1.2 Skeletal Muscle Characteristics & Structure

W - muscle shortens to generate force

• contractility

• excitability

• extensibility

• elasticity

X - muscle contraction is stimulated by nerve stimuli

• contractility

• excitability

• extensibility

• elasticity

Y - muscle stretches past its resting length

• contractility

• excitability

• extensibility

• elasticity

Z - muscle returns to its resting length after contracting or stretching

• contractility

• excitability

• extensibility

• elasticity

muscle decreases in size due to decreased # of myofibrils and decreased fiber diameter from lack of use

• atrophy

• hypertrophy

• contractility

• elasticity

muscle increases in size due to increased # of myofibrils and increased fiber diameter from increase in physical activity

• atrophy

• hypertrophy

• contractility

• elasticity

Supply oxygen & nutrients to muscle & remove waste

• Capillaries

• Neurons

• Nucleus

• Mitochondria

skeletal muscles have many nuclei per cell

• multinucleate

• uninucleate

• striated

• unstriated

Tags

NGSS.HS-LS1-4

skeletal muscles have a striped appearance under a microscope

• multinucleate

• uninucleate

• striated

• unstriated

Skeletal muscles are under conscious control

• voluntary motion

• involuntary motion

• striated

• unstriated