Muscular System

Front

What is the primary function of skeletal muscles?

Back

Skeletal muscles are responsible for voluntary movements of the body and require energy to contract and relax.

Front

What type of muscle cells are striated, voluntary, and have multiple nuclei?

Back

Skeletal muscle cells.

Front

What type of muscle cells are not striated, involuntary, and have one nucleus per cell?

Back

Smooth muscle cells.

Front

What happens during repolarization in muscle cells?

Back

Potassium ions move out of the cell.

Front

What is depolarization in muscle cells?

Back

Depolarization occurs when sodium ions move into the cell, making the inside of the cell more positive.

Front

What is the role of calcium ions in muscle contraction?

Back

Calcium ions are released from the sarcoplasmic reticulum and bind to troponin, allowing muscle contraction to occur.

Front

What is the difference between voluntary and involuntary muscles?

Back

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

Front

What is the structure that connects muscles to bones?

Back

Tendons.

Front

What is the role of the sarcoplasmic reticulum in muscle cells?

Back

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

Front

What is the basic unit of a muscle called?

Back

A muscle fiber.