Muscle Contraction

Muscle Contraction

Assessment

Flashcard

•

Science

•

6th - 8th Grade

•

Hard

Created by

Barbara White

FREE Resource

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20 questions

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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.
Media Image

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.
Media Image

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.
Media Image

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.
Media Image

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.
Media Image

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.
Media Image

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.
Media Image

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