Section 11.1 Your Skeletal System

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Objectives

Identify the five main roles of the skeletalsystem.

Section 11.1 Your Skeletal System

Explain how you can keep your skeletal system healthy.

Section 11.1 Your Skeletal System

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Your skeletal system has five main roles.

Functions of the Skeletal System

• provides support

• protects internal organs

• allows your body to move

• stores and produces materials that your body needs

Section 11.1 Your Skeletal System

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• Your skeleton is made up of all the bones inyour body.

Support and Protection

• *Your skeleton gives your body its basic shape and provides the support that you need.

• *Many bones of the skeletal system protect internal organs.

Section 11.1 Your Skeletal System

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*In coordination with your muscular and nervous systems, your skeletal system allows you to move.

Movement

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• *Your bones store essential substances which are released when other parts of the body need them.

Storage and Production of Materials

• *Some bones also produce blood cells.

Section 11.1 Your Skeletal System

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The Skeletal System

1) Sternum (breastbone)

2) Vertebral column (backbone)

3) Carpals

4) Metacarpals

5) Phalanges

6) Tarsals

7) Metatarsals

8) Phalanges

9) Clavicle (collarbone)

10) Scapula (shoulder blade)

11) Humerus

12) Ribs

13) Radius

14) Ulna

15) Pelvic girdle

16) Femur

17) Patella

18) Fibula

19) Tibia

Skull

Section 11.1 Your Skeletal System

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• Your bones are living structures that undergo change throughout your life.

Development of Bones

• Cartilage is a tough supportive tissue that is softer and more flexible than bone.

• By young adulthood, most of this cartilage is replaced by bone in a process called ossification (ahs uh fih KAY shun).

• In a process called ossification minerals, such as calcium and phosphorus, are deposited within the cartilage, making it hard.

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• Bone consists of two different types of tissue—compact bone and spongy bone.

Structure of Bones

• Another type of tissue called marrow fills the spaces in bones.

• *There are two types of marrow—red and yellow.• Red Makes Red Blood Cells • Yellow stores fat cells

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• Adequate intake of calcium and phosphorus will help your bones grow to their maximum size and strength.

Eating Well

• *Osteoporosis is a condition in which the bones become weak and break easily.

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• *Another way to build strong bones and prevent osteoporosis is to get plenty of weight-bearing exercise.

Exercising

• *Activities in which the bones support the entire weight of your body help your bones grow strong and dense.

Calcium RDA (Recommended Daily Amount)

Section 11.1 Your Skeletal System

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Medical Conditions of the Spine

• *Scoliosis (skoh lee OH sis), an abnormal curvature of the spine.

• *Lordosis, an abnormal arch in the lower back (lumbar)

• i.e. Swayback• *Kyphosis, a posture problem characterized by

rounded shoulders and sunken chest

Section 11.1 Your Skeletal System

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1

2

345

67

8

910

1112

13

1415

16

1718

19

The Skeletal System

1) Sternum (breastbone)

2) Vertebral column (backbone)

3) Carpals

4) Metacarpals

5) Phalanges

6) Tarsals

7) Metatarsals

8) Phalanges

9) Clavicle (collarbone)

10) Scapula (shoulder blade)

11) Humerus

12) Ribs

13) Radius

14) Ulna

15) Pelvic girdle

16) Femur

17) Patella

18) Fibula

19) Tibia

Skull

Section 11.1 Your Skeletal System

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