Question 1: Name the large muscle located at the front of the thigh that is primarily responsible for extending the knee joint.

Answer: Quadriceps

Question 2: Describe the main function of the biceps brachii muscle during arm movement.

Answer: The biceps brachii contracts to flex the elbow and supinate the forearm.

Question 3: Identify and name the muscle group that runs along the back of your upper arm.

Answer: Triceps

Question 4: Explain why the calf muscles are important for activities such as running and jumping.

Answer: Calf muscles, mainly the gastrocnemius and soleus, help propel the body forward and upward by plantar flexing the foot, which is essential for pushing off during running and jumping.

Question 5: Draw a simple sketch of the human upper arm, labeling the biceps brachii and triceps brachii muscles. Include an arrow indicating the direction of muscle contraction during arm flexion.

Answer: A correct sketch would show the upper arm with biceps located at the front, labeled clearly, and triceps at the back, also labeled. An arrow should point from the biceps towards the shoulder to indicate contraction during flexion.

Question 6: Identify the muscle responsible for the movement of lifting the shoulder and raising the arm sideways.

Answer: Deltoid

Question 7: Describe the role of the abdominal muscles in maintaining good posture and stability during physical activity.

Answer: The abdominal muscles, including the rectus abdominis and obliques, support the spine, help maintain upright posture, and stabilize the core during movement.

Question 8: Name the muscle that is primarily involved in breathing and is located below the lungs.

Answer: Diaphragm

Question 9: Explain how the muscles work in pairs during movement, using an example involving arm flexion and extension.

Answer: Muscles work in pairs called antagonistic pairs. During arm flexion, the biceps contract while the triceps relax; during extension, the triceps contract while the biceps relax. This coordinated action allows smooth movement.

Question 10: Sketch the muscles involved in a jumping action, focusing on the muscles used in the lower body. Label at least three muscles.

Answer: A correct sketch would show muscles such as the quadriceps, gluteus maximus, and calf muscles, each labeled clearly, illustrating their involvement in the jumping movement.