Sliding Filament Model
Flashcard
•
Biology
•
12th Grade
•
Practice Problem
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the sliding filament model?
Back
The sliding filament model explains how muscles contract by the sliding of actin and myosin filaments past each other, leading to shortening of the sarcomere.
2.
FLASHCARD QUESTION
Front
What is a sarcomere?
Back
A sarcomere is the basic structural and functional unit of a muscle fiber, defined as the segment between two Z lines.
3.
FLASHCARD QUESTION
Front
What happens to the sarcomere during muscle contraction?
Back
During muscle contraction, the sarcomere shortens as the actin filaments slide over the myosin filaments.
4.
FLASHCARD QUESTION
Front
What is the role of calcium ions in muscle contraction?
Back
Calcium ions bind to troponin, causing a conformational change that allows myosin to bind to actin, initiating contraction.
5.
FLASHCARD QUESTION
Front
What is the function of ATP in muscle contraction?
Back
ATP provides the energy required for the power stroke of the myosin cross bridge, allowing muscle contraction to occur.
6.
FLASHCARD QUESTION
Front
What is the sarcoplasmic reticulum?
Back
The sarcoplasmic reticulum is a specialized endoplasmic reticulum in muscle cells that stores and releases calcium ions.
7.
FLASHCARD QUESTION
Front
What is the sarcolemma?
Back
The sarcolemma is the plasma membrane of a skeletal muscle cell, which surrounds the muscle fiber.
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