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6. How can stents be used to reduce the risk of heart attacks?

  • Keep the arteries open
  • Close the arteries
  • Keep the veins open
  • Keep the mouth open

7. How do fault heart valvaes lead to poor circulation?

  • bLOOD
  • Allow harmfuk chemicals into the blood
  • Won't open properly, blood doesn't circulate as effectively.
  • Faulty valves can only move in squares, not circles, meaning no circulation, just squarulation

8. What is the purpose of platelets in blood?

  • Carry antibodies
  • Carry the RBC and WBC
  • Help the blood clot
  • Carry oxygen
  • When the RBC don't want a full meal so only need a small plate; platelet

9. During a 12 min run, Harvey took 495 breaths. Calculate his average breathing rates in breaths per minutes.

  • 41.25
  • 5940
  • 0.24
  • 69

10. What is the function of the coronary arteries?

  • Surround heart, reducing the pressure and therefore chance of a heart attack.
  • Surround heart, ensuring ribs cannot damage it.
  • Surround heart, giving all oxygen needed.
  • Surround heart, giving it a big hug.

11. How are veins adapted to carry blood back to the heart?

  • Bigger lumen, valves, thick wall
  • Bigger lumen, valves, elastic fibres
  • Bigger lumen, valves, thin wall
  • They have imrpovised, adapteded, and overcomed (?)

12. Why do enzymes have an optimum pH?

  • The optimum pH is the point at which the enzyme works best
  • If the pH is too low or too high it can interfere with the bonds holding the enzyme togther.
  • They like it neutral because neutralisation creates salt and they are salty bois
  • If they didn't have an optimum pH then they would work in all conditions and that would mean there is no need for different enzymes in different places (e.g. no need for pepsin.

13. The 3 ways in which RBCs are adapted to carry blood:

  • Biconcave, large surface area, no nucleus
  • Biconvex, small surface area, big nucleus
  • Red, blood, cells
  • Biconcave, large surface area, big nucleus

14. Bile is a product of the liver. What is it's role in digestion?

  • Neutralises the acid to make conidtions alkaline.
  • Converts lipids into glycerol
  • Neutralises the alkaline to make conidtions alkaline.
  • Motivates the other enzymes. Sings songs such as 'Oh when the enzymes. Oh when the enzymes. Oh when the enzymes break down the food *oh when the enzymes*

15. Name the 3 parts of the digestive system that produce protease enzymes

  • Liver, salivary glands, gall bladder
  • Pancreas, stomach, small intestine
  • Pancreas, stomach, large intestine
  • Penis, testicles, rectum

16. An enzyme-controlled reaction was carried out at pH 4. After 60 secibdsm 33cm^3 of a product had been released. Calculate the rate of reaction in cm^3/s

  • 55
  • 0.55
  • 5.5
  • 5555555555555555555555555555555555555555555