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Chapter 9
Muscle Tissue & Muscles
| Question | Answer |
|---|---|
| which muscle has intercerlated discs? | cardiac |
| where is cardiac muscle found? | the heart |
| which 2 muscles can contract w/o nervous system stimulation? | cardiac and smooth muscle |
| ___ and __ muscle is involuntary | cardiac and smooth |
| which 2 muscles are striated? | cardiac and skeletal |
| smooth muscle is found in: | walls of hollow organs (stomach, urinary bladder, etc) |
| ___ muscle is the only voluntary muscle | skeletal |
| skeletal muscles attach to: | bones or skin |
| muscle functions include: | produce heat, movement of bones/fluid, maintaining posture & stablizing joints |
| what are the 4 characteristics of muscle tissue? | excitability, contractility, extensibility and elasticity |
| excitability has the ability to: | receive & respond to stimuli |
| contractility has the ability to: | shorten forcibly when stimulated |
| extensibility has the ability to: | stretch |
| elasticity has the ability to: | recoil to resting length |
| skeletal muscles attach in what 2 places? | insertion and origin |
| insertion | movable bone |
| origin | immovable bone |
| muscles are covered by: | epimysium |
| fascicles are covered by: | perimysium |
| what is a fascicle? | a portion of the muscle |
| muscle fibers are covered by: | endomysium |
| sarcolemma is the __ of the muscle fiber | plasma membrane |
| sarcoplasm is the ___ of the muscle fiber | cytoplasm |
| what 2 structures of the muscle fiber help regulate muscle contraction? | T-tubules and sarcoplasmic reticulum |
| myofibrils are composed of : | myofilaments |
| what is a sarcomere? | a segment of a myofribil |
| what are the 2 types of myofilaments? | actin and myosin |
| actin are the __ molecules found in myofilaments | thin |
| myosin are the __ molecules found in myofilaments | thick |
Created by:
Mariahj25
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