This PSEB 6th Class Science Notes Chapter 8 Body Movements will help you in revision during exams.
PSEB 6th Class Science Notes Chapter 8 Body Movements
→ Movement is a change in the position of any part of the body of an organism.
→ Locomotion is the movement of the whole body of an organism from one place to another.
→ Animals show locomotion and other types of movements but plants do not locomotion though they show some other types of movements.
→ Walking by man, swimming by fishes, running by horse, crawling by a snake, jumping by grasshopper, and flying by birds, etc. are different modes of locomotion.
→ The purpose of locomotion by animals is to find water, food, shelter, and protect themselves from enemies.
→ The framework made up of bones that give support to the body is known as the skeleton.
→ Bones are hard and rigid whereas cartilage is smooth and flexible.
→ The human skeleton comprises bones and cartilages.
→ The human body has 300 bones at the time of birth.
→ The adult human body has 206 bones.
→ The rib cage is made up of ribs, backbone, and chest bone. It protects the internal parts of the body.
→ Skull encloses protects the brain.
→ A Joint is a place where bones meet together.
→ The ligament is an elastic tissue that connects bones together.
→ The movement of the body depends upon the contraction of muscles. These muscles always work in pairs.
→ Gait is the pattern of movement of limbs of animals.
→ The earthworm moves by contraction and extension of the muscles of its body.
→ A snail moves with the help of a large sticky muscular foot.
→ A cockroach can walk, run. climb and fly.
→ Forelimbs of birds are modified into wings that help in flight.
→ The body of fish is streamlined and it moves by fins placed laterally on its body.
→ Birds have streamlined bodies and hollow lightweight bones which help them during g flight.
→ Snakes move by creeping on their belly.
→ Different types of joints allow movements in different directions.
→ Our body has many joints – The ball and socket joint, the Hinge joint, the Fixed joint, and the Pivotal joint.
→ The ball and socket joint allows the movement in a circular form or in all directions.
→ The hinge joint allows back and forth movement.
→ The pivotal joint allows the movement forward and backward, right or left. The joint of the neck and head is an example.
→ Fixed joints are immovable.
→ X-ray helps in counting the number of bones and studying the shape of bones in all bodies.
→ Movement: is a change in the position of any part of the body of an organism.
→ Locomotion: is the movement of the whole body of an organism from one place to another.
→ Bone: It is the part of the skeleton which is hard in nature.
→ Joint: A joint is a part of the body where two or more bones meet to allow some type of movement.
→ Cartilage: Smooth, thick, and flexible tissue found in joints.
→ Fixed Joints: The joints at which bones cannot move is known as fixed joint.
→ Moveable Joints: The joints where the movement of the bones is possible are called movable joints.
→ Skeleton: The framework of the body that gives support and shape to the body.
→ Streamlined body: A body that tapers at both ends is called a streamlined body.
→ Tendon: The strong, fibrous tissue which attaches muscles to bones is called a tendon.
→ Ligaments: Strong, flexible tissue which connects two bones.
→ Pelvis: The large bony bowl formed by the fusion of hip bones and the last two parts of the backbone is known as the pelvis.
→ Pectoral Girdle: The girdle that supports the bones of the arm is called the pectoral girdle.
→ Pelvic Girdle: The girdle that supports the bones of the legs is called the pelvic girdle.
→ Vertebrae: These are the small ring-shaped bones present in the backbone.
→ Dislocation: The dislodging of bones at the joints from their normal positions is called dislocation.