Muscular P7

What causes muscle fatigue during strenuous and prolonged activity?

• Ionic imbalances occur

• Muscle fibers increase

• Blood flow decreases

• Nerve impulses stop

What accumulates in the muscle during muscle fatigue?

• Lactic acid

• Calcium

• Glucose

• Oxygen

What happens to the energy (ATP) supply during muscle fatigue?

• Decreases

• Increases

• Remains constant

• Doubles

How is the oxygen deficit repaid after exercise?

• Rapid, deep breathing

• Increased heart rate

• Muscle relaxation

• Increased blood pressure

What is a characteristic of isotonic contractions?

• The muscle shortens and movement occurs

• The muscle lengthens and no movement occurs

• The muscle remains the same length

• The muscle contracts without movement

Which of the following is an example of an isotonic contraction?

• Bending the knee

• Pushing against a wall

• Holding a weight steady

• Standing still

What happens during isometric contractions?

• Tension in the muscles increases

• The muscle shortens

• The muscle lengthens

• The muscle relaxes

Which of the following is an example of an isometric contraction?

• Pushing against a wall with bent elbows

• Lifting a weight

• Running

• Jumping

What keeps muscles healthy and ready to react?

• Muscle tone

• Muscle size

• Muscle length

• Muscle strength

What is the result of a staggered series of nerve impulses delivered to different cells within the muscle?

• Muscle tone

• Muscle fatigue

• Muscle atrophy

• Muscle relaxation