LS 2 4 The Skeletal System

THE SKELETAL
SYSTEM Learning Strand 2
Michael Cachero Gelacio / Teacher III – District I ALS Coordinator

Enumerate five functions of the skeletal system.
1. ________________________________
2. ________________________________
3. ________________________________
4. ________________________________
5. ________________________________
What makes up the skeletal system?
6. ________________________________
Describe how the skeletal system works during movement.
7. ________________________________
Give three injuries or diseases associated with the skeletal system.
8. ________________________________
9. ________________________________
10. _______________________________

 EXOSKELETON or hard supporting structures found
outside the body. Example: Squids, Insects
 ENDOSKELETON or the hard supporting structures
found inside the body. Example: in higher animals like
mammals.

 composed of bones arranged in a way to provide the
best possible support to the organs of the body and to
enable you to do a lot of things.
1. Giving support to and providing the framework of
your body.
2. Maintains the shape of the body.
3. Supports the weight of your body
4. The hard structure of the skeletal system protects
internal organs.
5. Helps in movement.
6. Helps in the production of Blood cells.

Can you think of three examples of
movement that your body can make? How do
you think each of these movements is
achieved?

 Your body is able to move because muscles
are attached to bones.
 Muscles are made up of tissue fibers that are
able to contract.

Muscles are attached to bones on at least two
points by dense fibrous structures called
TENDONS.
When muscles contract, bones are moved and
brought closer to each other. This series of
muscle contractions causes your body to move.

The skeletal system is made up of bones that are
very hard.
Bones are hard because they contain calcium.
Calcium is a mineral that gets deposited in our
bones and teeth to make them tough and sturdy.

Lastly, the bones of the skeletal system contain
bone marrow, which is important in the production
of blood. It is found in the middle portion of long
bones.

TRUE or FALSE.
1. The human skeletal system is found inside the body.
2. Bones make up the skeletal system.
3. Bones are hard because of the mineral phosphorus.
4. Teeth and bones are similar in mineral content.
5. The muscular system makes the body move with the
help of the bones through a series of contractions.
6. The skeletal system protects vital organs like the heart
and lungs.
7. The skeleton acts as the framework of the human body.
8. We could stand upright even without the skeletal
system.
9. The skeletal system is valuable only because of its
strength.
10. Bone marrow is important for blood production.

 In an adult, the skeletal system is
made up of 206 bones arranged in
the best possible way to provide you
with a lot of strength and mobility.

From the drawing, what did you notice about the
skeletal system?
Look at the figure one more time and write down
your observations about the skeletal system in the
blanks below.

A. The skeletal system is made up of many
separate bones.
(In fact, there are 206 bones in the adult
skeletal system.)
B. Not all bones appear similar.
(The bones are indeed of varying shapes and
sizes. Each one is so designed to perform a
specific function.)
C. The skeletal system is symmetrical.
(SYMMETRY means having similar parts on
the left and right sides of the body.)

 The skeletal system is made up of bones
that are arranged in a unique structure.
Bones are held together by fibrous
structures called LIGAMENTS.
Ligaments maintain the arrangement of
the bones.
LIGAMENTS, a short band of tough,
flexible, fibrous connective tissue that
connects two bones or cartilages or
holds together a joint.

 The bones in the central or middle
portions of the body are for making
GROSS MOTOR MOVEMENTS.
 These are big and powerful
movements that you make when you
jump, run, or somersault.
 The more peripheral or sideward parts
have smaller bones. These bones are for
FINE MOTOR MOVEMENTS.
 Examples of these fine movements
are writing and stitching..

 PROXIMODISTAL GROWTH,
means growth that proceeds
from the center of the body to
the extremities.
 Because of this, you would
expect adults to have finer
motor movements than
babies.

1. There are 208 bones in the human body.
2. The skeleton is the structural arrangement of bones in
the human body.
3. All bones are of the same size.
4. All bones are of the same shape.
5. Bones give shape to the body.
6. Painting a picture is a fine motor movement.
7. Writing is a gross motor movement.
8. The bones in the central part of the body are generally
larger.
9. Proximodistal pattern of bone development means
bone development starts from the center and
progresses to the extremities of the body.
10. The bone of the head is called the skull.

• The bone of your head.
• Protects the brain and other
sensory organs from harm. It is
one of the strongest bones in
your body.
• The skull is not a single bone;
it is composed of 26 bones
fused together to protect the
structure of the head.

• The vertebrae are small but
thick bones that comprise the
spine or the backbone.
• The structure of the vertebrae
allows a greater range of
motion to the trunk of the body.
• The vertebrae protect the
spinal cord.

• Twelve pairs of ribs are
attached to the sternum or
breastplate to form the ribcage.
• The ribcage protects the vital
organs of the body such as the
heart, lungs, and liver.

• made up of several thick and
wide bones that protect the
organs of the reproductive and
urinary systems.
• The structure of the pelvis
greatly affects the outcome of a
pregnancy.
• Wider pelvises in women allow
the passage of the baby at birth

• the bone of the upper arm. The
humerus makes arm movements
possible.

• the bone of the upper leg. It is the
longest bone in the body and it
greatly contributes to your height.

• The phalanges are the bones of
the hands and fingers.
• There are approximately 20
bones in each hand.
• The smaller bones of the hands
and fingers allow finer motor
movements to be performed.

• are a group of bones found inside
the middle ear.
• There are three ossicles. These
are the hammer, anvil, and
stirrup.
• The ossicles are the smallest
bones in the body that vibrate to
amplify sound to allow better
hearing

• A bone is a special form of
connective tissue made up of a
special protein material called
COLLAGEN - which is saturated
with calcium.
• Compact bone is solid and
dense, and it forms the outer
shell of the bone.
• Spongy bone is less dense than
compact bone and is made up of
thin threads of bones.

• Calcium is a stone-like mineral
that makes your bones strong.
• It is the reason why bones
appear white on X rays. It is also
the same material that makes
teeth hard enough to chew food.
• Calcium allows bones to respond
to the stress and strain you put
on them.
• It is found in foods like cheese
and milk.

• When calcium enters your body,
99% of it goes to your bones for
storage.
• When these organs need
calcium, they absorb the calcium
deposits inside the bones.
• Bone Resorption is
resorption of bone tissue, that
is, the process by which
osteoclasts break down the
tissue in bones and release the
minerals, resulting in a transfer of
calcium from bone tissue to the
blood.

• Bones are VASCULARIZED. This means
that they have a rich blood supply.
• In adults, human blood flows through the
bones at an average of 200 to 400 milliliters
(mL) per minute.

• Most bones start out as CARTILAGE.
Cartilage is a whitish fibrous material that is
both tough and strong but contains a lot of
water.
• As you grow older, the cartilage ossifies.
OSSIFICATION is the process of hardening
due to the deposition of minerals, especially
calcium.
– Adults have stronger bones than children because
their bones are already much more ossified..

• The EPIPHYSIS, the end part
of a long bone, initially growing
separately from the shaft.
• the areas where bone growth
happens. The elongation of
your bones allows you to
become taller.
BONE MARROW a soft fatty substance in the cavities of bones, in which
blood cells are produced (often taken as typifying strength and vitality).

1. calcium a. process of calcium deposition
2. 200 to 400 mL b. having a rich blood supply
3. epiphyses c. sites of bone growth
4. collagen d. whitish fibrous material
5. bone marrow e. mineral stored in bones
6. ossification f. nutrient found in meat and fish
7. protein g. important for blood production
8. cartilage h. protein material that makes up a
bone
9. vascularized i. average amount of blood that
flows through the bones per minute
10. bone resorption j. bone destruction

 a break in a bone.
 Some fractures are closed, some are open.
 CLOSED FRACTURES are broken bones with unbroken skin.
 OPEN FRACTURES have broken skin, usually with the bone coming
out of the site of injury. Open fractures are worse because they are
more prone to infection and indicate a larger amount of damage to the
bone.
 Fractures are most often caused by traumatic accidents and bad falls.

1. When a person suffers a traumatic accident or a bad fall, it is
best to assume that a bone is broken.
2. When a fracture is present, there is usually swelling of the
fractured area and the patient is unable to move the affected
body part. Fractures are most often painful and the patient
might cry in agony.
3. When the affected area is an extremity like a leg or an arm,
check the area. If there is an open wound (usually with a
protruding bone part) call for help immediately. You may ask
someone else to call for help while you attend to the patient.
4. Control bleeding by putting a direct, steady pressure on the
area using a cloth or any dampening material. Never attempt
to put back the bone to its original position by pushing or
pulling it. Other structures like the muscles, nerves, and blood
vessels might be damaged. This might cause more harm than
good.

5. The most important thing to do for any type of fracture is to
immobilize the affected area. IMMOBILIZATION means
limiting movement and hence avoiding further damage.
6. While the patient is immobilized, call for help. Stay with the
patient. Make him/her as comfortable as possible with the
least amount of movement.

7. If a closed fracture is noted, the same procedure is followed.
Again, remember the important principles in management of
fractures, namely immobilization and immediate referral for
medical attention.
8. Even if the affected area is movable and there is very minimal
pain, it is still advisable to seek medical attention. Some
fractures are small in scale and are only detected through X
rays. It is best not to rule out any body injury in traumatic
events.
9. The principle of immobilization is more important when a neck
fracture is suspected. This is most common after a bad fall
from a high position. Never attempt to move the patient. Neck
fractures are potentially life threatening. Seek medical
attention immediately. While waiting for help, you can ensure
immobilization by doing a makeshift cervical collar using two
bottles or any other similar hard objects and placing them on
each side of the patient’s neck.

 can be called roundback or Kelso's hunchback.
 a condition caused by too much outward curvature of
the vertebral bones. This makes it difficult for the
person to move fast.

 Too much sideward movement of the same
bones would also lead to a deformity.

 caused by vitamin D deficiency, especially in children. Vitamin D is
important in the deposition of calcium inside the matrix or inner structure
of bones to provide bone strength.
 Persons with rickets have very weak bones because of low calcium
content. A lot of them are bow-legged and weak. They can only do very
limited movements.

 A true dwarf. have proportional body
structures but are very small. They
are usually 3 feet or below in height.

 have normal-sized bodies but they have
very short arms and legs.
 Both conditions are GENETIC AND
INBORN, and they have no known cure.

 Inflammation of the joints.
 More common among the elderly.
 Joints are inflamed because of the abrasion of the joint
linings due to old age or constant physical exertions.
People with arthritis usually complain of very painful and
sometimes swollen joints.
 Painkillers are the first line of treatment.

 very common in old women.
 It is the loss of bone minerals that lead to brittle, easily
fractured bones.
 This condition is very common among post-menopausal
women due to lack of estrogen, a hormone that inhibits
bone resorption.
 Patients are treated with calcium supplementation, hormone
replacement, and physical therapy.

 Results from the overstretching of the ligaments that connect
bones.
 Ligaments are stretched too much when an extreme motion
is abruptly performed like reaching too far for an object or
twisting an ankle.

Eat a lot of food rich in calcium such as milk and dairy products.

Eat a lot of protein-rich foods such as soya beans,
vegetables, meat, and fish.

 Avoid activities that may cause
traumatic body injuries and bad
falls such as climbing on top of
an unstable furniture.

 Always wear or use protective
gear when a traumatic injury or
fall is likely to happen, such as
in motorcycling.

 Properly arrange furniture and
other equipment around you to
avoid accidents.
 Keep things orderly. Playthings
left on the stairs might cause
accidents.

 Keep floors dry to avoid slipping

 Rest regularly. Avoid too much strain on
your bones and joints.

 Lift objects properly. Avoid bending
forward when carrying a heavy load.

 Always seek medical help when a bone
injury is likely to have occurred.

Identify what is being described by each phrase.
1. broken bone
2–3. two important principles in handling fractures
4. common bone defect in old women
5. also known as a midget
6. hormone that inhibits bone resorption and thus prevents
osteoporosis
7. vitamin that can prevent rickets
8. inflammation of the joints
9. two most important food nutrients for the skeletal system
10. large piece of cloth used to immobilize an arm

_____ 1. The skeletal system is made up of bones.
_____ 2. Bones are hard because of the calcium deposited inside.
_____ 3. Bones provide the framework of the body.
_____ 4. Bones usually start as cartilage.
_____ 5. Bone growth occurs in the epiphyses.
_____ 6. All bones in the body have the same name.
_____ 7. A break in the bone is called a sprain.
_____ 8. Broken bones should be moved constantly.
_____ 9. A sling is made of wood only.
_____ 10. Protein and calcium should be included in your diet to keep your
bones strong.
_____ 11. Scoliosis is a backward curvature of the spine.
_____ 12. The spine is also called humerus.
_____ 13. Injuries can be avoided by wearing protective gear.
_____ 14. Running is an example of a gross motor movement.
_____ 15. All bones look the same.

LS 2 4 The Skeletal System

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