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The Human Skeletal System - 7th Grade

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William Begoyan

on 16 March 2017

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Transcript of The Human Skeletal System - 7th Grade

AVID: What do your bones do for you?
Functions of Bones
Bones (skeleton)
Joints
Cartilage
Ligaments
Support
of the body
Protection
of soft organs
Movement
due to attached skeletal muscles
Storage
of minerals (like calcium) and fats
Blood
cell formation
Bones of the Human Body
-Bones connect to other bones through joints.
-Joints are usually surrounded by cartilage and ligaments.
The Human
Skeletal System

Goes on page 41 in your ISN
Parts of the skeletal system
Joints
Fibrous tissue, harder than cartilage.
Helps connect and hold most bones to each other.

Where can you find cartilage on your body?
Types of Bone Cells
Osteocytes
Mature bone cells
Osteoblasts
Bone-forming cells
Osteoclasts
Bone-destroying cells
Bone marrow
Located inside the spongy part of our larger bones.
Produces all of your
red blood cells
, and most of our
white blood cells
.
The skeleton has 206 bones.
Two basic types of bone tissue.

Compact /Cortical bone
Outer layer (shell) of the bone. Very hard, very dense.
Spongy/Trabecular bone
Inner layer of the bone, not very dense, lots of empty space. In certain bones, this is where blood is manufactured.
Cartilage
Soft connective tissue made of collagen fiber.
As an embryo, our entire skeleton was made of cartilage, most of which was replaced with bone.
In mature humans, cartilage is found near and around bones.
You can find cartilage in your nose and ears.
Ligaments
List some functions of our bones
What are the parts of the skeletal system?
What are the two types of bone tissue?
Types of Joints
There are 6 types of joints
Hinge Joints
allow bone to move back and forth (fingers, elbows, knees)
Saddle Joints
allow bone to move back and forth and side to side (Thumb)
Ball-and-Socket Joints
allow bone to rotate almost freely (hips and shoulders)
Pivot Joints
allow bones to rotate, but not as well as Ball-and-Socket (neck)
Gliding Joints
allow bones to move side to side or front to back (ankles and wrists)
Immovable Joints
very little to no movement (skull)
Levers
Levers allow you to do more work using less force/power
A lot of our joints form natural levers, allowing our bodies to do more and perform efficiently.
What are joints for?
What are the different types of joints?
Why do we need levers in our body?
What are ligaments for?
What are bone cells called?
What are bone forming cells called?
What are bone destroying cells called?
Why do we need bone marrow?
Homework
On page 40 use the provided model (or draw your own!) of the human skeleton, than label the largest bones and bone groups (20 labels)
The process of bone creation is called
Osteogensis
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