Vertebrates - Ch. 29

Question 1

characteristics of chordates

Answer 1

notocord, dorsal hollow nerve cord, pharyngeal slits of clefts, muscular post anal tail

Question 2

notocord

Answer 2

a longitudinal, fle, xible rod between the digestive tube and nerve cord, provides skeletal support throughout the length of the chordate

Question 3

dorsal, hollow nerve cord

Answer 3

hollow, tubular structure derived from ectoderm, which is located dorsal to the notochord in chordates, develops into the central nervous system (brain and spinal cord)

Question 4

pharyngeal slits/clefts

Answer 4

grooves in the pharync called pharyngeal clefts develop into slits that open to the outside of the body

Question 5

what are the functions of the pharyngeal slits?

Answer 5

• suspension feeding structures in many invertebrate chordates
• gas exchange in vertebrates (except with tetrapods)
• develop into parts of the ear, head, and neck in tetrapods

Question 6

muscular post anal tail

Answer 6

chordates have a tail posterior to the anus, the tail is greatly reduced during embryonic development, contains skeletal elements and muscles, provides a propelling force in many aquatic species

Question 7

cephalochordata

Answer 7

subphylum to the chordates
lancelets
bladelike shape
marine suspension feeders that retain characteristics of the chordate body plan as adults
they are small and fish like
closest living invertebrate relative to the vertebrates