Muscle tissue. Word Scramble
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| Question | Answer |
| what are three types of muscle tissue? | skeletal, smooth, and cardiac |
| skeletal muscle | voluntary with stripes, ex. bone |
| smooth muscle | involuntary without stripes, ex. walls of hallow organs |
| cardiac muscle | involuntary with stripes, ex. heart |
| what are the function of muscle tissue? | movement, maintenance of posture, joint stabilization, and heat generation |
| what are the three functional features? | contractility, excitability, extensibility, and elasticity |
| contractility | muscles cells shorten and generate pulling force |
| excitability | electrical nerve impulse stimulate the muscle cell to contract |
| elasticity | can recoil passively after being stretched, resume resting length |
| sarcolemma | plasma membrane |
| cytoplasm | sarcroplasm |
| what are the three connective tissue binds with skeletal muscles and its fiber together? | epimysium, perimysium, and endomysium |
| epimysium | dense regular connective tissue surrounding entire muscle |
| perimysium | surrounds each fascicle (groups of muscle fibers) |
| endomysium | a fine sheath of connective tissue wrapping each muscle fiber |
| each skeletal muscle supplied by branches of... | one nerve, one artery, and one or more veins |
| origin | less movable attachment |
| insertion | more movable attachment |
| fleshy attachments | connective tissue fibers are short |
| indirect attachments | connective tissue forms a tendon or aponeurosis (flat tendon) |
| sarcromeres | a long row of repeating segments, ex. Z disc (Z line), thin (actin) filaments, and thick (myosin) fliaments |
| Z disc (Z line) | boundaries of each sarcromere, where the cell membrane connect each other |
| thin (actin) filament | extend from Z disc toward the center of the sarcromere |
| thick (myosin) filament | located in the center of the sarcromere |
| A bands | full length of the thick filament, includes inner end of thin filament |
| H zone | center part of A band where no thin filament occur |
| M line | in center of H zone, contain tiny rod that hold thick filaments together |
| I band | region with only thin filament, lies within two adjacent sarcromeres |
| what are the three types of skeletal muscle fibers? | slow oxidative fibers (Type I), fast glycolytic fiber (Type IIx), and fast oxidative fibers (Type IIa) |
| slow oxidative fibers (Type I) | red color due to abundant mygobbin obtain energy from aerobic metabolic reactions contain a large number of mitochondria richly supplied with cappilaries contract slowly and resistant to fatigue fibers are smaller in diameter |
| fast glycolytic fiber (Type IIx) | contain little myoglobin and few mitochondria about twice the diameter of slow-oxidative fiber contain more myofilaments and generate more power depend on anaerobic pathways contract rapidly and tire quickly |
| fast oxidative fibers (Type IIa) | have a an intermediate diameter contract quickly like fast glycolytic fibers are oxygen-dependent have high myogglobin content and rich supply of capillaries somewhat fatigue-resistant more powerful than slow-oxidative fibers |
Created by:
adriana9
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