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Fluids Pressure and Circulation
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  1. Fluids Pressure and Circulation Chapter 11

  2. Fluids • Fluids are part of your body • Fluid is a material that can easily flow , such as a gas or a liquid. • Fluids flow to fit the shape of containers

  3. Fluids • Examples: • Cytoplasm • Blood • Liquid in joints

  4. Fluids • Fluids push in all directions • This pushing means that there is a force that is exerted • This force is not applied in just one place but is spread over an area

  5. Pressure • Pressure is a measure of how much force is acting on a certain area • Air moves from areas of higher to lower pressure when you breathe • In what directions do fluids push?

  6. Pressure • All

  7. Pressure • When you breathe out the volume of the lungs becomes smaller so the air is compressed and the air in your lungs is at a higher pressure. • Explain this.

  8. Pressure • To fill your lungs you inhale using a muscle called the diaphragm

  9. Pressure • How to measure pressure • Pressure is measured in Pa (Pascal) • Force is measured in N (newton) • Area is measured in m2 (square meters) • P= F/A

  10. Pressure • Questions

  11. Fluids and Pressure • Fluids spread out. So the pressure is greater next to the force, but is less greater away from the force.

  12. Section 2 Blood: Circulatory System • Pressure and Fluids in the Circulatory System

  13. Circulatory System • Blood moved around the body

  14. Blood • A fluid that circulates the body • Blood is made of Red and White cells • These cells are carried in liquid called plasma • Plasma is made of water, proteins, and glucose

  15. Blood and the Heart • There are two circuits that the heart pumps • Pulmonary Circuit • Systemic Circuit

  16. Pulmonary Circuit • Blood goes to the lungs and back to the heart

  17. Systemic Circuit • Blood goes to the body and back to the heart

  18. MONDAY May 7

  19. How the heart pumps • The heart pumps using • Arteries • Capillaries • Veins

  20. Arteries • Blood leaving the heart is at high pressure so the artery wall must be thick

  21. Capillaries • Smallest blood vessels

  22. Veins • The blood pressure is lower than in arteries

  23. How the heart pumps • See diagram

  24. Functions of Fluids • Divert and Spread forces • Support • Transport materials • Lubricate • Block Materials

  25. Functions of Fluids • Divert and spread forces • Fluid in a blister spreads a damaging force to a larger area and so reduces further damage

  26. Functions of Fluids • Support • Fluid pressure inside cells makes the cells firm

  27. Functions of Fluids • Transports materials • Flowing blood carries nutrients to cells and waste away from cells

  28. Functions of Fluids • Lubricate • Tears help the eyelids glide more easily

  29. Functions of Fluids • Block materials • Tears help keep dust from reaching the eye’s surface and also keep the surface from drying out

  30. Our Senses and Fluids • Mouth- Saliva moves materials from your taste buds • Nose- Mucus helps move materials to cells to detect smells • Ear- helps us with our balance • Eye- sight

  31. The Ear • Three ear cavities help you with position and motion • Semicircular Canals

  32. The Ear • The outer and middle part of the ear is filled with air • The innermost ear and semicircular cannals have liquids.

  33. The Eye • Tears: Flow outside the cornea • Aqueous humor: is a fluid that transports nutrients to the lens and cornea and carries away wastes

  34. Organ Systems and Fluids • Circulatory and Lymphatic System • Respiratory System • Digestive and Urinary System • Nervous System • Reproductive System • Muscular and Skeletal Systems

  35. Circulatory and Lymphatic System

  36. Respiratory System

  37. Digestive and Urinary System

  38. Nervous System

  39. Reproductive System

  40. Muscular and Skeletal System