Human Body Systems and Health Chapter 1 Section 2 The Human Skeletal System

The Skeletal System—Bones, cartilage, and the connective tissue that holds bones together.

Bones are hard…but they are made of living tissue! Bones help your body maintain homeostasis by storing minerals and making blood cells for when your body needs them.

Your Skeleton Has Specific Jobs Protection — for example, ribs protect your heart and lungs Storage— bones store minerals and fat Movement— muscles pull on bones so your body can move Blood Cells—blood Makes cells are made in the center of some bones

Structure of Bone Cartilage Blood Vessels

Facts About Bone Structure Bone is a living organ—that’s right, a living organ! Bone is made of connective tissue and minerals Special living cells called osteoblasts (AHS tee oh blasts) deposit (put) the minerals in the bone cells

More Bone Facts… Compact Bone—very dense Spongy Bone —has air pockets; very strong Marrow—center of bone Red Marrow—makes red and white blood cells Yellow Marrow—stores fat for energy

Which Kind of Bone Tissue is Hard and Compact? Compact Bone Spongy Bone Marrow Marrow

No! The Answer is Compact Bone! Continue No! The Answer is Compact Bone!

Correct!

What Type of Bone Makes Blood Cells and Stores Fat? Compact Bone Spongy Bone Marrow Marrow

Continue No! The Answer is Marrow!

Correct!

How Do Bones Grow? Bones start out soft, as cartilage As babies grow bigger their cartilage turns into bone Our ears and our nose are examples of cartilage tissue They are both flexible

Three Main Kinds of Moving Joints Gliding Ball and Socket Hinge Three Main Kinds of Moving Joints

Some Joints Don’t Move Fortunately!

Human Joint Animations

Skeletal Injuries Fracture—a break in a bone Dislocation—a bone forced out of location or place Sprain—abnormal stretching or tearing of a ligament (remember, ligaments hold muscles onto bones)

Skeletal Injuries and Diseases Fracture Skeletal Injuries and Diseases Fracture—a break in a bone Dislocation—a bone forced out of location or place Sprain—abnormal stretching or tearing of a ligament (remember, ligaments hold muscles onto bones)

Skeletal Injuries and Diseases Fracture Skeletal Injuries and Diseases Fracture—a break in a bone Dislocation—a bone forced out of location or place Sprain—abnormal stretching or tearing of a ligament (remember, ligaments hold muscles onto bones)

Skeletal Injuries and Diseases Sprain Fracture Skeletal Injuries and Diseases Fracture—a break in a bone Dislocation—a bone forced out of location or place Sprain—abnormal stretching or tearing of a ligament (remember, ligaments hold muscles onto bones)

Skeletal Diseases Osteoporosis—bones become less dense and more weak causing bones to break easily Arthritis—swelling and stiffening of joints causing pain and reduced flexibility

Skeletal Diseases Osteoporosis—bones become less dense and more weak causing bones to break easily Arthritis—swelling and stiffening of joints causing pain and reduced flexibility

Skeletal Diseases Osteoporosis—bones become less dense and more weak causing bones to break easily Arthritis—swelling and stiffening of joints causing pain and reduced flexibility

One Of Our Favorite Skeletons

Section Review Questions Which of the following is NOT an organ of the skeletal system? Bone Cartilage Muscle None of the above

Section Review Questions What are the four functions of bones?

Section Review Questions What are the three kinds of moveable joints?

Section Review Questions Describe two diseases that affect the skeletal system

The End