Body Movements

Exercise:

1). Fill in the blanks.

a). Joints of the bones help in the movement of the body.

b). A combination of bones and cartilages forms the skeleton of the body.

c). The bones at the elbow are joined by a hinge joint.

d). The contraction of the muscles pulls the bones during movement.

2). Indicate true (T) and false (F) among the following statements.

a). The movement and locomotion of all animals is exactly the same.

(F)

b). The cartilages are harder than bones.

(F)

c) The finger bones do not have joints.

(F)

d). The forearm has two bones.

(T)

e). Cockroaches have an outer skeleton.

(T)

3). Match the items in Column I with one or more items of Column II.

Column I Column II

1). Upper jaw have fins on the body.

2). Fish has an outer skeleton.

3). Ribs can fly in the air.

4). Snail is an immovable joint.

5). Cockroach protect the heart

Shows very slow movement

Have a streamlined body

Answer:

1). Upper jaw – is an immovable joint.

2). Fish – Have a streamlined body, have fins on the body

3). Ribs – protect the heart

4). Snail – Shows very slow movement

5). Cockroach – can fly in the air, has an outer skeleton.

4). Answer the following:

a). What is a ball and socket joint?

The rounded bone fits into the cavity of the other bone. Such a joint is called a ball and socket joint. This joint allows movements in all directions.

b). Which of the skull bones are movable?

In the skull only the lower jaw is movable.

c). Why can our elbow not move backward?

Elbow has a hinge joint that allows movement in only one direction, therefore, our elbow does not move backward.

Additional Questions:

1). Write the different ways in which animals move from one place to another?

Walk, run, fly, jump, creep, crawl, slither and swim – these are the different ways in which animals move from one place to another.

2). What are joints?

The places in the body where two parts of our body seem to be joined together are called joints.

3). Name the different types of joints found in a human body?

Ball and socket joints, pivotal joints, hinge joints and fixed joints are the types of joints found in the human body.

4). What are pivotal joints?

The joints where our neck joins the head is pivotal joint. It allows us to bend our head forward and backward and turn the head to our right or left.

5). What gives a shape to our body?

All the bones in our body form a framework to give a shape to our body. This framework is called skeleton.

6). What are carples?

Several small bones that make the wrist are called as carples.

7). What is a skull?

A skull is made up of many bones joined together. It encloses and protects a very important part of the body, the brain.

8). What is cartilage?

Additional parts of the skeleton that are not as hard as the bones and which can be bent are called cartilage.

Write a note on:

1). Movement of Earthworm

The body of an earthworm is made up of many rings joined end to end. An earthworm does not have bones. It has muscles that help to extend and shorten the body. During the movement, the earthworm first extends the front part of the body keeping the rear portion fixed to the ground. Then it fixes the front end and releases the rear end. It then shortens the body and pulls the rear end forward. This makes it move forward by a small distance. Repeating such muscle expansions and contractions, the earthworm can move through the soil.

True or false

1). Bones cannot be bent.

False

2). We can bend or move our body where bones meet.

True

3). Hinge joints allow only a back and forth movement.

True.

4). We can move our upper jaw.

False

5). X-ray images are used to find possible injuries that might have happened to the bones.

True.

6). Cartilage is found in the ear lobe.