Muscle Cell Contraction & Processes MCQ PDF
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Al-Noor University
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This document includes multiple-choice questions about muscle cell contraction and processes such as excitation-contraction coupling, neuromuscular junctions, and myocardial cell function.
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# Muscle Cell and Their Processes ## Muscle Cell Contraction 1. What is the process by which an electrical signal in a muscle cell causes the muscle cell to mechanically shorten? - **a) Excitation-contraction coupling** - b) Neuromuscular junction - c) Action potential - d) Muscle fiber contracti...
# Muscle Cell and Their Processes ## Muscle Cell Contraction 1. What is the process by which an electrical signal in a muscle cell causes the muscle cell to mechanically shorten? - **a) Excitation-contraction coupling** - b) Neuromuscular junction - c) Action potential - d) Muscle fiber contraction 2. What are the two linked phases that make up the **excitation-contraction coupling (ECC)** process? - a) Nerve impulse and muscle fiber contraction - **b) Excitation phase and contraction phase** - c) Neuromuscular junction and muscle fiber - d) Action potential and neuromuscular junction 3. What is the name given to the connection between a motor neuron and a muscle cell? - **a) Neuromuscular junction** - b) Muscle fiber - c) Excitation phase - d) Contraction phase ## Changes During Muscle Contraction 4. What physical change **occurs** to the muscle fiber when it contracts? - a) The muscle fiber becomes longer and more flexible. - **b) The muscle fiber becomes shorter and flexed** - c) The muscle fiber becomes thicker and more organized. - d) The muscle fiber remains unchanged in shape. ## Myocardial Cells 5. What is the resting potential of normal working myocardial cells? - a) ~70 mV - b) ~80 mV - **c) ~90 mV** - d) ~100 mV ## Cardiac Impulse 6. Which phase is central to the rapid propagation of the cardiac impulse? - **a) Phase 0** - b) Phase 1 - c) Phase 2 - d) Phase 3 7. Which phase sets the potential for the next phase of the action potential? - a) Phase 0 - **b) Phase 1** - c) Phase 2 - d) Phase 3 8. Which phase is the longest phase and marks the phase of calcium entry into the cell? - a) Phase 0 - b) Phase 1 - **c) Phase 2** - d) Phase 3 9. Which phase restores the membrane potential to its resting value? - a) Phase 0 - b) Phase 1 - c) Phase 2 - **d) Phase 3**
