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Biology Revision 4

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  • What does the body use carbohydrates for?
    Energy
  • What role do ligaments play in joints? and mention two types of joints
    join bones at the joints/Hinge joint/ball and socket joint/pivot joints
  • Which part of the blood transports the glucose?
    Plasma
  • Why are capillary walls so thin?
    Capillary walls are thin to allow easy and quick exchange of gases, nutrients, and waste between blood and body cells.
  • How do antagonistic muscles work?
    One muscle contracts while the other relaxes to create movement.
  • How does the structure of a red blood cell help it carry oxygen?
    It has no nucleus and a biconcave shape to increase surface area for oxygen binding.
  • What is diffusion and where does it occur in the body?
    Diffusion is the movement of particles from high to low concentration, such as oxygen diffusing into the blood in the lungs.
  • Why does digestion make large molecules into smaller ones?
    they can then pass into the blood.
  • Name the addictive stimulant drug in tobacco smoke.
    Nicotine
  • Explain how the small intestine is adapted for absorption.
    It has villi with a large surface area and thin walls for efficient nutrient absorption.
  • (a) In which part of a plant would you find this type of cell?
    Leaves and green parts
  • What are the signs of a plant having a nitrate deficiency?
    Poor growth
  • Plant cells can carry out photosynthesis. How can you tell from the diagram that Euglena can carry out photosynthesis?
    chloroplasts
  • What are the three main types of blood vessels?
    Veins , Arteries and Capillaries
  • How does carbon monoxide in tobacco smoke affect people?
    It stops the blood from carrying as much oxygen as it could, by binding to red blood cells instead of oxygen.
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