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Human Body - A Working Machine

CLASS - 5Lesson-5

General ScienceLesson-5

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1. What does the ribcage consist of ?

A. The ribcage consists of 12 pairs of long curved bones called ribs.

2. What is the importance of backbone ?

A. The backbone protects the spinal cord, controls various involuntary actions. It helps us

to stand straight. The large number of movable joints present in it help the body to bend

forward, backward and sideward also.

3. How many kinds of nerves are there ? What are they ? Write the functions of

nerves.

A. There are three kinds of nerves : sensory nerves, motor nerves and mixed nerves.

Nerves are thread like structures which carry messages in the form of electrical

impulses.

4. What is skeleton ? What are its main functions ?

A. Skeleton is a framework of bones that supports our body and gives it a shape. Its main

functions are :

1) Skeleton gives support and shape to our body.

2) It protects the internal organs.

3) Bones together with muscles help in body movements.

4) Blood cells are formed in the bone marrow present in the cavities of long bones.

5. Name the main parts of the skeleton.

A. The main parts of the skeleton are : 1) The Skull, 2) The Ribcage, 3) The Backbone and

4) The Limbs.

6. What are limbs ?

A. Arms and legs are together called limbs.

7. Mention the causes of flat feet.

A. The causes of flat feet are :

1) Wrong methods of walking.

2) Wearing shoes which do not support the feet at the right place.

The Human Body

The Human Body

6. Human Body - A Working Machine

Unit-I

Answer the following questions.A

3

8. What is a joint ? How many kinds of joints are there ? What are they ?

A. The point where two bones join is called a joint. Two kinds of joints are there. They are :

1) Movable joints and 2) Immovable joints.

9. What are movable and immovable joints ? Give examples.

A. Joints which allow movement are called movable joints. e.g. : Hinge joint, gliding joint,

ball and socket joint and pivot joint. Joints which do not allow movement are called

immovable joints. e.g : Joints of Skull.

10. How many kinds of muscles are there ? What are they ?

A. Muscles are mainly of three types. They are : 1) Voluntary muscles, 2) Involuntary

muscles and 3) Cardiac muscles.

11. How do muscles work ?

A. When the biceps contract the arm and hand get lifted up. When the triceps contract the

hand moves downwards and comes to its original position. Therefore, the upward and

downward movements of arm are brought about by the contraction and expansion of

biceps and triceps.

12. Name some internal organs present in your body.

A. Brain, lungs, liver, heart, pancreas and kidneys are some internal organs present in our

body.

13. Name the three parts of brain.

A. The brain has three main parts : cerebrum, cerebellum and medulla oblongata.

3) Deficiency of calcium.

4) Overweight or obesity.

1. The long bone in the upper arm is called ________

a) radius b) ulna c) humerus

2. The knee joint is a ________

a) hinge joint b) gliding joint c) pivot joint

3. Muscles in arms are called _________

a) voluntary muscles b) involuntary muscles c) cardiac muscles

4. The muscles of heart are _________

a) voluntary muscles b) involuntary muscles c) both a and b

Choose the correct answer.B

Workbook PartWorkbook Part

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1. The human skeleton consists of bones.

2. The backbone is called .

3. is the longest bone in the body.

4. The bones of the skull are .

5. The muscles of the heart are called muscles.

206

vertebral column

Femur

immovable

cardiac

1. The brain controls everything that happens in our body.

2. The spinal cord is the longest bone in the body.

3. Bones cannot move without muscles.

4. Deficiency of calcium is one of the reasons for flat feet.

5. The bones in the skull are movable.

a) Controls all the functions

of the body

b) Deficiency of calcium

c) Ball and Socket joint

d) Gliding joint

e) Hinge joint

C

Write 'True' or 'False'.D

Match the following.E

A B

5. This is the largest part of the brain.

a) cerebellum b) medulla oblongata c) cerebrum

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11. The nervous system is made up of .

12. The three main parts of the brain are , and .

13. The largest nerve in the body is .

14. Three kinds of nerves are , and .

Complete the following table.

1.

2.

3.

4.

5.

6.

7.

S.No. Name of the system Main organs Functions

1. The skeletal system consists of and .

2. Blood cells are formed in the .

3. Bones together with muscles .

4. The ribcage consists of .

5. The arms and legs are together called .

6. is the longest bone in the body.

7. The point where two bones join is called a .

8. Joints of skull are joints.

9. The three types of muscles in the body are , and .

10. Some internal organs are , and .

Complete the following with suitable words / expressions.I

II

WoksheetActivity with

Identify and circle the parts of body in the word search given below.

M N O P Q R S S K B

V T S K U L L T I A

S L I V E R U O D C

C U V W X Y N M N K

L Z A B C D G A E B

E E B O N E S C Y O

S F R G E H I H S N

J K A L R M N O P E

Q R I S V T U V W Z

X Y N H E A R T Z R

L I M B S K N E E C

III

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