WARMUP: 4 Interesting Facts about the Skeletal System

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WARMUP 4 Interesting Facts about the Skeletal
System

• 20 of your body weight is bone. On your own
  paper, do the math
• (Your body weight) X 0.20
• You have 206 bones. More than
• ½ of these are in your hands and feet.
• How many bones is that?
• There are 30 bones in your skull.
• Your largest bone is your femur and
• your smallest bone is in your ear!

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Skeletal System

• Its all about the bones!!!

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2. Functions of the Skeletal System

• Provides shape and support
• Protects internal organs
• Enables you to move (works with muscles)
• Produces blood cells
• Stores materials for future use (HOMEOSTASIS
  ALERT!)

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3. Shape and Support

• Skeletal system provides shape and support for
  body
• Shape depends on the organ or organ system it
  needs to protect
• Example
• Your skull is thick and round to cover your
  brain!

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4. Protects Internal Organs

• Skeletal System protects your internal organs
• Organs can be easily squished
• Example
• Heart and breastbone
• Spinal cord and spine
• Lungs and rib cage

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5. Enables you to move

• Muscles work with bones to make you move

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6. Produces Blood Cells

• Bones produce substances our body need
• Blood cells (white and red) made in the marrow of
  the long bones of the arms and legs

Bone Marrow
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7. Stores Materials for Future Use

• Stores substances until your body needs them
• Stores calcium and phosphorus
• Homeostasis alert!
• Bones release small amounts of calcium and
  phosphorus into your body when needed!

Compact bone where blood vessels are and
minerals are stored
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8. Joints of the Skeletal System

• The bones of the skeletal system are connected at
  areas called joints
• Where two or more bones come together
• The body has moveable and
• immoveable joints

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9. Immovable Joints

• Joints in the body where there is little or no
  movements
• Examples
• Skull
• Ribs

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10. Movable Joints

• Joints that allow movement.
• Most of the joints in the body are movable.
• There are 4 types of
• movable joints
• Ball and Socket
• Pivot
• Hinge
• Gliding

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11. Movable Joints of the Skeletal System

• Ball and Socket Joints
• Allows fullest range of motion
• Examples shoulder and hip

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12. Movable Joints of the Skeletal System

• Pivot Joints
• Allows one bones to rotate around another
• Example neck vertebrae

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13. Movable Joints of the Skeletal System

• Hinge Joints
• Allows forward and backward motion
• Example knee and elbow

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14. Movable Joints of the Skeletal System

• Gliding Joints
• Allows one bone to slide over another
• Example wrist and ankle

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15. Joints of the Skeletal System

• Bones in movable joints are held together by
  strong connective tissue called ligaments.

Ligaments are like the tape that hold bones
together.
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Homeostasis Summary

• The body must constantly produce and replace new
  red and white blood cells.
• The process of releasing and storing calcium goes
  on almost continuously to regulate balance within
  the body.

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CPS Quiz

• Skeletal System

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1. What is a place in the body called where two
bones come together?

1. Connections
2. Hinge
3. Joint

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2. Which type of joint allows the bone to swing
in a full circle?

• Hinge
• Ball and
• socket

1. Pivot
2. Gliding

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• 3. Do bones make blood
• cells?
• A. Yes
• B. No

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• 4. What is the name of the tissue that holds
  bones together at a joint?

• A. Cartilage
• B. Tendon
• C. Ligament

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• 5. What do your bones store (but not produce)
  that your body needs?
• Phosphorus
• White blood cells
• Red blood cells