Support Us

If you found our community helpful, your small donation will help us reach more students around the globe. You may also like us on Facebook or follow us on Twitter.
New Topic  
wrote...
Posts:
7
Credits:
62
Rep:
2 0
3 years ago
PhysioEx 9.0 exercise 2, activity 6.

1. Explain what happens in the skeletal muscle sarcomere to result in the changes in active, passive, and total force when the resting muscle length is changed.

2. Explain the dip in the total force curve as the muscle was stretched to longer lengths.
  • Read 92078 times
  • 6 Replies
solved
wrote...
Posts: 2
Credits: 60
Rep:
5 0
3 years ago
To view this post & more...
You'll need to login or register
1. Changes in the resting length of the sarcomere directly affect the amount of passive, active and total force that results as described by the length-tension relationship.

2. The dip in the total force curve is due to the fact that at a very short muscle length, there is too much overlap to generate a significant amount of active force. Additionally, there is no passive force at this muscle length.

Here are the answers to PhysioEx 9.0 Exercise 2: Skeletal Muscle Physiology.

This is just a guide to help you out with your lab. I got 100% on it. Hope this helps Grin
wrote...
Posts: 2
Credits: 60
Rep:
0 0
3 years ago
thank you soooo much! i find these exercises to be incredibly tedious and truly appreciate your help! Grin
wrote...
Posts: 1
Credits: 51
Rep:
0 0
3 years ago
I agree. Activity two is the hardest this far. I have

1.   The latent period of the skeletal muscle that was tested in this lab simulation was
a.   about 1 second.
b.   less than 1 msec.               
c.   between 2-3 msec.
d.   variable, depending on the voltage that was applied to it.   c. between 2-3 msec
2.   True or False:  Another name for a muscle cell is “myofibril.”      false
3.   The largest active force that could be generated in the muscle is Activity 1 was _______ grams.   .8
4.   Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, and latent period.   Skeletal muscle fiber: The process whose specific outcome is the progression of the skeletal muscle fiber over time, from its formation to the mature structure. Muscle fibers are formed by the maturation of myotubes. They can be classed as slow, intermediate/fast or fast.
Motor unit: A motor neuron and all the skeletal muscle fibers it innervates (stimulates)
Skeletal Muscle twitch: A brief contraction of all the muscle fibers in a motor unit in response to a single action potential in its motor neuron
Electrical stimulus: Electrical stimulation uses an electrical current to cause a single muscle or a group of muscles to contract.
Period Latent : Lasts about 2 milliseconds (msec) and is the time between stimulation of muscle cells and force generation.


Post Merge: 3 years ago
c. between 2-3 msec
false
.8
Skeletal muscle fiber: The process whose specific outcome is the progression of the skeletal muscle fiber over time, from its formation to the mature structure. Muscle fibers are formed by the maturation of myotubes. They can be classed as slow, intermediate/fast or fast.
Motor unit: A motor neuron and all the skeletal muscle fibers it innervates (stimulates)
Skeletal Muscle twitch: A brief contraction of all the muscle fibers in a motor unit in response to a single action potential in its motor neuron
Electrical stimulus: Electrical stimulation uses an electrical current to cause a single muscle or a group of muscles to contract.
Period Latent : Lasts about 2 milliseconds (msec) and is the time between stimulation of muscle cells and force generation.
wrote...
Posts: 1
Credits: 51
Rep:
0 0
3 years ago
Motor unit is A motor neuron and all the skeletal muscle fibers it innervates (stimulates)
wrote...
Posts: 1
Credits: 51
Rep:
0 0
3 years ago
Great info! Explained well in relation to Physiological actions.
wrote...
Posts: 1
Credits: 44
Rep:
0 0
A year ago
Is this correct?
2. What is the role of acetylcholine in a skeletal muscle contraction? Answer: Acetylcholine diffuses onto the muscle fiber's plasma membrane (sarcolemma) and binds to receptors in the motor end plate initiating a change in ion permeability that results in a graded depolarization of the muscle plasma membrane (the end plate potential).
New Topic      
This topic is currently locked from adding new posts. Only administrators and moderators can reply. If you'd like to contribute to this topic, start a new thread and make reference to this one. Otherwise, contact a moderator for more options.

Control Panel

Click to ask a question. 396 Students and 36 members are standing by to answer all your science and biology homework problems, free. So far today, 253 guests have joined.
Dictionary
Search Images
Related Images
Views
200
Rating

Views
307
Rating

Views
465
Rating