What limits the force and power of muscles during exercise?

• Increased oxygen supply

• Rate of ATP production

• Excess glycogen

• High creatine phosphate levels

What is a consequence of depleted creatine phosphate and glycogen during exercise?

• Enhanced muscle performance

• Increased muscle force

• Hindered muscle performance

• Unlimited energy supply

What happens to lactic acid concentration during high-intensity exercise?

• It decreases

• It remains constant

• It increases

• It disappears

What does neuromuscular fatigue mean?

• Muscles receive excessive signals from the CNS

• Muscles are unable to receive signals from the CNS

• Muscles contract too frequently

• Muscles function better than normal

What is muscular fatigue?

• Muscles contract too easily

• Muscles can't contract properly

• Muscles are overly relaxed

• Muscles receive excessive signals

What is required for muscle contraction?

• Oxygen release

• Calcium release

• Potassium release

• Sodium release

What happens if calcium stores are reduced?

• Increased muscle contraction

• Actin and myosin attach more often

• Actin and myosin will not attach as often

• Enhanced calcium release

What is the role of acetylcholine in the body?

• It is a hormone that regulates blood sugar levels.

• It is a neurotransmitter that stimulates skeletal muscles and the parasympathetic nervous system.

• It is an enzyme that breaks down proteins in the stomach.

• It is a vitamin that supports bone health.

What does the area labeled "O₂ deficit" represent in the context of exercise?

• The initial lack of oxygen supply at the start of exercise

• The excess oxygen consumed after exercise

• The steady-state oxygen consumption

• The resting oxygen consumption

What does the area labeled "EPOC" indicate on the graph?

• The oxygen consumed during exercise

• The oxygen consumed after exercise to restore the body to resting state

• The oxygen deficit at the start of exercise

• The steady-state oxygen consumption