2 Levels of Organization Section 7- 4Muscle cellmuscle tissueOrganOrgan systemThese Organ Systems function together to maintain homeostasis – a stable internal environmentGo to Section:
3 The Integumentary System A. Major OrgansSkinHairNailsB. Major FunctionsProtection – keeps moisture in and pathogens outSensory input – nerves in skin allow you to sense your environmentTemperature regulation – sweat produced by glands in the skin cool the bodyWaste removal – chemicals can be removed along with sweat
4 Muscular SystemSmooth Muscles- involuntary muscle that moves food through the digestive tract and controls blood flow.Skeletal Muscles-Work together with bones to provide movement for the body.Cardiac Muscle- Only found in the heart
5 Skeletal System Major Functions: Protection Support Mineral Storage Works with muscles to provide movement
6 Nervous System Major Function: To control all activities of the body Neurons- Nerve cells that transport signalsMajor organs:- Central Nervous System- Brain and Spinal Cord-Peripheral Nervous System- Nerves that relay messages between the CNS and the rest of your body
8 Digestive SystemMajor Function: To break down food (mechanically and chemically) into molecules that the body can use.Organs:Mouth- mechanical and chemical digestion takes placeEsophagus- tube leading to stomachStomach- Mechanical and chemical digestionSmall Intestines- Chemical digestion and absorbs Nutrients into blood streamLarge Intestines- Absorbs water into blood stream
10 Respiratory SystemMajor Functuion- To supply the cells of the body with oxygen and get rid of carbon dioxide wastesMajor organs:Trachea- tube that leads to the lungsLungs- cavities that hold oxygen or carbon dioxide wastesAlveoli- sacs inside lungs where gas exchange takes place.Diaphragm- relaxes and contracts to draw oxygen into the lungs and expell carbondioxide out of the lungs.
12 Urinary System Filters harmful poisons from the body Kidneys- filters the blood of harmful wastes
13 Circulatory SystemTransports material to and from the cells in the body.Organs-Blood- transports nutrients, oxygen and cellular wastes throughout the body using red blood cellsHeart- Pumps blood through the vessels in the bodyBlood Vessels- Transport systemVeins transport blood to heartArteries transport blood away from the heartCapillaries- the exchange site at cells
14 Circulatory System Major Transport System of nutrients and wastes to and from every cell in the body.
15 Reproductive SystemTo enable organisms to carry on life by producing offspring.Meiosis- The production of sex cells (gametes) which are haploid cellsFemale gamete- EggsMale gamete- SpermALLOWS FOR GENETIC VARIATION!!!