Transcript Slide 1
Homeostasis Process by which an organism’s internal environment is kept stable in spite of changes in the environment. skeletal systemmade of bones which are organs that grow and develop. Functions of the skeletal system • • • • Provides shape and support. Enables you to move. Produces blood cells. Stores minerals and other materials until your body needs them. • Protects your organs. Muscular System- Works with the skeletal system to help you move. Types of Muscle • Skeletal- Attached to bone Voluntary • Smooth- Inside organs Involuntary • Cardiac- Found in your heart Involuntary Muscles • Voluntary- Under your control • Involuntary- Not under your control Example- muscles attached to your bones Example- muscles in your organs • Muscle cells can only contract not extend. • Muscles work in pairs. When one muscle contracts the other relaxes to its original length, Skin Has two layers: Dermis and Epidermis Functions: • Protects the body. • Maintains Temperature. • Eliminates Waste. • Gathers information. • Produces vitamin D Nutrients • Carbohydrates- Provide Energy • Fats- Provide Energy • Protein- Needed for tissue growth and repair. • Vitamins and Minerals-Needed for chemical reactions. • Water- Vital processes take place in water. Vocabulary Using your textbook, define the following words: Digestion Absorption Mechanical Digestion Chemical Digestion Peristalsis Enzyme Digestive System Functions: • Breaks down food into molecules the body can use. • Absorbs nutrients into the blood. • Eliminates Waste. Organs and functions of the digestive system • MouthMechanical digestion- Teeth grind food. Chemical digestion- saliva breaks down food. • Esophagus- Muscular tube that connects the mouth to the stomach. • Stomach Mechanical digestion- churning motion Chemical digestion- chemicals and acid breaks down and digest protein in food. Organs and functions of the digestive system • Small intestine- Most of the chemical digestion and absorption (villi) occurs. • Large Intestine-Water is absorbed and waste is discarded. • Liver- Produces bile • Gallbladder- Stores bile and releases it into the small intestine. • Pancreas- Produces enzymes and releases them into the small intestine.