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Systems of the Human Body
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Systems of the Human Body


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  • 1. 1 Systems of the Human Body
  • 2. 2 Cells work together to form tissues Tissues work together to form organs Organs work together to form organ systems Levels of Organization
  • 3. 3 There are 10 organ systems in the Human Body: – Circulatory – Respiratory – Skeletal – Muscular – Digestive – Excretory – Reproductive – Integumentary – Nervous – Endocrine These organ systems are woven together such that one cannot work without the other. Mnemonic :
  • 4. 4 Circulatory and Respiratory Systems Circulatory System – contains the heart and all the blood vessels – Responsible for movement of blood, nutrients, and gases – Heart pumps blood to lungs to receive oxygen and then to the rest of the body Respiratory System – Responsible for bringing in oxygen and ridding our bodies of carbon dioxide – Lungs, diaphragm, and windpipe – Oxygenates our entire body
  • 5. 5 Skeletal System • The skeletal system is the internal support and movement system Includes bones, cartilage, teeth, joints and ligaments. • About 206 bones in the Human Body
  • 6. 6
  • 7. 7 Skeletal System • 5 major functions: – Protection – protects vital organs – Storage – stores minerals (Calcium) and fat – Movement – muscles pull bones to move - Limbs act as rigid levers against which muscles can work – Blood Cell Formation – make blood cells – Support – shape and form – supports the body against gravity
  • 8. 8 Skeletal System
  • 9. 9 Skeletal System Types of joints • Sliding joint – bones glide over each other (Example: hand)
  • 10. 10 Skeletal System Types of joints • Ball and socket joint – like a joystick in a computer game (Example: shoulder)
  • 11. 11 Skeletal System Types of joints • Hinge joint – like a door hinge, flex and extend (Example: knee)
  • 12. 12 Sliding Joint 3 types of joints Ball and socket joint like a joystick in a computer game (Example: shoulder) Sliding joint bones glide over each other (Example: hand) Hinge joint like a door hinge, flex and extend (Example: knee)
  • 13. 13 Muscular System The muscular system works with the skeletal system to provide movement. • Voluntary – muscles move under your control – Example: skeletal muscles, bicep, quadriceps • Involuntary – muscles that move without you controlling them – Example: smooth and cardiac, and sometimes skeletal (eyes blinking)
  • 14. 14 Tendons – connect muscles to bones
  • 15. 15 Ligaments – connect bone to bone
  • 16. 16 Muscle Types Location in the body: Location in the body: Location in the body: Smooth Cardiac Skeletal only in digestive tract & blood vessel walls only in the heart muscle attached to the bones
  • 17. 17 Integumentary System • Includes your hair, nails, and skin • Largest organ system in your body • Your body’s first line of defense
  • 18. 18 Integumentary System • Skin – keeps fluids in your body and foreign particles out – nerves are in your skin to help you feel – Regulates your body temperature with the help of sweat glands – Melanin – absorbs ultraviolet radiation from the sun • Epidermis – top layer of skin, most cells are dead, about as thin as 2 sheets of notebook paper • Dermis – under epidermis, allows skin to bend without tearing
  • 19. • Hair and Nails - Hair gets its color from the melanin - Hair roots and nail beds have new cells, but your hair hanging off your head and your nails are all dead cells, 19 Integumentary System YUCK!
  • 20. 20 And the rest of them… • Excretory System - release of wastes and regulates bodily fluids • Reproductive System – Male: produces and delivers sperm – Female: produces eggs and shelters unborn baby • Nervous System – receives and sends electrical messages throughout the body • Digestive System – breaks down the food you eat into nutrients for your body • Endocrine System – regulate body functions by sending chemical messages
  • 21. 21 Forces with our body • Motion and Forces are acting all around us. They are also acting in us. – Example: When the heart pumps it exerts a force which pushed blood throughout the body – Example: Blood Pressure is measured by the force exerted on the walls of blood vessels by blood pushing on them