What makes muscles grow?

How many muscles are in the human body?

• About 300

• More than 700

• Over 600

• Exactly 500

What percentage of our body weight is made up by muscles?

• More than 2/3

• Between 1/3 and 1/2

• Less than 1/5

• About 1/4

What happens when the brain sends a signal to motor neurons in the arm?

• Muscles become rigid

• Bones move independently

• No visible movement occurs

• Muscles contract and relax

What happens when muscles are exposed to stress?

• They lose all ability to contract

• They immediately begin to shrink

• No significant changes occur

• They undergo cellular changes leading to growth

What triggers the muscle-building process?

• Microscopic damage to muscle fibers

• Complete avoidance of physical stress

• Lack of movement

• High carbohydrate intake

What is the result of exposing muscles to higher workloads?

• Muscle hypertrophy

• Immediate muscle shrinkage

• Decreased muscle function

• No change in muscle size

What is muscular atrophy?

• Shrinking of muscles due to lack of resistance

• Increase in muscle flexibility

• Rapid growth of muscle tissue

• Strengthening of muscle fibers

What is the effect of eccentric contraction on muscles?

• Promotes new muscle growth

• Reduces muscle strength

• Leads to immediate muscle repair

• Causes muscle atrophy

What is necessary for muscle repair and growth?

• Proper nutrition, hormones, and rest

• Avoiding all forms of stress on muscles

• Continuous activity without rest

• Low protein intake

What role does protein play in muscle growth?

• Decreases muscle mass

• Provides building blocks for new tissue

• Increases muscle damage

• Has no effect on muscles