affected by mental distraction, muscular fatigue or simultaneous muscle activity. If this was the case, the stimulus cannot send the impulse to motor neurons which will not cause the muscle to produce a contraction for a knee jerk.
It is quite difficult to observe this phenomenon during rotation of the head. Make sure your partner has the eye shades on. As you remove your right hand, what happens to the size of the pinhole in the index card? In a misogynistic reflex arc, there is only one motor neuron and one sensory neuron, which form a single chemical synapse. One example of a reflex is the patellar stretch reflex. Rotate the subject to the right for about 20 seconds at a rate of one turn every two seconds. The knee reflex arc is a spinal reflex, and the circuit is drawn above.
However I did think that hitting the knee straight on would be faster than hitting it straight on while pulling your arms. Conduction velocity refers to a test done to find out how fast electrical signals can travel through a nerve in the body. This time using both rulers. The nerve that is carrying the efferent impulse is the motor nerve of the femoral nerve. Allow each individual to have 5 test runs to get used to the system. Finally, explain how the response that you observe would increase the fitness of the organism that demonstrates it. The strength of the reflex was recorded as either equal to, more vigorous than, or less vigorous than the baseline reflex and the results were put into a simple chart.
The strength of the patellar reflex after imposing muscle fatigue compared with the baseline strength was less vigorous. Have your partner sit at the table as before, also be sure your partner puts on the eye shades. The results of the experiment did not support the hypothesis for mental distraction or the effect of simultaneous muscle stimulation in another area of the body, which had a more vigorous response. Even though all of the results were under a third of a second, they still varied in time. Allow each individual to have 5 test runs to get used to the system. What is the direction of the slow and fast phases of nystagmus? Instead of a natural reaction in which you have no control over, conscious actions use the brain much more.
Our spinal cord partners with sensors in our muscles, called muscle spindles, to keep track of where our bodies are in space and how stretched or contracted our muscles are. Find the average reflex time of each individual. Close the click Examine box by clicking the × in the corner of the box. Hold the ruler at the 30 cm mark so that the 0 cm end is just at your friend's index finger. However, it is supported that there are other factors that will change the results of a patellar reflex test.
Does that affect the speed or amplitude at all, or does the reflex even happen? Lab Report: Understanding Photosynthesis Gen Biology Lab Abstract: This lab was called photosynthesis: understanding photosynthesis. Two 13 year olds, one boy and the other girl, had reflex times. The result was videotaped in order to view the tapping after the experiment was completed. With a new subject, repeat the procedure with the head bent to the right should at about a 90-degree angle. You may be asking how a knee reflex arc and a soccer player dealing with an oncoming ball are different. The changes were not vastly different in any of the three tests. This word refers to the movement of the eyes resulting from the stimulation of the hair cells in the semicircular canals.
The same person performed the patellar reflex test; however it was to a professional. They then send signal s alonq a sensory nevron to your spinal cord, where the siqnal are passed on to a motor nevron. The mixtures with… 3168 Words 13 Pages for the lab. Blinkinq when something moves quickly towards your face is a reflex action too. Our results showed that the reflex reinforcement had the highest results over without reinforcement. The vision part of the cerebral cortex interprets the images and sends messages to the motor part of the cortex which runs down the spinal cord.
If your graph has an unstable baseline, click and repeat data collection until you have obtained a stable baseline for 5 s. Movinq quickly away from something that causinq you pain, like when you back into a prickel bush is another action. There are four groups of effectors: skeletal muscle, smooth muscle, cardiac muscle, and glands the first is called a somatic effector while the latter three are called visceral effectors. In a young, healthy person, it takes 15-30 milliseconds for the stretch stimulus to produce a muscle contraction, by comparison it takes 5-10 times that long to blink your eye in responses to a stimulus, or 150-300 milliseconds. Allow your partner to sit on the table with the legs suspended or crossed. An increase in mental excitement leads to an increase in the velocity of the patellar reflex as shown in the graph above.