Body movements
Questions (To be done in the Science file)
1. Write three functions of skeleton.
2. Distinguish between bone and cartilage.
3. Distinguish between tendons and ligaments.
4. Describe the structure of ball and socket joint.
5. What are the features which help the birds to fly?
6. Why can our elbow not move backwards?
7. How do muscles work together to move a bone? Explain.
Answers
Answer: 1- It gives the body its shape, allows movement, makes blood cells, provides protection for organs and stores minerals.
2- Bones
Bones are the hard, inelastic and a tough organ that forms part of the vertebral skeleton.
Cartilage
Cartilage is a soft, elastic and flexible connective tissue that protects the bone from rubbing against each other.
3- tendon
It connects the end of the muscles to any part of the bone.
It is a tough and inelastic structure.
There is usually one tendon per muscle.
Ligament
It connects the ends of the bones only at joints.
It is highly elastic and flexible.
Many ligaments are usually present per joint.
4- The ball and socket joint (or spheroid joint) is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone. The distal bone is capable of motion around an indefinite number of axes, which have one common center.
5- Birds have hollow bones that are very light and strong.
Their feathers are light and the shape of their wings is perfect for catching the air.
Their lungs are great at getting oxygen and very efficient, so they can fly for very long distances without getting tired.
They eat lots of high-energy food.
6- Our elbow cannot move backwards because it has a hinge joint which allows the movement in one plane only
7- Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
hope it helpssss☺
Answer:
Answer: 1- It gives the body its shape, allows movement, makes blood cells, provides protection for organs and stores minerals.
2- Bones
Bones are the hard, inelastic and a tough organ that forms part of the vertebral skeleton.
Cartilage
Cartilage is a soft, elastic and flexible connective tissue that protects the bone from rubbing against each other.
3- tendon
It connects the end of the muscles to any part of the bone.
It is a tough and inelastic structure.
There is usually one tendon per muscle.
Ligament
It connects the ends of the bones only at joints.
It is highly elastic and flexible.
Many ligaments are usually present per joint.
4- The ball and socket joint (or spheroid joint) is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone. The distal bone is capable of motion around an indefinite number of axes, which have one common center.
5- Birds have hollow bones that are very light and strong.
Their feathers are light and the shape of their wings is perfect for catching the air.
Their lungs are great at getting oxygen and very efficient, so they can fly for very long distances without getting tired.
They eat lots of high-energy food.
6- Our elbow cannot move backwards because it has a hinge joint which allows the movement in one plane only
7- Muscles move body parts by contracting and then relaxing. Muscles can pull bones, but they can't push them back to the original position. So they work in pairs of flexors and extensors. The flexor contracts to bend a limb at a joint.
Explanation: