human locomotion and movement
DESCRIPTION
locomotion in humanTRANSCRIPT
HUMAN LOCOMOTION & MOVEMENT
JOINTS
• Is the place where bones meet & are held together by ligaments.
HINGE JOINT
• Found in elbows & phalanges of the toes & fingers
• Allow the lower leg to swing back & forth
• Allow the movement of bones in one plate
HINGE JOINT
ELBOW
BALL-AND-SOCKET JOINT
• Allow the bones to rotate in all direction
• Allow the swinging of arms and legs in a circular motion
• Eg.shoulder joint-between humerus & pectoral girdle
• Hip joint-between femur & pelvic girdle
HOW MOVEMENT IS BROUGHT ABOUT IN A
LIMB…?
BENDING THE FOREARM ( FOR ARM RAISED )
• Biceps contract-at the same time, triceps relaxes
• As the result-elbow joint bends, and the forearm moves upwards
STRAIGHTENING THE FOREARM ( FOREARM LOWERED )
• Triceps contracts-biceps relaxes-and the forearm is straightened
MUSCLE INVOLVED IN WALKING
• The calf muscle contracts and raises the heel-it pushes the ball of the foot against the ground by exerting a forward thrust
• The hamstring muscle contract to pull the femur back and bend the knee. The leg is raised
• The weight of the body is now supported by the left leg since the right foot loses contact with the ground
• The quadriceps muscle will contract, pull the femur forward and extends the leg-the thigh is extended
• After the extension of the legs, the foot with the heel touching the ground first will regain contact with the ground again
• The weight of the body is supported by the right leg. Now the whole sequence is repeated with the left leg
WALKING