Muscular System - Part Two

Muscle adaptation is the process by which muscles change in response to training or environmental demands.

• True

• False

Fast fibers fatigue quickly because:

• They have a high concentration of mitochondria.

• They rely on anaerobic metabolism.

• They have a rich supply of blood vessels.

• They contain a lot of myoglobin.

Fast fibers are crucial for (a)   activities.

• Endurance
• Strength and power
• Flexibility
• Balance

Slow fibers are characterized by:

(a)  

• High endurance and resistance to fatigue
• Quick contraction and high power output
• Low endurance and quick fatigue
• High speed and low resistance

Intermediate fibers are also known as (a)   .

• Type I
• Type IIa
• Type IIb
• Type III

Intermediate fibers are well-suited for activities requiring a combination of speed, power, and endurance because they:

• Are highly resistant to fatigue and provide sustained energy.

• Have a high capacity for both aerobic and anaerobic energy production.

• Are the largest and most powerful muscle fibers.

• Are primarily used for short bursts of speed and power.

Muscles with a predominance of fast fibers appear lighter in colour and are referred to as ​ (a)   muscles.

• White
• Red
• Blue
• Gray

Hypertrophy refers to (a)   in muscle size.

• Decrease
• Increase
• No change

Atrophy is the decrease in muscle size resulting from a reduction in muscle fiber diameter and (a)   .

• Protein content
• Increased fat storage
• Enhanced blood flow
• Higher metabolic rate

Anaerobic endurance is crucial for activities like ________.

• Sprinting, weightlifting, and high-intensity interval training

• Yoga, meditation, and stretching

• Walking, jogging, and cycling

• Swimming, dancing, and aerobics