REVISION PPT FOR SA II

CLASS VI

MOVEMENTS IN THE BODY

PREPARED BY

VIKRANT V. PURANDARE

1] Complete the flow chart including the levels of

organization in a human body.

cells

Tissues

Organs

Organ system

Human body

2] Define:

a) Locomotion: • external movement from one place to

another

• Thicker in the middle and tappers at both ends

b) Streamlined body :

• X-rays are special rays that can pass through the

soft tissues but not through the bones

• Earthworm has bristle like structure on

the underside of its body called setae.

• At the place of the joint, the ends of the two bones

are covered with a soft tissue. d)Cartilage :

e) x-rays :

c) Setae:

3] Differentiate:

a) Unicllular and multicellular organisms

Unicellular organisms

Multicellular organisms

• Organisms made up of only one cell

• Organisms made up of multiple cells

• Ex. Amoeba, algae • Ex. Human, animal,

birds

b) Ligament and Tendon

Fibrous tissue that connects

muscles to bones

Tissue which connects

two bones together.

Tendon Ligament

Tissue which connects

two bones together.

Tissue which connects

two bones together.

EndoskeletonExoskeleton

c) Exoskeleton and Endoskeleton

Tissue which connects

two bones together.

Tissue which connects

two bones together.

4] Explain the movement in the following

organisms:

• The snail moves with the help of a muscular organ known as the FOOT.

• It makes wave like movements by expanding and contracting the muscles in the foot.

• It also secrete a slimy substance known as the MUCOUS that enables the snail to move with ease.

• The body of a fish is specially designed for swimming that

is they have a STREAMLINED body. This shape allows

water to move easily around the body and offers least

resistance to its flow.

• They also swim with the help of FINS which help them in

balancing and changing the direction . It has a SAC like stracture

called SWIM BLADDER filled with air and keeps the fish afloat.

• To move forward fishes move their tails from side to side and this zigzag movement pushes the water and propels the fish forward.

• Birds have STREAMLINED

body which makes it easy for

them to move through air. The

air can easily cut through the

sides of the body and offers

least resistant.

• They have HOLLOW bones which makes the body

light weight and fit for flying.

• The chest muscles are very strong which enable bird to flap their wings by flying .

• The body is covered with feathers which keep them

warm while flying at height.

5] Write four functions of skeletal system

1) Support: It forms the framework of our body, provides shape and support, and holds the body upright.

2) Movement: It helps in the movement of various parts of the body.

3) Protection: It protects the internal organs of our body. The skull protects the brain, ribs protect the heart and lungs and so on

4) Formation of blood cells: Bones are filled with a spongy mass from inside called the bone marrow where blood cells are formed.

6] Explain the following :

1] RIB CAGE: The rib cage consists of 12 pairs of bones which are flat, thin and curved. These bones are joined with the backbone at the back and with breast bone in the front. The last two pairs of ribs are not attached in front and hence called Floating ribs. The rib cage protects organs such as heart and lungs and parts of stomach and kidneys.

2) Backbone or Spine: The backbone or spine runs from the base of the skull to the lower base and forms the central supporting rod for the skeleton. It is made up of 33 small bones called vertebrae which are joined to each other. This help us to bend and twist our back. It protects the spinal cord.

7) Explain about the following movable joints in the

body.

• Hinge joints allow movement in only two directions

backward and forward or upward and downward.

• Joints present in our knee elbow.

• The finger joints.

Hinge joint

Ball and socket joint

• In such a joint, the end of one bone is like a ball.

It fits perfectly into a cavity (socket) in the

other bone.

• This placement allows maximum movement in

all directions.

• Joint present between arm and shoulder.

7) Why are the last two pairs of ribs known as ‘floating

ribs’?

- The last two pairs of ribs are not attached in front / breast bone are hence called floating ribs.

8) What changes happens to the muscles when we

bend them and straighten our arms?

- When we bend our arms the muscles on the upper sides [biceps] contract to pull the bones up. At the same time the muscles of lower sides [triceps]relax. When the arms are straight again, biceps relax and triceps contract.

IDENTIFY THE PARTS IN THE HUMAN SKELETON

1

3

5

7

8

11

4

10

12

13

6

9

2

SKULL

COLLAR BONE

HUMEROUS

ULNA

RADIUS

BONES IN

FINGERS

TIBIA

FIBULA

BONES OF FEET

JAW BONE

SHOULDER

BLADE

BREAST BONE

PELVIS/HIP

BONE

IDENTIFY THE JOINTS

1

BALL AND SOCKET JOINT

6

5

4

2

PIVOT JOINT

BALL AND SOCKET

JOINT

GLIDING JOINT

8FIXED JOINT

7BALL AND

SOCKET JOINT

HINGE JOINT

GLIDING JOINT

HINGE JOINT3

THANK YOU