Flexors
When running downhill, certain muscles work to control the knee's bend. Name and explain the roles of these muscles in this action and how they interact with the leg bones.
The Semitendinosus, Semimembranosus, and Biceps Femoris control knee bend, acting on the femur and tibia.
A gymnast lifts their leg to the side while performing a routine. Explain which abductor muscle(s) are responsible for this movement and describe the bones they influence.
The Sartorius lifts the leg away from the body, involving the femur and pelvis.
A person rises from a squatting position, extending their hips. Name and describe how the muscles work to extend the thigh, and identify the bones they act upon.
The Gluteus Maximus and hamstrings extend the hip, acting on the femur and pelvis.
A person is crossing their legs while sitting. Name and describe the role of the muscle in bringing the leg toward the body's midline, and mention the bones involved.
The Adductor Magnus brings the leg toward the midline, acting on the femur and pelvis.
When reaching behind to grab an item, a person rotates their torso. Name and describe how the muscle assists in this twisting motion and identify the associated bones.
The External Oblique twists the torso, involving the ribs and pelvis.
A rock climber uses their arms to pull themselves up. Describe which muscles work to bend the elbow and bring the forearm closer to the upper arm, including the bones involved in this movement.
The Biceps Brachii bends the elbow, bringing the radius and ulna toward the humerus.
When shrugging to indicate uncertainty, a person uses which muscle? Describe the muscle's role in lifting the shoulder and the bones it influences.
The Trapezius lifts the shoulder by acting on the scapula and clavicle.
During a high jump, the jumper straightens their knee to push off the ground. Explain which muscles create this movement, noting the bones involved.
The Quadriceps Femoris extend the knee and Gastrocnemius flexes the ankle, working with the femur, tibia, and calcaneus.
A person walking on tiptoes relies on this muscle to stabilize the foot. Name and explain how the muscle maintains balance and identify the bones involved.
Tibialis Anterior on tiptoes: This muscle stabilizes the foot by acting on the tibia and foot bones.