5 characteristics of muscle 1. Responsiveness 2. Conductivity 3. Contractibility 4. Extensibility 5. Elasticity
2 names for muscle fiber 1. myofiber 2. myocyte
Muscle cells are packed full of which type of protein filament? myofibrils: bundles of protein filaments (actin and myosin)
Difference b...
BIO-210 Exam 3 Questions and Verified Answers 5 characteristics of muscle ✅1. Responsiveness 2. Conductivity 3. Contractibility 4. Extensibility 5. Elasticity 2 names for muscle fiber ✅1. myofiber 2. myocyte Muscle cells are packed full of which type of protein filament? ✅myofibrils: bundles of protein filaments (actin and myosin) Difference between myofiber and myofibril ✅Myofiber: a muscle fiber Myofibril: protein filaments within the cytoplasm of the muscle cell Muscle cytoplasm (name and significance) ✅Sarcoplasm: contains glycogen and mitochondria to provide energy for contraction and myoglobin for binding oxygen Muscle cell membrane (name) ✅Sarcolemma T-tubules (location and function) ✅conducts action potential to open calcium channels on sarcoplasmic reticulum Sarcoplasmic reticulum (location and function) ✅stores calcium Terminal cisternae (location and function) ✅dilated end -sacs; store calcium What is a "triad" referring to? ✅a triad consists of 1 transverse tubule and 2 terminal cisternae 3 Connective tissue wrappings of skeletal muscle ✅1. Endomysium 2. Perimysium 3. Epimysium Endomysium ✅around single muscle fiber; can repair damage with satellite (stem) cells Perimysium ✅around a fascicle (bundle) of fibers Epimysium (connected to? separates?) ✅surrounds all the fascicles; connected to deep fascia; separates muscle from surrounding tissue What does the epimysium, perimysium, and endomysium make up when they come together? ✅Tendon or aponeurosis Aponeurosis (where can it be found?) ✅sheet -like structure; found in palmar and plantar regions Aponeurosis vs. Tendon ✅aponeurosis: sheet -like structure tendon: cord -like structure Contractile unit of muscle cell ✅Myofibril (actin and myosin) What protein is the thin filament? ✅action What protein is the thick filament? ✅myosin What is a cross bridge? ✅the heads of myosin filaments Titin protein (what two regions does it connect in the sarcomere?) ✅a molecular spring which is responsible for the passive electricity of muscle; connects the Z line to the M line Z line (sarcomere) ✅D I band (sarcomere) ✅C A band (sarcomere) ✅D H zone (sarcomere) ✅E M line (sarcomere) ✅gray arrow (thick line at ends of muscle cell) thin filament (sarcomere) ✅C thick filament (sarcomere) ✅B dark band (sarcomere) (also known as?) ✅A band light band (sarcomere) (also known as?) ✅I band
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