Ola 7th Blood Vessels
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Ola 7th Blood Vessels

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  • The capillaries are actually only one epithelial cell thick. They are so thin that blood cells can only pass through them in single file. The exchange of oxygen and carbon dioxide takes place through the thin capillary wall.
  • Away from heart--is lower the force of the ventricles

Ola 7th Blood Vessels Ola 7th Blood Vessels Presentation Transcript

  • Blood Vessels Ms. Hawthorne 7th Grade Chapter 4 Section 2
  • Quick Fact
    • Why does your blood look blue through your skin?
    • Blood is a bright red in its oxygenated form (i.e., leaving the lungs). It's a dark red in its deoxygenated form (i.e., returning to the lungs). Veins appear blue because light, penetrating the skin, is absorbed and reflected back to the eye. Since only the higher energy wavelengths can do this (lower energy wavelengths just don't have the *oomph*), only higher energy wavelengths are seen. And higher energy wavelengths are what we call "blue."
  • Blood Vessels
    • Arteries
    • Capillaries
    • Veins
  • Arteries
    • When blood LEAVES the heart, it travels through arteries.
    • Right ventricles pumps to lungs
    • Left ventricle pumps blood through aorta
    • Organs get blood from arteries that branch off aorta
  • Coronary Artery
    • First vessels that branch off the aorta
    • Carry blood to the heart
  • Artery Structure
    • Very thick
    • Three layers
      • Innermost: Epithelial Tissue
      • Middle: Muscle Tissue
      • Outer Wall: Flexible Connective Tissue
  • Capillaries
    • Tiny blood vessels that receive blood from the arteries
    • It is here that substances are exchanges between the blood and body cells
      • Diffusion: high concentration to low
        • Ex: glucose into cells
  • Veins
    • From capillaries, these vessels carry blood BACK to the heart
    • Three layers
    • Thinner than arteries
  • Blood Flow in Veins
    • Less force than when in arteries
    • Help move blood
      • 1. Muscles inside veins contract and move blood along
      • 2. Skeletal muscles nearby contract and move blood along
      • 3. Larger veins have valves to prevent backwards flow
  • Blood Pressure
    • Pressure = force exerted over an area
    • BP = blood exerting pressure against walls of blood vessels
    • Caused by = force with which ventricles contract
    • As blood moves away from the heart, the pressure lowers. Why?
    • Highest in arteries, lowest in veins.
  • Measuring BP
    • Sphygmomanometer = instrument used
    • Expressed with 2 numbers in mm of Mercury
    • 1st number: measure of BP while ventricles contract
    • 2nd number: lower, MP while ventricles relax
    • Typical young BP: 120/80
  • Pulse
    • Expansion and relaxation of the artery wall
    • When ventricle contracts, it squirts blood through arteries in the body & walls expand.
    • After blood passes, the walls narrow again.
    • Pulse = heart beat