THE SKELETAL SYSTEM

dEFINITION Skeletal System - A body system consisting of bones and the tissues connecting them.

Quick Bones facts Your bones are the supports of your entire body. They allow you to stand and to move. Your bones are made up of living tissues and cells. Bones are hard on the outside, and spongy on the inside There are 206 separate bones in the adult human body The femur is the largest bone. The smallest bones are located in the ear (stirrup).

Types of bones There are five different types of bones. Long Short Flat Irregular Sesamoid

Long Bones that are much longer than wide. Mostly in limbs (arms & legs) Examples: Femur Ulna Radius Fibia

short Short and “cube” shaped. Found mostly in the wrist and ankles Example: Patella

flat Flat bones are thin and often curved in shape Examples: Skull Sternum

Irregular Bones that do not fit into any of the previous categories Examples: Spine Pelvis

sesamoid Bones that are surrounded by tendons. Act to keep the tendon away from the joint. Examples: Patella Pisiform (wrist)

joints Joints – places where one bone meets another. There are four major different types of joints Pivot Hinge Ball and Socket Gliding

Pivot Pivot joints consist of one bone rotating inside a ring created by the other bone. This joint can move up and down and from side to side. Example: Neck

Hinge This joint moves only in one direction like a door hinge. Examples: Elbow Knee

Ball and Socket The round end of one bone moves inside the other bone’s cup-shaped opening. Can move in all directions Examples: Hip Shoulder

Gliding Allow one bone to slide over another. Move in a back and forth motion Examples: Wrist Ankles

Bones of the core Skull Mandible Ribs Vertebrae Pelvis Scapula Clavicle

Bones of the arms Humerus Radius Ulna Carpals Metacarpals Phalanges

Bones of the legs Femur Patella Tarsals Tibia Fibula Metatarsals

BROCCOLI 50 MG

CHEDDAR CHEESE 200 MG

YOGURT 370 MG

MILK 300 mg

TOFU 860 MG

Calcium Calcium is the major mineral found in our bones. Calcium builds the hard structure of bones making them strong. Teens needs roughly 1300 mg of calcium daily.

Bone health psa For Monday, you will create a public service announcement on bone health. You may either create a poster, write a paper, or create a video. The specific guidelines for each choice are outlined in the rubric you will pick up after the quiz.