Powerpoint presentation HW

All this animals have a notochord,postanal tail, nerve chord and pharyngeal pouch.

Definitons:

1. Chordate: Animals that 4 structures present at some stage of their development.

2. Nerve chord: A tubelike structure located above the notochord.

3. Pharyngeal pouches: Are sac-like projections found in the region between the mouth and the digestive tube.

4. Postanal tail: A muscular structure at the end of the developing chordate.

5. Endoskeleton: An internal supporting skeleton, derived from the mesoderm, that is characteristic of vertebrates and certain invertebrates.

6. cartilage: A tough, elastic, fibrous connective tissue found in various parts of the body, such as the joints, outer ear, and larynx. A major constituent of the embryonic and young vertebrate skeleton, it is converted largely to bone with maturation.

7. vertebrae:  A vertebra is one of 33 bony segments that form the spinal column of humans. There are 7 cervical, 12 thoracic, 5 lumbar, 5 sacral and 4 coccygeal.

8. ectotherm: cold-blooded.

9. endotherm: warm-blooded.