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26 Cards in this Set
- Front
- Back
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Muscle tissue |
Contraction; movement of body; change in shape and size internal organs. |
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How do muscle cell contract? |
Sliding movement between actin and myosin (contraction) What are |
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What are the muscle cells made up of? |
Myofilaments |
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Two types of myofilaments |
Thick filaments: composed of myosin II; one structure Thin filaments: composed of actin (G-actin and F-actin); troponin and tropomyosin; 3 structures |
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What are long cylindrical structures of muscle tissue called? |
Muscle fibers |
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Cell membrane |
Sarcolemma |
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Cytoplasm |
Sarcoplasm |
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Mitochondria |
Sarcosome |
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Endoplasmic Reticulum |
Sarcoplasmic reticulum |
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Front (Term) |
1) Epimysium: separates/enclose the fascicles |
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Front (Term) |
Perimysium: surround each fascicle or bundle |
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Front (Term) |
Endomysium: surrounds a single muscle fiber |
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Myoblast |
Fusion of individual muscle cells. |
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Characteristic of a muscle fiber |
Multinucleated syncytium |
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What is so special about satellite cells? |
Limited regeneration of muscle fiber. |
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What is an important feature of skeletal muscle? |
Striation and voluntary movement. |
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Front (Term) |
A-band: form myosin filaments and overlapping of myosin and actin filaments M-line: myosin filaments are attached I-band= where actin filaments are formed Z-disc: actin filaments are attached Sacromere: area between two z-disks |
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Front (Term) |
H-zone: myosin filaments only |
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What happens when muscles contract? |
Sacromere (z-line) shortens No change in actin or myosin H-zone and I-band shortens Myofilaments don’t change length |
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What is t-tubule and significance? |
Passage that allows deeper access to muscle fibers and causes depolarization. |
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What is a triad? |
A complex that includes T tubule and 2 terminal cisternae |
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Describe the depolarization event in skeletal muscle fibers |
Sarcoplasmic reticulum form terminal cisternae that serves as a reservoir for Calcium which is where muscle contraction come into play |
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What are types of skeletal muscle fibers? |
Type I (oxidative): slow contraction; a lot of myoglobin; red muscle; less chance of fatigue Type IIa (fast oxidative glycolytic): fast contraction; less myoglobin; white muscle; less chance of fatigue Type IIb (fast glycolytic): fast contraction; less myoglobin; white muscle; fatigue easily |
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Cardiac muscle |
Striated involuntary contraction; each cardiomyocyte are highly branched with its own nucleus; attached by intercalated discs |
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Smooth muscle |
No striation involuntary contraction; actin and myosin are present but not in form of striation; actin is attached to dense bodies (z-line) |
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Front (Term) |
A) Skeletal muscle B) Cardiac muscle C) Smooth muscle |
