B2: organisations

• In what order makes up an organ system

  Cells, Tissues, Organs and Organ Systems.
• What two things can denature the active site of an enzyme?

  PH and Temperature.
• What enzyme breaks down proteins and what is proteins broken down into?

  Protease, Amino Acids.
• What enzyme breaks down carbohydrates and what are carbohydrates broken down into?

  Amylase, Maltose and other sugars.
• What enzyme breaks down fats and what are fats broken down into?

  Lipase, Glycerol and fatty acids.
• Where all digestive enzymes produced?

  Small Intestine and Pancreas.
• What acid is found in the stomach and why is it needed?

  Hydrochloric acid, to kill bacteria and for the right PH for protease to work.
• Where is bile stored?

  Gallbladder.
• Where are the lungs located?

  The Thorax.
• What is the purpose of alveoli?

  Gas Exchange (diffusion oxygen diffuses out of it).
• Why is the human heart referred to as a double circulatory system?

  As the blood travels through the heart twice.
• Where is the pacemaker located?

  Right atrium.
• What is the point of a valve in a heart?

  To stop blood from flowing backwards.
• Why do arteries have thick walls?

  To withstand the high pressure within them.
• How thick is a capillary wall?

  one cell thick (so diffusion can take place).
• What do red blood cells carry?

  Oxygen.
• What are platelets?

  Parts of the blood that help it clot.
• What is plamsa?

  The part of the blood that carries everything.
• Cancer is caused by...

  Unwanted cell growth and division.
• What is the spongy mesophyll?

  contains big air spaces that allow gases to diffuse.
• When do the stomata close?

  At night.
• What is transpiration?


  The loss of water from a plant.
• What is transpiration caused by?

  The evaporation and diffusion of water from a plants surface.