Term
| What the 3 Primary Types of Muscle Tissue? |
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Definition
Skeletal muscle
Cardiac muscle
Smooth muscle |
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Term
| What are the functions of skeletal Muscles? |
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Definition
-produce skeletal movement
-maintain body position
-support soft tissues
-guard openings
-maintain body temperature
-store nutrient reserves |
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Term
| What is the outer most covering of a muscle? |
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Definition
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Term
| What is the second layer of the skeletal muscle ? |
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Definition
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Term
| What is another name for muscle fiber? |
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Definition
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Term
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Definition
| The bundle of cells that are within the perimysium of the skeletal muscle |
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Term
| Muscle fibers develop through the fusion of mesodermal cells called ________? |
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Definition
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Term
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Definition
-the contractile unites of muscle
- structural units of myofibrils
-form visible patterns within myofibrils |
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Term
| The H Band is made of only thick or thin lines? |
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Definition
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Term
| What Lines make of the A Band of a sarcomere? |
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Definition
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Term
| Where is the start and stop of a sarcomere? |
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Definition
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Term
| The M line is located where in a sarcomere? |
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Definition
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Term
| What are the thin line made of up? |
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Definition
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Term
| What are the thick lines made of up of? |
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Definition
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Term
| What are the green lines within a sarcomere? |
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Definition
| Proteins anchoring the thick lines (myocin) to the z-line |
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Term
| The Myofibril is surrounded by what? |
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Definition
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Term
| Within a thin filament what are the pearl like molecules that are strung together? |
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Definition
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Term
| What does the tropomyosin guard? |
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Definition
| The active site of the g-actin molecule |
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Term
| The troponin are bound to the what? |
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Definition
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Term
| When troponin binds with calcium what happens? |
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Definition
| The tropomyosin is moved out of the way and the active site is exposed |
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Term
| Action Potential is generated by an increase in what? |
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Definition
| an increase in sodium ions in the sarcolemma |
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Term
| The Action potential travels along the what and leads to what? |
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Definition
T-tubules
leads to excitation-contraction coupling |
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Term
| What is required for Excitation-contraction coupling: |
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Definition
-action potential reaches a triad:
>> releasing Ca 2+
>> triggering contraction
-requires myosin heads to be in "cocked" position:
>> loaded by ATP energy |
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Term
| What are the 5 steps of the contraction cycle: |
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Definition
1. exposure of active sites
2. Formation of cross-bridges
3. Pivoting of myosin heads
4. detachment of cross-bridges
5. reactivation of myosin |
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Term
| The Tension of a single muscle fiber depends on what 3 things? |
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Definition
1. the # of pivoting cross-bridges
2. the fibers resting length at the time of stimulation
3. the frequency of stimulation |
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