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6. At the arterial end of the capillaries, what is the net movement of fluid?

  • Net loss of fluid
  • Net gain of fluid

7. Why do multicellular organisms need specialised transport systems?

  • Digested food is only needed by some cells for respiration
  • SA:V ratio gets smaller as the organism gets bigger so diffusion distance increases- diffusion no longer effective
  • Waste products don't need to be transported to the excretory organs

8. What is the oncotic pressure?

  • The tendency of water to move into the blood by osmosis
  • The movement of water from an area of high concentration to an area of low concentraion

9. What is the name of the fluid that surrounds the cells of the body?

  • Tissue fluid
  • Blood
  • Lymph

10. What causes the high hydrostatic pressure in the arterial end of the capillaries?

  • Contractions of the heart
  • Contractions of skeletal muscle
  • Osmosis
  • Oncotic pressure

11. What substance is NOT forced out of the arterial end of the capillaries?

  • Amino acids
  • Plasma proteins
  • Dissolved oxygen
  • White blood cells

12. Why does the blood within the capillaries have a lower water potential than the fluid outside?

  • The oxygen decreases the water potential
  • The plasma proteins decreases the water potential
  • The red blood cells decreases the water potential

13. What is NOT a feature of a closed circulatory system?

  • Substances enter/leave the blood through diffusion
  • Blood travels through the heart once in a circulation
  • Blood never leaves the vessels
  • No direct contact with the cells

14. Why is elastic tissue present in the walls of the arteries?

  • Control the amount of blood
  • To stretch and recoil in order to maintain high pressure
  • To allow blood to flow

15. At the venous end of the capillaries, what is the net movement of fluid?

  • Net gain of fluid
  • Net loss of fluid

16. What is the name of the process that involves plasma moving out of the capillaries?

  • Reabsorption
  • Ultrafiltration
  • Drainage

17. Why can't plasma proteins and red blood cells be forced out of the capillaries?

  • No net movement of molecules; concentration equal
  • Too big to fit through the gaps between the capillary cell walls
  • Stuck in the capillary cell walls

18. What does lymph contain?

  • Lymphocytes, fatty acids, oxygen, red blood cells
  • Lymphocytes, fatty acids, carbon dioxide, antibodies
  • Lymphocytes, plasma proteins, oxygen