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BIOL212
Majors animal: Anatomy of the lancelet (matching)
| Anatomy | Physiology |
|---|---|
| Myomeres | Provide muscular movements for swimming and burrowing |
| Notochord | Provides skeletal support for anchoring myomeres to provide lateral body movements |
| Dorsal nerve cord | Handles majority of nervous coordination without intervention of the brain |
| Rostrum | Anterior projection shielding entrance to the mouth dorsally |
| Wheel organ | Lined with cilia, which produce a current of water that brings food into the mouth |
| Oral cirri | Act as a strainer to exclude larger particles from the mouth (filter feeding) |
| Pharyngeal gills | Have thin mucous coating that traps ingested food particles; also contain blood vessels supplementing gas exchange for respiration |
| Gill slits | Allow for outflow of water from pharynx between gill bars for food capture and respiration |
| Velum | Transverse partition encircling mouth |
| Pharynx | Receives incoming water from the mouth, entraps food in a film of mucus, and is responsible for some gas exchange |
| Hepatic cecum | Lateral outpocket of intestine responsible for intracellular digestion of small food particles and lipid and glycogen storage |
| Intestine | Site of enzymatic digestion of larger food particles |
| Atrium | Ventral body chamber that receives water passed from pharynx through gill slits |
| Atriopore | Discharges water from atrium to external environment |
| Anus | Regulates egestion of undigested food (feces) from the body |
| Dorsal aortae | Paired blood vessels that join behind the pharynx to form the median dorsal aorta, which carries nutrient-laden blood posteriorly to the body tissues and intestine |
| Nephridia | Ciliated ducts that transport metabolic wastes from the dorsal portions of the coelom to the atrium |
| Testes | Produce sperm for external fertilization |
| Ovaries | Produce ova for external fertilization |
Created by:
scandalouscanine
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