Check this reflex by gently dorsiflexing a classmate’s foot then using a reflex hammer to strike the Achilles tendon. What was the result? Do you normally get the observed reaction when the gastrocnemius muscle is contracted?

Where are the lower motor neuron cell bodies that innervate the medial rectus muscle located? Abducens nucleus Oculomotor nucleus Facial nucleus Trochlear nucleus

What do you mean by abductor muscles?

The ocular muscle has a very fast response time compared to the gastrocnemius and soleus muscles. What is the use for this? The muscle needs to react fast in order to respond quickly to external stimuli. The ocular muscle is quite thin and can easily twitch. The gastrocnemius muscle has too much muscle mass to be able to respond quickly. The soleus muscle is far away from the brain compared to the ocular muscle.

A physically active 13-year-old boy is complaining of pain at the posterior heel below the attachment of the achilles tendon. What are the possible reasons for his pain and what is the most likely cause? Explain your reasoning. What is the anatomical significance of the location of his pain? Does his age make a difference in how he should be managed? Are there any risks in ignoring the problem? Are there other locations in the body in which similar conditions occur?

1)Explain why the stretch reflex is an important concept to understand in order to enhance your flexibility? 2)What are the three legs of the body composition stool?  What specific behaviors or factors do you need to address to apply these to your life as young adult?

What is the functional reason why the muscle group on the dorsal leg (calf) is so much larger than the muscle group in the ventral region of the leg?

a) Describe how the isolated muscle behaved as the stimulus interval was further decreased. b) What is tetanus? Explain the mechanism behind this phenomenon. c) At which stimulus interval did you observe tetanus? What frequency of stimulation does that correspond to?

To demonstrate muscle fatigue, a student held an 8 lb dumbbell in her hand and abducted her arm parallel to the floor. After 45 seconds, she has having difficulty holding that position so she rotated her hand 90 degrees. This allowed her to hold the dumbbell in position for an additional 20 seconds. Which of the following is the best explanation for this? A. Different motor units were contracting while others were relaxing.   B. Muscles began to contract isotonically rather than isometrically.   C. The load was reduced.   D. The resistance to contraction was reduced.   E. The change in position provided a greater range of motion at the shoulder.

What would happen without input from gamma motor neurons? A) Information about velocity would continue, but information about length would no longer be possible. B) The spindles would be unable to provide feedback as the muscle contracted. C) Neither the intrafusal nor extrafusal fibers would contract. D) The extrafusal fibers would not contract, but the intrafusal fibers would continue to contract.