Class 6 Body movements Notes
KEYWORDS
Chitin: a protein which makes the internal body of a cockroach.
Ball and Socket joint: a joint that allows movement in all directions.
Exoskeleton: the hard covering on the outside of organisms such as snails and turtles.
Skull: the bony part of the head that encloses the brain.
Cartilage: a tough elastic tissue softer than a bone found at the ends of bones at the joints.
Bone marrow: a fatty substance that fills the hollow cavity within big bones.
Ligament: strong flexible bands of connective tissue holding the bones together.
Immovable joint: a joint that does not permit the movement of bones.
Movement: change the position of any part of the body of an organism.
Joint: the place where two or more bones meet.
Skeleton: the framework of bones.
Locomotion: the movement of an organism as a whole.
Muscles: bones are moved by the expansion and contraction of muscles.
Backbone: vertebral column or spine present at the backside of the body.
Streamlined shape: narrow in front and broader in the middle (spindle-shaped)
Endoskeleton: hard skeleton supporting body from inside.
POINTS TO REMEMBER
• The skull consists of the cranium and facial bones. Most of the joints of the skull are fixed.
• Vertebrates are animals with a vertebral column. They move with the help of bones and muscles.
• Cockroaches and snails are invertebrate animals and move by crawling.
• Fish have fins for locomotion and birds have wings for flying.
• There are three types of joints – movable, partially movable and immovable.
• There are 206 bones in an adult human.
• Movable joints allow the movement but immovable joints do not allow any movement.
• There are two types of the skeleton: exoskeleton and endoskeleton.
• Ball and socket joints allow the greatest freedom of movement. The joint of the upper arm and shoulder blade is a ball and socket joint. So it is the joint of the thigh bone and hip bone.
Multiple Choice Questions
1. The body part used by snake for locomotion is
(a) legs
(b) feet
(c) fins
(d) whole body
2. The total number of bones in human
body is
(a) 206
(b) 306
3. Which of the following animal has an endoskeleton?
(a) mosquito
(b) cockroach
(c) crab
(d) human
4. Elbow joint is an example of
(a) hinge joint
(b) immovable joint
(c) gliding joint
(d) pivot joint
5. One of the following does not have a hinge joint. This one is
(a) elbow
(b) knee
(c) shoulder
(d) jaw
6. Fixed joint is found in
(a) wrist
(b) skull
(c) elbow
(d) ankle
Ans:
1. (d) 2. (a) 3. (d) 4. (a) 5. (d) 6. (b)
Fill in the blanks with suitable words.
1. Joints which are permanently fixed are called——— joints.
2. Birds are the most common————– animal.
3. The body of an———- is made up of the ring-like segments.
Ans: 1. Joints which are permanently fixed are called immovable joints.
2. Birds are the most common flying animal.
3. The body of an earthworm is made up of ring-like segments.
C. State whether the following statements are True or False
1. Snails move with the help of wings.
2. Fishes have swim bladder for swimming.
3. Tendon joint one bone to another at a joint.
4. The first two pairs of ribs are called as floating.
5. Both fish and birds have streamlined shapes.
Ans: 1. False, 2. False, 3. False, 4. False, 5. True
CLASS VI SCIENCE