2.3 - metabolic rate

• define metabolic rate?

  the quantity of energy consumed per unit of time
• how can metabolic rate be calculated?

  • oxygen consumption per minute
  • carbon dioxide produced per minute
  • heat produced per minute
• What types of apparatus can be used to measure metabolic rate?

  • respirometer
  • oxygen probe
  • carbon dioxide probe
  • calorimeter
• why is using a respirometer an indirect measurement of oxygen consumption?

  • oxygen inhaled but carbon dioxide not given out as absorbed by chemical in test tube
  • volume of gas in container is lower drawing more air/liquid up tube
• general units for metabolic rate?

  ml/min/kg
• how does a calorimeter measure metabolic rate?

  measures the change in temperature
• an increased metabolism requires an increased need for oxygen for respiration
• define complete circulatory system?

  2 atria and 2 ventricles

  oxygenated and deoxygenated blood do not mix within the heart
• what does an incomplete circulatory system consist of?

  2 atria and 1 ventricle

  oxygenated and deoxygenated blood mixes
• complete circulatory systems are more efficient than incomplete circulatory systems
• Describe the circulatory system in mammals and birds?

  double complete circulatory system

  2 atria , 2 ventricles

  no mixing of blood
• describe the circulatory system in amphibians and reptiles?

  double incomplete circulatory system

  2 atria , 1 ventricle

  mixing of blood
• describe the circulatory system in fish?

  single incomplete circulatory system

  1 atrium , 1 ventricle

  blood flows in a single circuit
• 3 abiotic factors that affect the ability of an organism to maintain its metabolic rate?

  • temperature
  • pH
  • salinity