What is the primary function of skeletal muscles?

• Generating heat

• Maintaining posture

• Producing movement

• Stabilizing joints

Which muscle is known as the 'kissing' muscle?

• Masseter

• Buccinator

• Orbicularis oris

• Zygomaticus

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

• Breaking down acetylcholine

• Generating ATP

• Storing calcium

• Producing myofibrils

Which muscle group is responsible for extending the knee?

• Gluteus maximus

• Hamstring group

• Quadriceps group

• Adductor muscles

What is the function of the neurotransmitter acetylcholine in muscle contraction?

• Releasing calcium

• Binding to actin

• Stimulating muscle cells

• Breaking down ATP

Which muscle is the prime mover for elbow extension?

• Biceps brachii

• Triceps brachii

• Brachialis

• Brachioradialis

What is the main action of the gluteus maximus muscle?

• Flexing the hip

• Adducting the thigh

• Abducting the thigh

• Extending the hip

Which of the following movements is a combination of flexion, extension, abduction, and adduction?

• Circumduction

• Rotation

• Supination

• Pronation

What is the primary role of the erector spinae muscles?

• Flexing the spine

• Rotating the spine

• Extending the spine

• Stabilizing the scapula

Which muscle is responsible for raising the corners of the mouth?

• Frontalis

• Orbicularis oculi

• Zygomaticus

• Platysma