Muscular System Practice

Front

What are the three types of muscles?

Back

Skeletal muscles, smooth muscles, and cardiac muscles.

Front

What is the function of the sarcoplasmic reticulum?

Back

The sarcoplasmic reticulum stores calcium ions and releases them during muscle contraction.

Front

What attaches to actin to form the cross bridge?

Back

Myosin.

Front

Which proteins are primarily responsible for muscle contraction?

Back

Actin and myosin.

Front

What are the main functions of muscles?

Back

Movement, stability, and posture.

Front

What is the role of troponin in muscle contraction?

Back

Troponin binds to calcium ions and helps regulate muscle contraction.

Front

What is the difference between voluntary and involuntary muscles?

Back

Voluntary muscles are under conscious control (e.g., skeletal muscles), while involuntary muscles operate without conscious control (e.g., smooth and cardiac muscles).

Front

What is the structure that surrounds each muscle fiber?

Back

The sarcolemma.

Front

What is the function of myofibrils in muscle cells?

Back

Myofibrils are responsible for muscle contraction and are made up of repeating units called sarcomeres.

Front

What is the sliding filament theory?

Back

The sliding filament theory explains how muscles contract by the sliding of actin and myosin filaments past each other.