Lab 8 Flashcards
(30 cards)
Deuterostomes?
Mouth forms second, anus forms first
radial cleavage
Indeterminate cells
Echinodermata?
Sea stars, urchins, cucumbers
five part radial symmetry
calcareous endoskeleton
bilateral symetrry for embryos
Water vascular system?
Unique to echinoderms
modified for locomotion
Keystone predators?
Sea star
keep populations of smaller organisms like sea urchins and mussels in check
Chordata?
Invertebrates and vertebrates
Notochord, dorsal hollow nerve cord, pharyngeal slits, post anal tail
Notochord?
longitudinal, endoskeletal rod that gives strength and elasticity to the body.
Dorsal Hollow nerve cord?
spinal chord of vertebrates
Pharyngeal slits?
Gas exchange
Post anal tail
muscular tail extends past anal opening
Lancelets?
Suspension feeders that burrow into sediment to feed
Myomeres act against notochord to move it into sediment
Oral hood?
lancelet
sorts food particle
Atrium?
common chamber where water goes after it accesses pharyngeal slits
atriopore?
water is dumped from here
Bony fish?
The vertebral column of fish is divided in two regions, the trunk and the tail
Axial skeletons?
skull and vertebrate
Tetrapods?
cervical, thoracic , lumbar, sacral, caudal
cervical?
neck (movement)
thoraric?
ribs to protect heart and lungs/ help breathing
lumbar?
stregnthen back
sacral?
fused to pelvic girdle, muscular attachment points
Caudal?
tail vertebrate
Homology?
certain characteristics arising from common ancestry
analogous?
appear similar but didnt come from common ancestry
circ system? (fish)
heart
