APA Muscular System Structure and Physiology of Contraction 2023

Front

What is the H zone of a sarcomere?

Back

The center of the A band where only thick myofilaments are found.

Front

From smallest to largest, what is the correct order of muscle components?

Back

Myofilaments, Sarcomere, Myofibril, Muscle Fiber, Fascicle, Muscle.

Front

What is the M line in a sarcomere?

Back

The center of the A band where the attachment site for thick (myosin) myofilaments is located.

Front

What is a fascicle in muscle anatomy?

Back

A group of muscle fibers wrapped in perimysium.

Front

What is the sarcolemma?

Back

The cell/plasma membrane of a muscle fiber.

Front

What are myofilaments?

Back

The filaments of myofibrils, constructed from proteins, primarily actin and myosin.

Front

What is a sarcomere?

Back

The basic unit of a muscle's striated muscle tissue, defined as the segment between two Z lines.

Front

What role does the sarcoplasmic reticulum play in muscle contraction?

Back

It stores calcium ions and releases them during muscle contraction.

Front

What is the function of myofibrils?

Back

They are the contractile threads found in striated muscle cells, responsible for muscle contraction.

Front

What is the difference between thick and thin myofilaments?

Back

Thick myofilaments are primarily made of myosin, while thin myofilaments are primarily made of actin.