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Myofibrils and Myofilaments

Myofibrils and Myofilaments

Assessment

Flashcard

Biology

11th - 12th Grade

Practice Problem

Hard

Created by

Wayground Content

FREE Resource

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15 questions

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1.

FLASHCARD QUESTION

Front

What are myofibrils?

Back

Myofibrils are long, thread-like structures found in muscle fibers, composed of repeating units called sarcomeres, which are responsible for muscle contraction.

2.

FLASHCARD QUESTION

Front

What are myofilaments?

Back

Myofilaments are the filaments of myofibrils, primarily composed of actin (thin filaments) and myosin (thick filaments), that interact to produce muscle contraction.

3.

FLASHCARD QUESTION

Front

What occurs during sarcomere shortening?

Back

During sarcomere shortening, the I band narrows, the H zone narrows, and the zone of overlap increases, while the A band remains the same length.

4.

FLASHCARD QUESTION

Front

What is the role of actin in muscle contraction?

Back

Actin provides the binding sites for myosin during muscle contraction, allowing the myosin heads to attach and pull the actin filaments.

5.

FLASHCARD QUESTION

Front

What is the role of myosin in muscle contraction?

Back

Myosin is a thick filament that interacts with actin to generate force and movement during muscle contraction.

6.

FLASHCARD QUESTION

Front

What is the function of troponin?

Back

Troponin is a regulatory protein that binds calcium ions and, when activated, causes tropomyosin to move away from actin's binding sites, allowing muscle contraction to occur.

7.

FLASHCARD QUESTION

Front

What is the function of tropomyosin?

Back

Tropomyosin is a protein that wraps around actin filaments and blocks myosin binding sites at rest, preventing muscle contraction.

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