Biology Week 27 Digestion & Excretion Name _______________________

Matching questions - place the letter of the term in the right column that best fits the definition in the blank by the definition.

_______ 1. Breaks large pieces into smaller ones A. urea
_______ 2. Breaks complex chemicals into simple ones B. physical digestion
_______ 3. Molecules that provide energy and material for growth C. dentine
_______ 4. Most of the fats found in foods are D. incisors
_______ 5. The process of removing metabilic wastes E. excretion
_______ 6. The most common mammalian metabolic waste F. chemical digestion
_______ 7. Inorganic substances required by the body G. triglycerides
_______ 8. Round teeth for puncturing H. canines
_______ 9. Teeth with a single cutting edge I. nutrients
_______10. The porous "bone" of a tooth J. minerals

Multiple choice questions - place the letter of the best answer in the blank beside the question number.

_______ 11. The two-part process that changes food into a form usable by body cells
. A. excretion B. elimination C. absorption D. none of these
_______ 12. The normal human mouth has more of this type of teeth than any other
. A. incisors B. premolars C. molars D. none of these
_______ 13. Chemical digestion begins in the
. A. mouth B. stomach C. small intestine D. none of these
_______ 14. Proteins are made up of long chains of
. A. glucose molecules B. amino acids C. starch molecules D. none of these
_______ 15. The only vitamin that the human body can synthesize
. A. vitamin D B. vitamin C C. vitamin A D. none of these
_______ 16. The rhythmic muscular contractions and relaxations of the esophagus
. A. sphincter B. peristalsis C. detoxification D. none of these
_______ 17. The waste product of cellular respiration
. A. carbon dioxide B. ammonia C. urea D. none of these
_______ 18. Food usually remains in the stomach for
. A. 2-3 hours B. 3-4 hours C. 6-8 hours D. none of these

True - False Questions: Use a plus (+) for true and a zero (O) for false.

_______ 19. Chemical digestion begins in the mouth.

_______ 20. Sugars are proteins.

_______ 21. The body can synthesize most of the vitamins it needs.

_______ 22. Over 50% of the human population is allergic to some food or food component.

_______ 23. The average adult stomach has a capacity of only two to three pints.

_______ 24. Finger-like projections called villi increase the surface area inside the stomach.

_______ 25. The large intestine is a coiled tube.

_______ 26. Pancreatic fluid contains sodium bicarbonate.

_______ 27. The most common mammalian metabolic waste is carbon dioxide.

_______ 28. The skin is your primary organ of excretion.

_______ 29. The cardiac sphincter controls when food passes between the stomach and small intestine.

_______ 30. The liver is the largest gland in the body.

_______ 31. The majority of your teeth are for cutting food.

_______ 32. Fats are the most concentrated source of energy in the diet.

_______ 33. The most amundant element in the body is oxygen.

_______ 34. Don't drink water until you feel thirsty.

_______ 35. Vegetables do not contain fats.

_______ 36. Chemical digestion occurs in the stomach, but not mechanical digestion.

_______ 37. The total length of the digestive system in an average adult is over ten meters.

_______ 38. Food passes through the liver during digestion.

_______ 39. Ammonia is a waste product so toxic that it can harming cells.

_______ 40. Drinks containing caffeine do not help hydrate the body.