What is a muscle cramp?
Muscle Unit Review

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Science
•
12th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A muscle cramp is an involuntary and forcibly contracted muscle that does not relax. It often occurs due to extracellular fluid imbalances.
2.
FLASHCARD QUESTION
Front
What does summation refer to in muscle physiology?
Back
Summation is the process by which multiple stimuli can combine to produce a stronger muscle contraction.
3.
FLASHCARD QUESTION
Front
What are myosin binding sites?
Back
Myosin binding sites are locations on the actin filament that become exposed when calcium ions bind to the actin complex, allowing muscle contraction to occur.
4.
FLASHCARD QUESTION
Front
What is the appearance of striated muscle?
Back
Striated muscle has a banded appearance due to the overlapping and non-overlapping filaments within the muscle fibers.
5.
FLASHCARD QUESTION
Front
What is the sarcoplasmic reticulum?
Back
The sarcoplasmic reticulum is a specialized type of smooth endoplasmic reticulum in muscle cells that stores calcium ions.
6.
FLASHCARD QUESTION
Front
What role does calcium play in muscle contraction?
Back
Calcium ions are essential for muscle contraction as they bind to troponin, causing a conformational change that exposes myosin binding sites on actin.
7.
FLASHCARD QUESTION
Front
What is the function of transverse tubules?
Back
Transverse tubules (T-tubules) are extensions of the muscle cell membrane that help transmit action potentials deep into the muscle fiber.
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