Muscles & Muscle Contraction

Front

Found attached to bones throughout the body

Back

Skeletal muscles are the type of muscles that are attached to bones and are responsible for voluntary movements.

Front

Skeletal muscles always work _____

Back

in pairs. Skeletal muscles work in pairs to facilitate movement; when one muscle contracts, the other relaxes.

Front

____________ attaches to actin to form the cross bridge.

Back

Myosin is the protein that attaches to actin filaments to form cross bridges during muscle contraction.

Front

Found in the heart

Back

Cardiac muscles are specialized muscles found only in the heart, responsible for pumping blood.

Front

A ______________________ attach bones to each other at joints.

Back

Ligament is a fibrous connective tissue that connects bones to other bones at joints.

Front

What type of muscle is involuntary and found in the walls of organs?

Back

Smooth muscle is involuntary and found in the walls of hollow organs, such as the intestines and blood vessels.

Front

What is the role of calcium in muscle contraction?

Back

Calcium ions are essential for muscle contraction as they bind to troponin, causing a conformational change that allows myosin to bind to actin.

Front

What is the basic functional unit of a muscle called?

Back

The sarcomere is the basic functional unit of a muscle, responsible for 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., cardiac and smooth muscles).

Front

What is the primary energy source for muscle contraction?

Back

Adenosine triphosphate (ATP) is the primary energy source for muscle contraction.