Term
| three types of muscle tissue |
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Definition
1) skeletal
2) cardiac
3) smooth |
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Term
| description of skeletal muscle tissue |
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Definition
| attached to mainly bones, striated, voluntary |
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Term
| cells of skeletal muscle tissue |
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Definition
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Term
| description of cardiac muscle tissue |
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Definition
| found in heart, striated, involuntary |
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Term
| cells of cardiac muscle tissue |
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Definition
| shorter in length than skeletal muscle fibers and are branched; contain many gap junctions |
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Term
| description of smooth muscle tissue |
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Definition
| located in the walls of hallow organs and in skin, nonstriated, involuntary |
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Term
| 3 functions of muscle tissue |
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Definition
1) movement
2) support
3) generates heat |
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Term
| how does skeletal muscle tissue function in movement? |
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Definition
| walking, running, venous return |
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Term
| how does cardiac muscle tissue function in movement? |
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Definition
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Term
| how does smooth muscle tissue function in movement? |
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Definition
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Term
| how do muscle tissue function in support? |
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Definition
| helps with posture and strengthens abdominal wall and joints |
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Term
| how do muscle tissue function in generating heat? |
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Definition
| heat is generated during the process of muscle contraction (shivering) |
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Term
| 3 layers of connective tissue associated with skeletal muscles |
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Definition
1) epimysium
2) perimysium
3) endomysium |
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Term
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Definition
| layer of connective tissue that surrounds the entire external surface of a muscle |
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Term
| description of perimysium |
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Definition
| connective tissue that surrounds each fascicle |
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Term
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Definition
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Term
| description of endomysium |
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Definition
| layer of connective tissue that surrounds each muscle fiber |
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Term
| the three layers of connective tissue help form |
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Definition
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Term
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Definition
| also known as skeletal muscle cells |
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Term
| unique structure of muscle fibers |
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Definition
1) highly specialized plasma membrane
2) highly specialized sarcoplasm |
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Term
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Definition
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Term
| the sarcoplasm contains high amounts of |
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Definition
1) glycogen (storage form of glucose)
2) myoglobin (red pigment that stores O2 in muscle cells) |
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Term
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Definition
| microscopic rod-like structures in the sarcoplasm |
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Term
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Definition
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Term
| two types of myofilaments |
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Definition
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Term
| description of thick myofilaments |
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Definition
| composed of the protein myosin; each myosin protein has one tail and two heads |
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Term
| description of thin filaments |
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Definition
| composed of proteins actin, tropomyosin, and troponin |
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Term
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Definition
| each actin molecule contains a myosin binding site |
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Term
| description of cross bridges |
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Definition
| formed during muscle contraction when myosin heads bind to myosin binding sites |
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Term
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Definition
| string like protein; covers the myosin binding sites on actin when a muscle cell is at rest |
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Term
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Definition
| divided into three parts; binds to actin, tropomyosin, and calcium |
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Term
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Definition
| sectioned regions of myofibrils; extends from one Z disk to another Z disk |
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Term
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Definition
1) A band
2) I band
3) H zone
4) M line |
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Term
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Definition
| contains both thick and thin myofilaments |
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Term
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Definition
| contains only thin myofilaments; bisected by Z disk |
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Term
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Definition
| contains only thick myofilaments |
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Term
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Definition
| middle of H zone; contains proteins that connect thick myofilaments |
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Term
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Definition
| smooth endoplasmic reticulum of a skeletal muscle cell |
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Term
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Definition
| dilated ends of the sarcoplasmic reticulum; located on both sides of a T tubule |
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Term
| transverse tubule (T tubule) |
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Definition
| infoldings of the sarcolemma |
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Term
| function of sarcoplasmic reticulum |
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Definition
| stores Calcium (plays a critical role in muscle contraction) |
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Term
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Definition
| specialized synapse between a motor neuron and the sarcolemma of a muscle cell |
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