Understanding Muscle Tissue and Physiology

Front

What is a motor unit?

Back

A motor unit consists of a single neuron and all of the muscle fibers it innervates.

Front

What is the function of the epimysium in skeletal muscle?

Back

The epimysium surrounds the entire muscle.

Front

What color are Type I muscle fibers?

Back

Type I fibers are red.

Front

What is the structural unit of a myofibril?

Back

The structural unit of a myofibril is the sarcomere, which consists of thin and thick filaments.

Front

What is the role of myosin heads during muscle contraction?

Back

Myosin heads interact with actin filaments during muscle contraction.

Front

What are the two main types of muscle tissue?

Back

The two main types of muscle tissue are skeletal muscle and smooth muscle.

Front

What is the primary function of skeletal muscle?

Back

The primary function of skeletal muscle is to facilitate movement of the skeleton.

Front

What is the difference between fast-twitch and slow-twitch muscle fibers?

Back

Fast-twitch fibers are designed for quick bursts of power, while slow-twitch fibers are more efficient for endurance activities.

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 myosin to interact with actin.

Front

What is the function of the sarcoplasmic reticulum?

Back

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