Ch25 human nutrition

Question 1

heterotrophs

Answer 1

organisms that cannot make their own food

Question 2

digestion

Answer 2

breakdown of large food molecules into smaller soluble ones

Question 3

mechanical digestion

Answer 3

breakdown of food into smaller pieces by physical means such as teeth, chewing, churning

Question 4

chemical digestion

Answer 4

breakdown of food into smaller molecules by enzymes, stomach acid or bile

Question 5

peristalsis

Answer 5

waves of muscular contraction of the gut wall that moves the food along

Question 6

symbiotic bacteria

Answer 6

bacteria that live on or in another organism where at least one organism benefits