Term
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Definition
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Term
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Definition
| muscle belly→fasciles→fibers→myofibrils→saromere→myosin |
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Term
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Definition
| where the muscle attaches to the inmovable bone. |
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Term
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Definition
| where the musle attaches to the movable bone. |
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Term
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Definition
- refers to a motor nerve and all the the muscle fibers that it innervates.
- all the same type of fiber |
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Term
| Large Units / Small Units |
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Definition
large units: quads, hams (large movements)
small units: eye muscles (fine movements) |
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Term
| The "All or None" Law of Muscle Contractions |
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Definition
| when a motor unit is stimulated, it "fires" at 100% of its potential, or it does not fire at all. |
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Term
| Proteins in Muscle Contraction |
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Definition
1. Actin
2. Myosin
3. Troponin
4. Tropomyosin |
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Term
| "Sliding-Filament Theory" |
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Definition
- Actin sliding over myosin
Step 1. Action potential - electrical signal from brain that starts whole process
Step 2. Calcium releases from S.R.
Step 3. Crossbridges attach
Step 4. Muscle fiber contracts
Step 5. Muscle tension increases |
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Term
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Definition
- highly aerobic
- highly resistant to fatigue
- efficiency
- slower speed of shortening
- less ability to produce force
- high capillary density
Examples: long-distance runners, swimming, cycling |
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Term
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Definition
- highly anaerobic
- low resistance to fatigue
- low efficiency
- highest speed of shortening
- high ability to produce force
- low capillary density
Examples: sprinters, jumpers, power-lifters |
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Term
| What classifies a muscle fiber? |
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Definition
- mitochondrial density (# of mitochondria)
- resistance to fatigue
- predominant enery system
- ATPase isoform - more in fast twitch
- speed of contraction
- efficiency
- capillary density - more in slow
- myoglobin content (O2 availability)
easier to change from fast twitch fibers to slow twitch. |
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Term
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Definition
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Term
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Definition
| allows for greater force generation due to the number of cross-bridges that can attach. |
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Term
Power Equation
Work Equation |
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Definition
Power= Work/Force Work=Force/Distance
^combo of force and speed |
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Term
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Definition
-sensory into about muscle length
-responds to stretch
-responsible for stretch reflex. |
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Term
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Definition
-Sensory info about about muscle tension
-found in tendon |
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Term
True of False?
Type 2b fibers are efficient. |
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Definition
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Term
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Definition
| encompasses the mechanical, physical and biochemical processes occuring in the human body |
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Term
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Definition
internal responses required to maintain stability of normal biological functions.
-appetite
-digestion
-eating behavior
-hormal signals -(gnrellin=hunger hormone) |
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Term
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Definition
| responses due to interaction with the environment |
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Term
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Definition
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Term
Dietary Supplement Health + Education Act of 1994
(DSHEA) |
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Definition
| puts the burden of proof for the effectiveness and safety of supplements on the FDA rather than on the supplement manufacturer. |
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Term
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Definition
-designed to prevent the competition from stealing formula
-but used to hide the fact the formula contains very little of the active ingredients listed on the bottle in an attempt to fool consumers
(must put ingredients on bottle, but you dont have to say how much) |
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