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Digestive system

Digestive system. Function : Converts food into nutrients (macromolecules) that can be used by cells Absorbs food Eliminates wastes. Invertebrate organs : mouth, gastrovascular cavity, digestive sac, gizzard, crop,and intestines Main Vertebrate organs :

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Digestive system

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  1. Digestive system • Function: • Converts food into nutrients (macromolecules) that can be used by cells • Absorbs food • Eliminates wastes • Invertebrate organs: • mouth, gastrovascular cavity, digestive sac, gizzard, crop,and intestines • Main Vertebrate organs: • Mouth, pharynx, esophagus, stomach, small and large intestines, rectum

  2. Digestion Pathway

  3. Feeding • Most animals do not absorb food; instead they ingest it. • Animals range from filter feeders and herbivores to carnivores, and from commensalites to parasites. • All animals have developed different mouth structures and different digestive systems based on food and environmental adaptations.

  4. Figure 29–8 Invertebrate Digestive Systems Section 29-2 Intestine Gizzard Crop Mouth/anus Pharynx Mouth Gastrovascularcavity Annelid Anus Gastrovascularcavity Cnidarian Arthropod Crop Pharynx Anus Pharynx Mouth Rectum Mouth/anus Stomachanddigestive glands Flatworm Intestine

  5. Figure 33–8: The Digestive Systems of Vertebrates Shark Salamander Lizard Pigeon Cow Esophagus Stomach Intestine Liver Gallbladder Pancreas Cloaca Crop Gizzard Cecum Rectum Compare the digestive tracts of herbivores and carnivores?

  6. Mouth Pharynx Salivary glands Esophagus Liver Stomach Pancreas (behind stomach) Gallbladder (behind liver) Large intestine Small intestine Rectum Figure 38–10:The Human Digestive System (pg. 979) How are macromolecules transported to the cells of your body? Hint: name the body system

  7. The small intestine is where nutrients are absorbed from chyme (chewed –up food from the stomach). Special structures in the small intestine called villi help absorb the essential nutrients from chyme. Circular folds Epithelial cells Villi Capillaries Lacteal Vein Artery Small intestine Why does the small intestine have circular folds? Hint: the mitochondria and chloroplast have folds for the same reason.

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