*Components:*
1. Foregut (stomach)
2. Gastric mill
3. Anterior chamber
4. Posterior chamber
5. Midgut (small intestine)
6. Midgut glands (tomally)
7. Hindgut (large intestine/rectum)
8. Posterior midgut diverticulum (cecum)
*Gastric Mill:*
1. Highly developed in lobsters
2. Three movable teeth (median, two lateral)
3. Ossicles (skeletal plates) support teeth
4. Chews food into smaller pieces
*Digestive Process:*
1. Food enters anterior chamber
2. Gastric mill grinds food
3. Setose filter prevents large particles from entering midgut glands
4. Midgut glands secrete digestive enzymes
5. Absorption and storage of nutrients occur in midgut glands
6. Undigested waste passes to hindgut/rectum
7. Fecal material egested through anus
*Key Features:*
1. Specialized gastric mill for chewing food
2. Midgut glands (tomally) for digestion, absorption, and storage
3. Hindgut/rectum modified for waste elimination
*Comparison with Shrimps:*
1. Lobsters have more developed gastric mill
2. Shrimps chew food thoroughly with mouthparts
Here's an overview of the lobster's circulatory system:
_Components:_
1. Heart (located under middorsal surface of cephalothorax)
2. Pericardium
3. Ostia (three pairs)
4. Arteries:
- Dorsal abdominal artery
- Ventral thoracic artery
- Ventral abdominal artery
- Sternal artery
5. Veins (not specified)
_Circulatory Process:_
1. Blood collects in pericardium
2. Ostia open, allowing blood to flow into heart
3. Heart contracts, pumping blood forward
4. Blood flows through arteries to vital organs
5. Blood supplies flexor and extensor muscles, gonads, and other tissues
_Key Features:_
1. Open circulatory system
2. Heart located under cephalothorax
3. Three pairs of ostia regulate blood flow
4. Arteries supply blood to various tissues
_Comparison with Shrimps:_
1. Similar circulatory system
2. Lobsters have additional ventral abdominal artery extending through abdomen
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