Muscle Contraction
Flashcard
•
Science
•
6th - 8th Grade
•
Hard
Barbara White
FREE Resource
Student preview
20 questions
Show all answers
1.
FLASHCARD QUESTION
Front
Sarcomere Noun
[sar-koh-meer]
Back
Sarcomere
The basic contractile unit of a muscle fiber, defined as the segment between two neighboring Z-discs in a myofibril.
Example: This diagram shows a sarcomere, the basic unit of a muscle, which is made of thick and thin protein filaments that cause muscle contraction.
2.
FLASHCARD QUESTION
Front
Sarcolemma Noun
[sar-koh-lem-uh]
Back
Sarcolemma
The specialized cell membrane that encloses a striated muscle fiber, which receives and conducts stimuli for muscle contraction.
Example: This diagram shows a muscle fiber, where the sarcolemma is the outer membrane that encloses the internal parts like myofibrils and sarcoplasm.
3.
FLASHCARD QUESTION
Front
Sarcoplasm Noun
[sar-koh-plaz-um]
Back
Sarcoplasm
The specialized cytoplasm of a muscle fiber, containing myofibrils, mitochondria, and other organelles necessary for muscle function.
Example: This diagram shows a muscle fiber is filled with a substance called sarcoplasm, which is the jelly-like cytoplasm of the muscle cell.
4.
FLASHCARD QUESTION
Front
Myofibril Noun
[my-oh-fy-bril]
Back
Myofibril
A long, cylindrical organelle found within muscle cells that is composed of actin and myosin filaments and performs contraction.
Example: This diagram shows a muscle fiber is a bundle of smaller rods called myofibrils, which are the parts that actually contract.
5.
FLASHCARD QUESTION
Front
Sarcoplasmic Reticulum Noun
[sar-koh-plaz-mik reh-tik-yuh-lum]
Back
Sarcoplasmic Reticulum
A specialized network of membranes in muscle cells that stores and releases calcium ions to trigger muscle contraction.
Example: This diagram shows the sarcoplasmic reticulum, a network of tubes that wraps around muscle fibers, storing and releasing the calcium needed for muscle contraction.
6.
FLASHCARD QUESTION
Front
Actin Noun
[ak-tin]
Back
Actin
A protein that forms the thin filaments in muscle fibers, providing the binding sites for myosin heads during contraction.
Example: This diagram shows an actin filament, a key protein structure in muscle cells, composed of smaller units and having distinct 'plus' and 'minus' ends.
7.
FLASHCARD QUESTION
Front
Myosin Noun
[my-uh-sin]
Back
Myosin
A motor protein that forms the thick filaments in muscle fibers, featuring heads that bind to actin to generate force.
Example: This diagram shows a myosin molecule, with its distinct 'head' and 'tail' regions, which is a key protein for muscle contraction.
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