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22 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are the four major functional characteristics of muscle tissue? |
Contractility Excitability Extensibility Elasticity |
CEEE |
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What are the three types of muscle tissue? |
Skeletal, Smooth, Cardiac |
SSC |
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In terms of their nuclei, skeletal muscle fibers are different than most cells in two ways. What are those ways? |
1. Multinucleated 2.Nuclei on the edges of the cell |
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When a muscle fiber contracts, what happens to the distance between the Z disks? |
Decreases |
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When a muscle fiber contracts, what happens to the length of the A band? |
Remains the same |
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When a muscle fiber contracts, what happens to the length of the I band? |
Decreases |
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When a muscle fiber contracts, what happens to the length of the H Zone? |
Decreases |
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When a muscle fiber contracts, what happens to the length of the myosin myofilament? |
Remains the same |
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When a muscle fiber contracts, what happens to the length of the actin myofilament? |
Remains the same |
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The concentration of calcium ions in the sarcoplasmic reticulum is decreasing. Is the muscle fiber starting to contract or has it finished contracting? |
Starting to contract |
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The myosin heads of a sarcomere have just received a boost of energy. Is the power stroke or the return stroke about to happen? |
Return stroke |
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a myosin head has ADP attached to it but not an individual phosphate. Which is going to happen next: the return stroke or power stroke? |
Power stroke |
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If you could look at several muscle fibers while they are in action, how could you determine which cells are a part of the same motor unit? |
They contract at the same time. |
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What is the function of acetylcholinesterase? If it were not for acetylcholinesterase, what would happen to a muscle? |
acetylcholinesterase inactivates ACh after it has interacted with the postsynaptic membrane if it were not for this enzyme, the muscle cell could never relax once it started contracting |
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There are two major roles that ATP plays in muscle contraction and relaxation. The first involves the sarcoplasmic reticulum, while the second involves the myosin head. what are those two roles? |
ATP provides the sarcoplasmic reticulum with energy for the active transport of calcium ions into itself. ATP attaches to the myosin heads, making them release the active sites and giving them energy for the return stroke. |
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A muscle is stiff. It can neither contract nor relax. what is wrong in the sarcomere? What causes this? |
The myosin heads must be gripping the active sites and not letting go. This must be due to a lack of ATP in the sarcomere |
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When a muscle fibers relaxes, does it automatically extend back to its resting size? |
No |
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All motor units has just been recruited. What has just happened to its motor neuron |
Sending action potentials down its axon |
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All of the motor units in a muscle have been recruited. If more stimulus is applied, what is that called? |
A supramaximal stimulus |
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A muscle is expending energy faster than it can be replaced by aerobic respiration. There is also no creatine phosphate left. What can the cell do? |
The only option left is anaerobic respiration |
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What will build up in the cell if anaerobic respiration is done? |
Lactic acid |
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When we breathe hard after we are finished exercising, what two things is the increased oxygen supply doing for the muscle fibers? |
(1) lactic acid is made into glucose (2) remake of creatine phosphate |
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