HBS 1.2.1, 1.2.2, and 1.2.5

What are the three types of muscle tissue?

Skeletal muscle, smooth muscle, and cardiac muscle.

What is the primary function of skeletal muscle?

To facilitate voluntary movements of the body.

What role does acetylcholine play in muscle contraction?

Acetylcholine is released at the neuromuscular junction to stimulate muscle contraction.

What are Type I muscle fibers known for?

Slow-twitch fibers that are fatigue-resistant and suited for endurance activities.

What is the sliding filament model?

A theory explaining muscle contraction involving the interaction of myosin and actin filaments.

What is the importance of ATP in muscle contraction?

ATP provides the energy needed for myosin heads to detach from actin after a power stroke.

How do calcium ions contribute to muscle contraction?

Calcium ions bind to troponin, causing a change that allows contraction by exposing myosin binding sites on actin.

What is the difference between flexors and extensors?

Flexors decrease the angle between body parts, while extensors increase the angle.

What are the characteristics of synovial joints?

Synovial joints have a joint cavity, synovial fluid, and allow for various movements.

What is a strain?

An injury to a muscle or tendon caused by overstretching or excessive force.

What is an example of a ball-and-socket joint?

The shoulder joint.

Name a nutritional factor that affects muscle function.

Sodium is essential for muscle contraction and relaxation.

What is the origin and insertion of a muscle?

The origin is the stationary attachment point, while the insertion is the moving attachment point.