Muscular & Skeletal Systems http://commons.wikimedia.org/wiki/File:Skeletal_System.png http://commons.wikimedia.org/wiki/File:Muscular_system.svg

Muscular System Muscles are the organs that move body parts. Bones and joints have no power to move on their own. More than 600 muscles in the body 35–40% of body mass is muscle http://commons.wikimedia.org/wiki/File:Souplesse_exercice_du_tendon_d%27Achille.png

Muscular System Muscle—organ that contracts and becomes shorter or expands and becomes longer Result = Body parts move, energy is used, and work is done. http://commons.wikimedia.org/wiki/File:Bicep_tricep.gif

Muscular System Two Groups of Muscles Voluntary—You can control these. Arms, legs, hands, face 2. Involuntary—You can’t control these; you don’t have to decide to make these muscles work. Muscles around the heart http://commons.wikimedia.org/wiki/File:Baby_teeth_in_human_infant.jpg http://commons.wikimedia.org/wiki/File:Heart_normal.svg

Muscular System Three Types of Muscle Tissue 1. Skeletal Muscle Most numerous in body Looks striped (striated) Attached to the bones by tendons Tendons—thick bands that pull on the bone as the muscle contracts Voluntary Contract quickly, tire easily http://commons.wikimedia.org/wiki/File:Skeletal_muscle_-_longitudinal_section.jpg http://commons.wikimedia.org/wiki/File:Calcaneal_tendon.jpg

Muscular System Three Types of Muscle Tissue (cont.) 2. Smooth Muscle Involuntary Found in: walls of stomach, intestine, uterus, etc. Contracts and relaxes slowly No striations http://commons.wikimedia.org/wiki/File:Stomach.png http://commons.wikimedia.org/wiki/File:Glatte_Muskelzellen.jpg

Muscular System Three Types of Muscle Tissue (cont.) 3. Cardiac Muscle Only found in heart Involuntary Has striations Contracts 70 times per minute (heartbeat) http://commons.wikimedia.org/wiki/File:Cardiac_muscle_histology.jpg http://commons.wikimedia.org/wiki/File:Heart_systole.svg

Muscles at Work Skeletal muscle movements are results of pairs of muscles working together. One muscle contracts while the other muscle relaxes. Muscles always pull; they never push. http://commons.wikimedia.org/wiki/File:Bicep_tricep.gif

Muscles at Work Results of Muscle Action Muscles contract This produces thermal energy, and it uses chemical energy. Thermal energy produces heat that helps keep body temperature constant. Chemical energy is from glucose. (When glucose is used up, muscles are tired and need to rest.)

Muscles at Work Results of Muscle action (cont.) Over time, muscles become larger or smaller, depending on how much work they do. http://commons.wikimedia.org/wiki/File:RIAN_archive_103479_Soviet_weight-lifter_Viktor_Mazin_during_the_XXII_Olympic_Games.jpg

Skeletal System Made up of all of the bones in your body, it is the framework of the body. Each bone in your body is a living organ, made of different tissues. Cells in bones take in food and use energy. http://commons.wikimedia.org/wiki/File:Human_skeleton_front_en.svg

Skeletal System Made up of all of the bones in your body, it is the framework of the body. - Five Functions of Skeletal System 1. Framework gives shape & support to the body. http://commons.wikimedia.org/wiki/File:Skeleton_diagram.svg

Skeletal System Made up of all of the bones in your body, it is the framework of the body. Five Functions of Skeletal System 1. Framework gives shape and support to the body. 2. Bones protect the internal organs. http://commons.wikimedia.org/wiki/File:Rib_cage.gif

Skeletal System Made up of all of the bones in your body, it is the framework of the body. Five Functions of Skeletal System 1. Framework gives shape & support to the body. 2. Bones protect the internal organs. 3. Major muscles of the body are attached to the bones. http://commons.wikimedia.org/wiki/File:Tendon_(PSF).png

Skeletal System Made up of all of the bones in your body, it is the framework of the body. Five Functions of Skeletal System 1. Framework gives shape & support to the body. 2. Bones protect the internal organs. 3. Major muscles of the body are attached to the bones. 4. Blood cells are formed in red marrow of some bones. http://commons.wikimedia.org/wiki/File:Right_arm_bone_marrow.svg http://commons.wikimedia.org/wiki/File:Bone_marrow_WBC.JPG

Skeletal System Made up of all of the bones in your body, it is the framework of the body. Five Functions of Skeletal System 1. Framework gives shape & support to the body. 2. Bones protect the internal organs. 3. Major muscles of the body are attached to the bones. 4. Blood cells are formed in red marrow of some bones. 5. Skeleton is a place where major quantities of calcium and phosphorus compounds are stored. http://commons.wikimedia.org/wiki/File:Tilsit_cheese.jpg

Bones The adult skeleton has 206 bones (baby has 270). http://commons.wikimedia.org/wiki/File:Human_baby.JPG http://commons.wikimedia.org/wiki/File:Human_skeleton_front_en.svg

Joints Any place where two or more bones meet Ligaments: tough bands of tissue that hold bones together at the joints http://commons.wikimedia.org/wiki/File:Ligament_crois%C3%A9_post%C3%A9rieur.png