AIM: What is a vertebrate? OBJ: Given notes and activity sheet SWBAT explain the characteristics of chordates and vertebrates with 70% accuracy DN: Distribute Vertebrate Review Sheets ACT: Introduction to Chordates & Vertebrates (notes) Introduction to Ectotherms vs. Endotherms Text, read p , Complete What is a Vertebrate? Activity Sheet HW: Complete What is a Vertebrate? Activity Sheet; Invertebrate Exam, Nov 12.

Chordate Characteristics Notochord – flexible rod (pre-backbone / vertebral column), nerve cord (pre-spinal cord) running down back and slits in throat area. Phylum Chordata: all vertebrates, few invertebrates

Lancelets nerve cord notochord gill slits

Human embryonic gill slits

Human Embryo

Vertebrate Characteristics endoskeleton protects organs, body shape/support, muscle attachment backbone (vertebral column, “spine”) protects spinal cord and provides flexibility

Ectotherms vs. Endotherms Ectotherm: an animal whose body temperature is close to the temperature of their environment; its body does not produce much internal heat ; “cold-blooded”. Example: fishes, amphibians, reptiles Endotherm: an animal whose body temperature is stable and often warmer than their environment; its body regulates its own temperature by controlling the internal heat it produces;“warm-blooded” Example: birds, mammals

White/Yellow = Warm Blue/Purple = Cold