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Ch28:Human Nutrition
Human Nutrition
Question | Answer |
---|---|
What are herbivores | Animals that feed mainly on plants eg cattle/sheep |
What are carnivores | Animals that feed mainly on animals eg dogs/cats |
What are omnivores | Animals that feed on plants and animals eg humans/badgers |
What are autotroph | Make their own food by photosynthesis |
What are heterotrophs | Cannot make their own food so take their food from the environment eganimals and fungi |
Name two types of heterotrophs | Parasites and saprophytes |
What are parasites | Take in their food from a live source causing harm eg flees and disease causing bacteria |
What are saprophytes | Take in their food from dead organic matter eg bacteria and fungi of decay |
What is igestion | Taking of food into the digestive system (when food is out in the mouth) |
What is digestion | Breakdown of food can be physical or chemical |
What is absorption | When digested food passes from the digestive system and enters the blood |
What is egestion | Removal of unabsorbed waste from the digestive system as faeces |
Name the four types of teeth | Incisor,canine,molar and premolar |
What is mechanical breakdown | Takes place in the mouth by chewing and grinding action of teeth on food |
What is chemical digestion | Enzyme amylase found in saliva produced by three pairs of slavery glands |
What is peristalsis | Peristalsis is a wave of muscular action in the walls of the alimentary canal that moves the contents along |