B8 exchange systems

• Arteries: carry blood AWAY

  -pumps blood at high pressure

  -thick tissue around lumen
• capillaries

  -exchanges nutrients and oxygen with tissue (aveoli/villi)

  -thin permeable walls

  -low blood pressure
• veins

  -carrys blood TOWARDS heart

  -thin walls and wide lumen

  -low pressure blood

  -valves=prevent back flow
• Name the four chambers of the heart

  Left and right atria, left and right ventricles
• The left ventricle has thicker muscular walls to be able to pump blood under high pressure around the body
• order of blood flow: Lungs, pulmonary vein, left atrium, left ventricle, aorta, body, vena cava, right atrium, right ventricle, pulmonary artery, lungs
• What are the units for cardiac output?

  cm3 per minute
• What are the units for heart rate?

  Beats per minute
• What are the units for stroke volume

  cm3
• What is the word equation for aerobic respiration?

  Glucose + oxygen → carbon dioxide + water
• celluar respiration

  -the process of releasing energy from glucose constantly happening in every living cell


  -An exothermic reaction that releases energy for metabolic processes
• aerobic

  -plenty enough o2

  -best way to repsire
• anaerobic

  -without o2

  -least efficent

  -only when WE HAVE TO
• cons of anaerobic

  • releases much less energy
  • glucose is partially broken down
  • lactic acid builds up =leads to cramps
• anaerobic in plants

  glucose→ ethanol + co2
• Compare the speeds of aerobic and anaerobic respiration

  Anaerobic respiration happens faster