Human Movement Science Flashcards

What is the primary function of the sagittal plane in human movement?

Answer: Flexion and extension

The sagittal plane divides the body into left and right halves. Movements that occur within this plane are primarily flexion (decreasing the angle between two body parts) and extension (increasing the angle between two body parts), such as bicep curls, squats, or walking. These movements involve forward and backward motion.

Which muscle is primarily responsible for hip extension?

Answer: Gluteus maximus

The gluteus maximus is the largest and most superficial of the gluteal muscles and is the primary muscle responsible for hip extension. This action involves moving the leg backward from the hip joint, as seen in activities like standing up from a squat, climbing stairs, or running. While hamstrings also contribute, the gluteus maximus is the main mover for powerful hip extension.

What role does the transverse abdominis play in core stabilization?

Answer: Stabilizes the lumbar spine

The transverse abdominis (TrA) is the deepest of the abdominal muscles and plays a crucial role in core stabilization. It acts like a natural corset, compressing the abdominal contents and increasing intra-abdominal pressure, which helps to stabilize the lumbar spine and pelvis before limb movements occur. This deep stabilization is vital for preventing lower back pain and improving movement efficiency.

Which movement occurs in the frontal plane?

Answer: Side lunges

The frontal plane divides the body into front (anterior) and back (posterior) portions. Movements in the frontal plane involve abduction (moving a limb away from the midline) and adduction (moving a limb towards the midline), or lateral flexion. Side lunges involve moving the leg out to the side, which is an abduction movement in the frontal plane.

What is the function of the kinetic chain in movement?

Answer: Links joints and muscles for efficient motion

The kinetic chain refers to the concept that the human body's joints and muscles are interconnected and work together in a sequence to produce efficient movement. When one segment of the chain moves, it affects the movement of other segments, creating a coordinated action. Understanding the kinetic chain is crucial in corrective exercise for identifying how dysfunctions in one area can impact overall movement patterns and performance.

Which joint type allows for the greatest range of motion?

Answer: Ball-and-socket joint

Ball-and-socket joints, such as the hip and shoulder, allow for the greatest range of motion among all joint types. Their spherical head (ball) fits into a cup-like depression (socket), enabling movement in all three planes: flexion/extension, abduction/adduction, and internal/external rotation, as well as circumduction. This multi-axial movement capability is unique to this joint structure.