Circulatory System

Heart
1. Diagram:
2. Size of clenches fist
  1. Between lungs, under sternum, tilted to left
    1. 4 chambers: 2 ventricles (receiving), 2 atria (pumping out)
      1. Heart rate: Child - 90 -120, Adult - 72
        lub-DUB sound made by valves opening and closing
        Valves: prevent backflow of blood - move in 1 direction
Blood Vessels
1. Arteries
2. Arterioles
  1. Walls: Very thick (high pressure)
    1. Blood: Oxygenated
      1. Direction: From Heart To Body
3. Veins
  1. Walls: Thick (<Arteries)
    1. Blood: Deoxygenated
      1. Direction: To Heart From Body
        Extras: Have valves
4. Venules
5. Capillaries
  1. Walls: Thin - transfer nutrients, gasses, etc.
    1. Blood: Both
      1. Direction: Both
Blood
1. Plasma
  1. RBC
    1. WBC
      1. Platelets
        Cell fragments
        Clotting
      2. Fight harmful microbes and bacteria
      3. Part of immune system
    2. No nucleus - biconcave (more space for gasses)
    3. Transports gas
    4. Red - Haemoglobin pigment (iron component)
  2. Transport medium
  3. Clear
2. Fluid Tissue
Diseases
1. High Blood Pressure (Hypertension)
  1. Heart Attack
    1. Stroke
Transports - nutrients, oxygen to all body cells - waste substances to excretory organs
1. Kidneys, lungs, skin, colon

Resource summary

	Created by mary.wheeler.yeh over 8 years ago