Cells in your body have specific functions (jobs). Fat Cell Nerve Cell White Blood Cell Red Blood Cell Muscle Cell Platelet Bone Cell Cells with similar functions working together form a TISSUE. Muscle Tissue Nerve Tissue Adipose Tissue (fat tissue) Blood Bone Tissue Cuboidal cells EPITHELIAL TISSUE (3 types) Lining of glands, kidneys tubules, ducts of glands Squamous cells Lining of lungs, heart, mouth, blood vessels, and skin. Columnar cells Lining of stomach, intestines, nose, ears, and tongue CONNECTIVE TISSUE adipose tissue (fat cells) cartilage (chondroblast cells) blood (platelets, red and white blood cells) bone (osteoblast cells) adipose cartilage blood bone NERVOUS TISSUE •Brain •Spinal Cord •Nerves Muscle Tissue Smooth Muscle Tissue Skeletal Muscle Tissue Cardiac Muscle Tissue SMOOTH MUSCLE Found in blood vessels, stomach, intestine, esophagus, •Not striated •Involuntary •Not branched •Slow to tire SKELETAL MUSCLE attaches to and moves bones. •Striated •Voluntary •Not branched •Tires when working hard CARDIAC MUSCLE Found only in the heart. •Striated •Involuntary •Branched •Never tires Two or more tissues working together make up an ORGAN. Organs working together make up an ORGAN SYSTEM. Homeostasis is the state of having a stable internal environment. OBJECTIVES •Discuss the functions of the skeletal system. •Describe the structure of a bone. FUNCTIONS OF THE SKELETAL SYSTEM •Provides shape and support •Allows movement •Protects vital organs and tissues •Stores certain materials •Produces blood cells 206 bones make up the skeleton. The Skeletal System is the body’s living framework. Most of the skeletal system is made up of bones, ligaments, tendons, and cartilage (connective tissues). The skeleton is divided into two parts. •Axial skeleton •Appendicular skeleton Axial Skeleton Appendicular Skeleton skull ribs shoulders breastbone arms vertebral column and hands pelvis/hips legs and feet Axial Skeleton Protects the Organs. Appendicular Skeleton Provides Movement Development of Bone Structure of Long Bone Figure 6.3a, c Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Structure of Long Bone Figure 6.3a,b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Microscopic Structure of Bone: Compact Bone Figure 6.5a, b Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings Ball and Socket A ball and socket joint allows for radial movement in almost any direction. They are found in the hips and shoulders. Hinge A hinge joint allows extension and retraction of an appendage. Injuries to the skeletal and muscular systems. •Sprain – ligaments and tendons are torn or pulled beyond their stretching range. •Fracture – a break in the bone. •Dislocation – when a bone is forced out of its joint. The End!