Anatomy & Phys - Muscular System Test Review

Front

What is actin?

Back

Thin myofilament, has binding sites for myosin to bind to during contractions.

Front

What is elasticity in muscles?

Back

The ability of muscle tissue to recoil after being stretched.

Front

Identify the muscle known as the 'calf muscle'.

Back

Gastrocnemius.

Front

What characterizes a Grade III muscle strain?

Back

Complete tear of the muscle, severe pain, bruising, loss of function, requires surgery, and takes 6 months to a year to heal.

Front

Which muscle is located in the hip region and is important for hip abduction?

Back

Gluteus medius.

Front

What is the primary function of myosin in muscle contraction?

Back

Thick myofilament that has heads that pull to cause contractions.

Front

Define contractility in the context of muscle tissue.

Back

The ability of muscle fibers to shorten and generate force.

Front

What is the role of calcium ions in muscle contraction?

Back

Calcium ions bind to troponin, causing a conformational change that allows myosin to bind to actin.

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 sliding filament theory?

Back

A theory that explains muscle contraction as the sliding of actin filaments over myosin filaments, shortening the muscle fiber.