Asked by Jonah Sachnowitz on May 06, 2024
Verified
What is the correct order of events in muscle contraction?
A) action potential → synaptic cleft → sarcoplasmic reticulum → sarcolemma → calcium ions bind to troponin
B) action potential → synaptic cleft → sarcolemma → sarcoplasmic reticulum → calcium ions bind to troponin
C) action potential → sarcoplasmic reticulum → synaptic cleft → sarcolemma → calcium ions bind to troponin
D) action potential→ sarcolemma → sarcoplasmic reticulum → synaptic cleft → calcium ions bind to troponin
E) action potential → sarcolemma → synaptic cleft → sarcoplasmic reticulum → calcium ions bind to troponin
Muscle Contraction
The process where muscle fibers shorten or generate tension in response to nervous system signals, allowing movement of the body.
Action Potential
Electrochemical changes that take place across the axon membrane; the nerve impulse.
- Recognize the anatomical and molecular components that facilitate muscle contraction and the transformation of energy.
- Elucidate the mechanism and elements involved in the formation of neuromuscular junctions and the role of neurotransmitters in muscle contraction.
Verified Answer
AT
Aariyan TooleyMay 10, 2024
Final Answer :
B
Explanation :
The correct sequence for muscle contraction starts with an action potential reaching the muscle fiber, which then travels across the sarcolemma (muscle cell membrane) and down into the muscle through the T-tubules. This action potential triggers the sarcoplasmic reticulum to release calcium ions, which then bind to troponin, initiating the contraction process.
Learning Objectives
- Recognize the anatomical and molecular components that facilitate muscle contraction and the transformation of energy.
- Elucidate the mechanism and elements involved in the formation of neuromuscular junctions and the role of neurotransmitters in muscle contraction.
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