Muscles & Muscle Contraction

Front

What type of muscle is found attached to bones throughout the body?

Back

Skeletal muscle.

Front

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

Back

It stores calcium ions and releases them during muscle contraction.

Front

Smooth muscle and cardiac muscle are considered what type of muscles?

Back

Involuntary muscles.

Front

List the components of a muscle from largest to smallest.

Back

Muscle, muscle fascicle, muscle cell, myofibril, filaments.

Front

Which type of muscle is found in the heart?

Back

Cardiac muscle.

Front

What is the primary function of skeletal muscle?

Back

To facilitate movement by contracting and pulling on bones.

Front

What is the role of myofibrils in muscle contraction?

Back

Myofibrils contain the contractile units (sarcomeres) that shorten during contraction.

Front

What is the difference between voluntary and involuntary muscles?

Back

Voluntary muscles are controlled consciously (e.g., skeletal muscles), while involuntary muscles are not (e.g., smooth and cardiac muscles).

Front

What is the structure that surrounds each muscle fiber?

Back

The sarcolemma.

Front

What are filaments in muscle cells?

Back

Filaments are the proteins (actin and myosin) that interact to produce muscle contraction.