Muscular System

Front

What is the epimysium?

Back

The epimysium is a connective tissue sheath that surrounds the entire muscle, providing structure and support.

Front

What must occur first to trigger skeletal muscle contraction?

Back

Acetylcholine (ACh) binds to receptors on the sarcolemma and allows passage of sodium ions into the cell.

Front

What is an action potential?

Back

An action potential is an unstoppable electrical current that travels down the length of the entire surface of a sarcolemma, leading to muscle contraction.

Front

What is the insertion point of a muscle?

Back

The insertion is the point of muscle attachment to a movable bone.

Front

What type of muscle tissue is skeletal muscle?

Back

Skeletal muscle is a type of voluntary muscle tissue that is striated and attached to bones.

Front

What is the role of acetylcholine in muscle contraction?

Back

Acetylcholine is a neurotransmitter that binds to receptors on the muscle cell membrane, initiating the process of muscle contraction.

Front

What is the function of the sodium-potassium pump in muscle cells?

Back

The sodium-potassium pump restores sodium and potassium ions to their initial positions after an action potential, maintaining the cell's resting potential.

Front

What is the difference between voluntary and involuntary muscle tissue?

Back

Voluntary muscle tissue, like skeletal muscle, is under conscious control, while involuntary muscle tissue, like smooth and cardiac muscle, operates without conscious control.

Front

What is the role of acetylcholinesterase (AchE)?

Back

Acetylcholinesterase (AchE) breaks down acetylcholine in the synaptic cleft, stopping the signal for muscle contraction.

Front

What are fixators in muscle anatomy?

Back

Fixators are muscles that stabilize the origin of the prime mover, allowing for more effective movement.