Yr 11 - SCB - Physical Digestion (biology)

Question 1

what is physical digestion

Answer 1

breaking food down without any chemical changes

Question 2

why is physical digestion important

Answer 2

allows it to flow through the digestive easier and allows enzymes to work quicker

Question 3

Where does physical occur

Answer 3

• mouth with chewing

- intestines/stomach walls

Question 4

4 types of teeth and function

Answer 4

incisors - bite food
canines - tearing food apart
premolars - crushing food (2 cusps + double root)
molars - tear/crush food (4 cusps + triple/double root)

Question 5

teeth function of herbivore teeth

Answer 5

• incisors are sharp, broad, flat for cutting plant material (sometimes only in the lower jaw)
• canines are absent/if present only found in the lower jaw but reduced and blunt. Used to bite only only when chomping plant material/ not present as no meat eaten.
• molars have a large flat with a great surface area to grind and break plant material to increase surface area for digestion
• diastema is a gap between the teeth to allow space to reposition food as its chewed

Question 6

teeth function of carnivore teeth

Answer 6

• incisors are sharp, pointed and used to cut and sharp flesh from bones
• canines are long, sharp and together with the jaw, can generate great energy force that can puncture vital organs and kill prey as well as tearing meat of them