[ CH. 8 ] Control of Movement

What are the two types of movements described in the skeletal muscle anatomy?

• Rotation and Circumduction

• Flexion and Extension

• Abduction and Adduction

• Pronation and Supination

Which skeletal muscle movement describes moving one's limb toward the body?

• Rotation
• Flexion
• Extension

• Abduction

Which skeletal muscle movement describes moving one's away from the body?

• Rotation
• Flexion
• Extension

• Abduction

Which neurons serve the extrafusal muscle fibers?

• Beta motor neurons

• Gamma motor neurons

• Alpha motor neurons

• Delta motor neurons

What do sensory endings in intrafusal muscle fibers detect?

• The amount of oxygen in the muscle

• The length of the muscle

• The temperature of the muscle

• The strength of the muscle

Which muscle fiber functions as a stretch receptor?

• Tendon fibers
• Muscle spindle fibers
• Extrafusal muscle fibers

• Intrafusal muscle fibers

A single muscle fiber contains a bundle of myofibrils. Each bundle consists of what two things?

• actin and myosin filaments
• actin and troponin filaments
• myosin and troponin filaments
• actin and sarcomere filaments

The neuromuscular junction describes the synapse between...

• motor neuron and a muscle fiber
• motor neuron and a nerve cell
• sensory neuron and a muscle fiber
• motor neuron and a bone cell

The strength of a muscular contraction is determined by...

• level of hydration and time of day
• average rate of firing of various motor units

• amount of oxygen in the blood and body temperature
• duration of the contraction and muscle fiber type

What is the role of Golgi tendon organs?

• They help maintain posture and adjust to maintain body positions

• They detect the total amount of stretch exerted by muscle

• They control independent limb movements

• They send efferent axons to the primary motor cortex