Assign each characteristic to the appropriate type of muscle. Skeletal Muscle Smooth Muscle Both Ca2+ promotes contraction May be autorhythmic Contains myofibrils Dense bodies Striated Carbon dioxide levels in blood promote contraction Contains T tubules Contain thin filaments of actin Multinucleate
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Step 1: Identify the characteristics of skeletal muscle: - Contains myofibrils - Striated - Contains T tubules - Multinucleate Show more…
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Assign each characteristic to the appropriate type of muscle. Ca²⁺ involved in contraction Involuntary Cells are multinucleate May be autorhythmic Striated Cells may be connected by gap junctions Contains T-tubules Contain thin filaments of actin Contains myofibrils Voluntary Skeletal Muscle Smooth Muscle Both Skeletal and Smooth Muscle
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1. Identify components in the structure of a skeletal muscle fiber. 2. What is responsible for the striations observed in microscopic sections of skeletal muscle? 3. Describe the types of myofilaments found in muscle cells 4. Describe the function of: - Sarcoplasmic reticulum - Transverse tubules
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Place the following events of muscle contraction in the correct sequence: i. Sarcoplasmic reticulum releases calcium ions ii. Z lines slide closer together iii. A postsynaptic muscle cell is depolarized, triggering an action potential iv. Calcium concentrations decrease, and tropomyosin-troponin complex reforms over the myosin binding sites
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