Page 115 - Science Class 06
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our back. These bones help us to bend our Floa ng ribs : The last two pairs of ribs i.e.,
back. It also protects the spinal cord. eleventh and twel h are known as floa ng
ribs because their one end is free.
Limbs
The bones suppor ng the part of our body
and the por on below the stomach
cons tute a bony structure called pelvic
bones. Hand is made up of twenty seven
small bones which help it to grip and hold
Backbone Spinal Cord of Human Body
things.
Rib Cage
The total weight of our body falls on the
Rib cage occupies the chest region. It is bones of feet and toes. Each foot consists of
cone-shaped structure made up of twelve twenty six bones, while the whole leg has
pairs of ribs. Ribs are a ached to vertebrae thirty one bones.
at the back which curve around to form a
cage.
Ten pairs of ribs are a ached to the breast
The human skeletal system consists of
bone at the front.
total 206 bones. But at the me of birth
Two pairs of lower ribs are free at front. we have about 350 bones in our bodies.
These are called as free-floa ng ribs. But, when we grow up many bones fuse
Rib cage is set up in such a way that it can together to form long bones.
contract and expand during the process of
breathing.
Rib cage protects the underlying lungs, 1. Give examples of two vertebrate and
two invertebrate animals.
heart and some part of liver.
2. Are all mul cellular organisms
vertebrates?
3. What are the bones made up of?
4. How many pairs of ribs are there in our
rib cage?
MOVEMENT AND LOCOMOTION
We can divide rib into:
The movement of an organism from one place
True ribs : The first seven ribs are called
to another is known as locomo on. A few
true ribs.
examples of locomo on are walking, running,
False ribs : The next three pairs of ribs, i.e.,
swimming, etc. However, humans have
eighth, nineth and tenth are called false
invented many other types of locomo on
ribs.
through technological advancements in
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