Question 1: Name three major muscles located in the upper arm.

Answer: Biceps brachii, triceps brachii, brachialis.

Question 2: Explain the difference between voluntary and involuntary muscles, providing one example of each.

Answer: Voluntary muscles are muscles we control consciously, such as the biceps. Involuntary muscles are muscles we cannot consciously control, such as the heart.

Question 3: Describe the role of the quadriceps during running.

Answer: The quadriceps help extend the knee joint, allowing the leg to straighten and push off the ground during running.

Question 4: Identify which muscle group is primarily used when performing a bench press exercise.

Answer: Pectoral muscles (pectoralis major).

Question 5: Sketch a simple diagram of the major muscles in the front of the upper leg, indicating the quadriceps group. Use the large blank space provided for your drawing.

Answer: A correct sketch would show the front of the thigh with four sections labeled as the quadriceps: rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius. The muscles should be depicted as large, muscle bellies in the front of the femur.

Question 6: List two muscles that are involved in bending the elbow.

Answer: Biceps brachii and brachialis.

Question 7: Describe how muscles work in pairs during movement, using the example of the biceps and triceps.

Answer: When the biceps contract to bend the arm (flexion), the triceps relax. When the arm straightens (extension), the triceps contract and the biceps relax. This work in pairs to produce smooth movement.

Question 8: Identify the main muscle group responsible for flexing the trunk forward when doing sit-ups.

Answer: Rectus abdominis.

Question 9: Explain why muscles need rest after exercise.

Answer: Muscles need rest to recover from fatigue, repair damaged tissues, and prevent injury. Rest also allows muscles to strengthen for future activities.

Question 10: Name the muscle that is primarily used when you lift a heavy object from the ground using your legs.

Answer: The gluteus maximus and the quadriceps.