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Muscle Cells and Myofibrils Quiz

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Questions and Answers

What is the primary function of myofibrils within skeletal muscle cells?

To provide structural support to the cell

To serve as the contractile machinery of the muscle (correct)

To transport oxygen throughout the muscle tissue

To store energy in the form of glycogen

Which components primarily compose myofibrils?

Thick filaments and thin filaments (correct)

Nuclei and mitochondria

Ribosomes and golgi apparatuses

Smooth and cardiac muscle fibers

What percentage of the sarcoplasm volume is occupied by myofibrils?

80% (correct)

90%

50%

30%

Which type of muscle tissue does NOT utilize myofibrils for contraction?

<p>Smooth muscle</p> Signup and view all the answers

What is the approximate diameter of myofibrils?

<p>1 um</p> Signup and view all the answers

Study Notes

Myofibrils

Myofibrils are rod-like structures found in the sarcoplasm of skeletal and cardiac muscle cells.
They are bundled in parallel and run the entire length of the cell.
They represent the contractile machinery of skeletal and cardiac muscle.
They are primarily composed of thick filaments and thin filaments.

Sarcoplasm

The sarcoplasm is the cytoplasm of muscle cells.
It contains many organelles found in other cells, including nuclei, Golgi apparatuses, ribosomes, and mitochondria.
Approximately 80% of the sarcoplasm is devoted to myofibrils.

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Description

Test your knowledge about myofibrils and sarcoplasm, key components of skeletal and cardiac muscle cells. This quiz covers their structure, function, and composition. Enhance your understanding of muscle physiology and its cellular components.