2 Skeletal System Functions: Provides shape & support Helps you move Protects organsProduces blood cellsStores certain materialsMinerals & fatBrainPop video clip: Skeletal System
3 Skeletal System Protects internal organs: Produces substances: Skull … protects the brainRibs … protect the heart & lungsVertebrae … protects the spinal cordProduces substances:Femur … produces blood cells in the legHumerus … produces blood cells in the arm
4 Endocrine SystemThe endocrine system is a system of glands, each of which secretes hormones into the blood stream to regulate the body.Endocrine glands are shown to the right.
5 Insulin and GlucagonThe Pancreas releases insulin to stimulate uptake of glucose from blood. Lowers Blood Sugar Level.The pancreas also secretes glucagon which stimulates breakdown of glycogen to glucose in liver. Raises Sugar level.
6 Muscular System Some functions: Helps the body move Moves food through the digestive systemKeeps the heart beatingBrainPop Video Clip – Muscular System
7 Muscle Action Involuntary muscle Voluntary muscles Muscles not under your conscious controlEx: muscles used for breathing & digesting foodVoluntary musclesMuscles that are under your conscious controlEx: Smiling, turning the pages in a book, walking to class
8 3 Types of Muscle Tissue Skeletal Smooth Cardiac Attached to bones & move bones using tendonsConnective tissue attaching muscles to bonesStriated, or bandedVoluntarySmoothInside many internal organsInvoluntaryEx: StomachCardiacFound only in the heartNever gets tired (unlike skeletal muscles)
9 Respiratory System Function: Moves oxygen from the outside environment into the body.It also removes carbon dioxide and water from the body.BrainPop Video – Respiratory System
11 Circulatory System Function: (aka: Cardiovascular System)Function:Carries needed substances to cells and carries wastes away from cells.BrainPop Video – Circulatory System
12 Organs – Blood Vessels Arteries Capillaries Veins Blood vessel that carries oxygen-rich blood away from the heart and to the body parts.CapillariesSmall blood vessels where materials are exchanged between the blood and the body’s cells (oxygen & carbon dioxide)VeinsCarries oxygen-poor blood (w/carbon dioxide) back to the heart (to be pumped out to the lungs)
14 Blood Blood is made of 4 components (parts): Plasma – liquid part of bloodRed blood cells – take up oxygen in the lungs and deliver it to cellsWhite blood cells – the body’s disease fighters (part of immune system)Platelets – cell fragments used in forming blood clots (that make scabs)BrainPop Video - Blood
15 Digestive System Functions: Breaks down food into molecules the body can use.Molecules are absorbed into the blood & carried throughout the body (by the circulatory system).Wastes are eliminated from the body (by the excretory system)BrainPop Video – Digestive System
16 Roles of Organs Mouth – mechanical & chemical digestion starts here Mechanical – physically breaking down food (teeth)Chemical – breakdown of molecules of food (saliva)Esophagus – muscular tube connecting the mouth to the stomachPeristalsis (muscle contraction) moves the food
17 Roles of Organs Stomach Small Intestine Most mechanical digestion takes placeSome chemical with the help of digestive juices (enzymes & acids)Small IntestineMost of the chemical digestion takes placeAbsorption of nutrients from digested food into the bloodstream
18 Excretory System Function: Collects wastes produced by cells and removes the wastes from the body.
19 OrgansKidneysEliminate urea, excess water, & some other waste materialsFilter wastes from the bloodProduce urineBrainPop Video – Urinary System
20 Nervous System Functions: Receives information about what is happening inside & outside of the body.Directs the way your body responds to this information. (Remember stimulus and response?).Helps maintain homeostasis.BrainPop Video – Nervous System
21 Organs of the Nervous System BrainNerves (neurons – nerve cells)Spinal Cord
22 Immune System Function: 3 Lines of Defense: Provides a barrier against pathogens (disease causing agents).Defends the body against pathogens.3 Lines of Defense:First line of defense: barrierSecond line of defense: inflammatory responseThird line of defense: immune system targets specific pathogensBrainPop Video – Immune System
23 First Line of Defense (Barriers) SkinChemicals in oil & sweatPathogens fall off with dead skin cellsMucus & ciliaTrap and remove pathogens that enter the respiratory systemSneezing & coughingForce pathogens out of the bodySalivaDestructive chemicals
24 Preventing Infectious Disease Active immunityOccurs when a person’s own immune system produces antibodies in response to a pathogen; remembers how to “fight” the pathogenTwo ways to gain active immunity:Infection with pathogenVaccine – weakened or killed pathogenEx: chicken pox vaccinePassive immunityAntibodies are given to the person to fight a disease; their own body did not make themEx: rabiesBrainPop Video - Vaccines