Topic 5 Digestive System: Invertebrate Digestion

Question 1

• Rely on physical breakdown: occurs via cutting and grinding in mouth and churning in digestive tract and/or chemical breakdown: involved enzymatic hydrolysis -> smaller nutrients -> pass through semi-permeable membrane of gut cells to be further metabolized

Answer 1

Invertebrate

Question 2

• Hydra rely on intracellular and extracellular digestion

Answer 2

1. Cnidarians

Question 3

• Earthworms have one-way digestive tract
  a. Crop: food storage
  b. Gizzard: grind food
  c. Intestine: contains typhlosole to increase surface area for absorption

Answer 3

2. Annelids

Question 4

• Have jaws for chewing and salivary glands

Answer 4

3. Arthropods

Question 5

• Have radula, tongue/tooth structure that is located in mouth and breaks down food

Answer 5

4. Mollusks