Presentation on theme: "The Skeletal System LEQ: How does the skeletal system provide support and protection to the human body?"— Presentation transcript:
1The Skeletal SystemLEQ: How does the skeletal system provide support and protection to the human body?
2Activity Page 14B How can a bone act as a lever? What do you think? At which position is it the easiest to move the bag?At which position does the bag move the farthest?How does the position of a load affect the action of a lever?
3Bones are living tissue The Skeletal system is made up of connective tissue called bone.Serves as an anchor for all of the body’s movement, provides support, and protects soft organs inside the body.Bones are classified as long, short, irregular, and flat.
8Types of bone tissueCompact BoneSpongy BoneThe hard compact bone tissue surrounds the spongy tissue.Strong but lightweight tissue inside the bone. The calcium network is less dense.
9Bone parts1- Compact Bone – dense, gives bone strength and support body.2- Spongy Bone – less dense and lightweight.3- Bone Marrow- produces blood cells.4- Blood Vessels- nourishes the bone and carries waste away.
10Think-pair-shareHow is the compact bone able to give the bone strength?How does bone receive nourishment?Where are red blood cells formed?
11The Skeleton is the body’s framework The provides the body’s shape.It also works with other systems to allow movement.It has two main divisions:The axial SkeletonThe appendicular Skeleton
12The Axial Skeleton Is the central part (the axis) of the skeleton. Sitting, standing, and twisting are some of the motions that turn around the axis.It includes the skull or the cranium (do not move), spinal column (made of many bones called vertebrae), and the rib bones.
13The Appendicular Skeleton Allowing movement is the main function.The shoulder belongs to the upper part of the appendicular skeleton.The lower part of the appendicular skeleton includes the legs and hip bone (support the body’s weight)
14How are the axial and appendicular skeleton alike and different? Axial SkeletonAppendicular Skeleton1- Attached to the axial skeleton2- Includes bones of the shoulders, hips, arms, and legs3- Main function is to allow movement1- Central part of the skeleton2- Includes the skull, spinal cord, and ribs3- Main function is to provide support and protection1- Made up of bones2- Provides body’s shape.
15The skeleton changes as the body develops and ages Infancy – skull made up of bones with spaces between them. As the brain grown the skull also grows until the spaces close.Childhood- The growth occur in places called growth plates (made of firm but flexible connective tissue, cartilage) The length and shape of the bones is determined by them.
16The skeleton changes as the body develops and ages Adolescence – at the end of this stage bones stop growing. The growth plate hardens, and the skull plates fuse.Adulthood – bones do not grow, some bone breaks and new bone grows. As people age the bone density decreases.
17Joints connect parts of the skeletal system A joint is a place where two parts of the skeletal system meet.There are three types of joints:ImmovableSlightly movableFreely movable
18Immovable and slightly movable joints An immovable joint locks bones together like puzzle pieces.The bones of your skull are connected by immovable joints.Slightly movable joints are able to flex slightly.Your ribs are connected to your sternum by slightly movable joints.
19Freely movable joints Allow your body to move and bend. Tissues called ligaments hold the bones together at these joints.Other structures inside the joint cushions the bones and keep them from rubbing together.The entire join is also surrounded by connective tissue.
20Freely movable jointsMovable joints can be classified by the type of movement they produce.Angular movement – arm moves up, down, changing angle between your upper and lower arm. (hinge joint)Rotational movement – arm rotates from side to side, like a doorknob. (pivot joint)
21Freely movable jointsBall and socket joint – rotational movement of the arm around in a circle.Gliding movement – one bone slides back and forth across another, like in your backbone (the only movement this joint produces)
22Activity page 19BHow was the motion you felt similar for each activity?Based on your observations, identify two more ways that joints move.Finish the challenge on a separate sheet and turn in for extra credit!!!!
23ChallengeThe joints in your hand and wrist produce three different types of movement. Using your own wrist, classify the joint movement of the finger, palm, and wrist. Support your answer.
24Important review questions What are the functions of the two types of bones?What are the main divisions of the human skeleton?Name three types of movement produced by movable joints and give an example of each.
25Important review questions What function do immovable joints in the skull perform? Think about the different stages of development in the human body.Which type of movable joint allows the most movement? How does the joint’s shape and structure contribute to this?