Lab #7 The Muscular System

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Lab 7 The Muscular System
BIO201L
Student Name: Click here to enter text.
Kit Code (located on the lid of your lab kit): Click here to enter text.
Pre-Lab Questions
”1. How do banding patterns change when a muscle contracts?”
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”2. What is the difference between a muscle organ, a muscle fiber, myofibril and a
myofilament? ”
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”3. Outline the molecular mechanism for skeletal muscle contraction. At what point is ATP used
and why? ”
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”4. Explain why rigor mortis occurs. ”
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Experiment 1: Tendons and Ligaments
Post-Lab Questions
”1. Label the arrows in the slide images below based on your observations from the
experiment. ”
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Lab 7 The Muscular System
BIO201L
Lab 7 The Muscular System
BIO201L
”2. How does the extra cellular matrix of connective tissues contribute to its function? ”
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”3. Why are tendons and ligament tissues difficult to heal? ”
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”4. What difference do you see between the tendon – muscle insertion image and the tendon
image? ”
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”5. What differences do you see between the tendon and ligament sections? ”
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Lab 7 The Muscular System
BIO201L
Experiment 2: The Neuromuscular Junction
Post-Lab Questions
”1. Are there few or many nuclei at the end plate? ”
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”2. What is a motor unit? ”
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”3. How is a greater force generated (in terms or motor unit recruitment)? ”
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”4. What types of sensors are present within the muscle to identify how much force is
generated? ”
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Experiment 3: Muscle Fatigue
Table 1: Experimental Counts
Predicted
Value
Actual Value
Trial 1
Trial 2
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Trial 3
Trial 4
Trial 5
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Post-Lab Questions
”1. How did the predicted results compare to the actual results? ”
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”2. Did you notice any changes in the number of repetitions you could perform, or how your
hand felt after each of the trials? ”
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”3. Explain the actions that were occurring at the cellular level to produce this movement.
Include sources of energy and any possible effect of muscle fatigue. ”
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”4. Hypothesize what would happen if blood flow was restricted to the hand when this
experiment is performed. ”
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Lab 7 The Muscular System
BIO201L
Experiment 4: Gross Anatomy of the Muscular System
Table 2: Gross Anatomy Data
Movement
Muscle(s) Activated
Action(s) of Muscle(s)
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3. Fingers Retracted (Step 1)
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4. Forearm Pressed Down
Upon (Step 2)
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5. Elbow Bent (Step 3)
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1. Forearm Extended (Step
1)
2. Fingers Extended
and Splayed (Step 1)
6. Arm Raised to Side with
Heavy Object (Step 4)
7. Arm Extended Back with
Heavy Object (Step 4)
Lab 7 The Muscular System
BIO201L
Experiment 5: ATP and Muscle Fatigue
Table 3: Muscle Fatigue Data
Trial
Time (seconds)
Trial 1
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Trial 2
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Trial 3
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Post-Lab Questions
”1. What happened to the time intervals between Trial 1 and Trial 3? What caused this
change? ”
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”2. Identify three muscles which were engaged during the wall-sit. ”
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”3. Explain the biochemical reasoning behind muscle fatigue. ”
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Lab 7 The Muscular System
BIO201L
Experiment 6: The Virtual Model – The Muscular System (Upper Body)
Post-Lab Questions
”1. What is the scientific term for the muscles of the mouth? ”
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”2. Are the muscles used in deep mastication located on the ventral or dorsal side of the body?”
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”3. Do the m. pectoralis muscles belong to the deep thorax group or the superficial thorax
group? ”
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”4. Is the m. rectus abdominis or the m. obliques externus more deep within the body? ”
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”5. Is the m. trapezius located in the abdomen, back, head, neck or thorax? ”
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”6. Which muscle lies directly posterior to the m. serratus posterior inferior right and left
muscle groups? ”
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Experiment 7: The Virtual Model – The Muscular System (Lower Body)
Post-Lab Questions
”1. Is the extensor digitorum longus or the extensor digitorum brevis more superficial to the
skin? ”
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”2. How many adductor muscles exist within the body? List them here. ”
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”3. Are the plantar muscles located in the foot, hip, leg, or thigh muscle group? ”
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”4. Does the lateral group of muscles extend towards the hallus or the fifth toe? ”
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”5. Which foot muscle group is most distal; the lateral group, the medial group, or the middle
group? ”
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Experiment 8: Virtual Model – Muscular System Coloring Activity
”Upload images for each exercise below: ”
”Abdomen: ”
Lab 7 The Muscular System
”Back: ”
BIO201L
Lab 7 The Muscular System
”Head: ”
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Lab 7 The Muscular System
”Upper Limb: ”
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Lab 7 The Muscular System
”Lower Limbs (Posterior): ”
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Lab 7 The Muscular System
”Lower Limbs (Anterior): ”
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Lab 7 The Muscular System
”Lower Limbs (Anterior – Distal): ”
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Lab 7 The Muscular System
BIO201L
Lab 7 The Muscular System
BIO201L
Experiment 9: Fetal Pig Dissection – Muscular System
Table 4: Experimental Data
Muscle
Origin
Insertion
Movement
Pectoralis major
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Latissimus dorsi
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Deltoids
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Rectus abdominus Click here to enter text.
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Transverse
abdominis
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Gluteus medius
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Post-Lab Questions
”1. Describe the tissue that covers muscles. ”
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”2. How many layers of abdominal muscle are there? ”
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”3. What direction do the muscle fibers of the external oblique run? ”
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”4. Why are muscle fibers considered excitable? ”
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”5. Why is it important to have both flexors and extensors? ”
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”6. How can muscle mass be influenced by training or age? ”
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Lab 7 The Muscular System
BIO201L
”Insert image of pig with skin removed with your name clearly visible in the background: ”

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