What is an action potential?
Anatomy Final Exam Review

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Science
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12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
An action potential is an electrical message that travels through neurons, allowing communication between nerve cells.
2.
FLASHCARD QUESTION
Front
What does the release of acetylcholine trigger in skeletal muscles?
Back
The release of acetylcholine triggers skeletal muscles to contract.
3.
FLASHCARD QUESTION
Front
What type of neurons carry action potentials from the brain to skeletal muscle fibers?
Back
Motor neurons carry action potentials from the brain to the skeletal muscle fibers, triggering them to contract.
4.
FLASHCARD QUESTION
Front
What happens in Step 8 of the Neuromuscular Junction?
Back
The sarcoplasmic reticulum is stimulated by the action potential and releases Ca2+.
5.
FLASHCARD QUESTION
Front
What is the role of tropomyosin in muscle contraction?
Back
Tropomyosin is a regulatory protein that is rod-like and runs the length of actin, helping to regulate muscle contraction.
6.
FLASHCARD QUESTION
Front
What is the function of neurotransmitters in the nervous system?
Back
Neurotransmitters are chemicals that transmit signals across a synapse from one neuron to another, facilitating communication in the nervous system.
7.
FLASHCARD QUESTION
Front
What is the role of calcium ions (Ca2+) in muscle contraction?
Back
Calcium ions (Ca2+) are released from the sarcoplasmic reticulum and bind to troponin, causing tropomyosin to move and expose binding sites on actin for myosin.
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