Ch 34 vertebrates

The largest and most diverse group of chondrichthyans includes the sharks, rays, and skates. The nerve cord of a chordate embryo develops from a plate of ectoderm that rolls into a tube dorsal to the notochord.

They are marine suspension feeders. It provides propelling force in many aquatic species. Other characters common to gnathostomes include Enhanced sensory systems, including the lateral line system An extensively mineralized endoskeleton Paired appendages 16 Chondrichthyans Sharks, Rays, and Their Relatives Members of class Chondrichthyes Have a skeleton that is composed primarily of cartilage The cartilaginous skeleton Evolved secondarily from an ancestral mineralized skeleton The lateral line system is a row of microscopic organs sensitive to changes in the surrounding water pressure — enables animal to detect minor vibrations. The allantois is a disposal sac for certain metabolic wastes pro- duced by the embryo. The chorion and the membrane of the allantois exchange gases between the embryo and the air. The reproductive tract, excretory system, and digestive tract empty into a common cloaca. These pharyngeal slits function as suspension-feeding structures in many invertebrate chordates; are modified for gas exchange in aquatic vertebrates; develop into parts of the ear, head, and neck in terrestrial vertebrates. The cartilaginous skeleton evolved secondarily from an ancestral mineralized skeleton. The young of marsupials are born very early in their development. Monotremes are a small group of egg-laying mammals consisting of echidnas and the platypus. Other derived characters of primates: A large brain and short jaws. Figure A sea lamprey 18 Origins of Bone and Teeth Mineralization appears to have originated with vertebrate mouthparts. Fishes control their buoyancy with an air sac known as a swim bladder. It completes its embryonic development while nursing in a maternal pouch called a marsupium. It provides skeletal support throughout most of the length of a chordate.

Fishes control their buoyancy with an air sac known as a swim bladder. In many species, the tail is greatly reduced during embryonic development.

vertebrates flashcards

The yolk sac contains the yolk, a stockpile of nutrients. Birds are endothermic, capable of keeping the body warm through metabolism. Figure A sea lamprey 18 Origins of Bone and Teeth Mineralization appears to have originated with vertebrate mouthparts.

In most vertebrates, a more complex, jointed skeleton develops and the adult retains only remnants of the embryonic notochord.

Chapter 34 vertebrates reading guide answers

Their extinction may have been partly caused by an asteroid. Lancelets are marine suspension feeders that retain the characteristics of the chordate body plan as adults. It provides skeletal support throughout most of the length of a chordate. Juveniles, not adults, have a notochord. Presentation on theme: "Chapter 34 Vertebrates. Figure The amnion protects the embryo in a fluid-filled cavity that cushions against mechanical shock. There are three main groups of living primates: Lemurs, lorises, and pottos Tarsiers Anthropoids monkeys and apes Humans are members of the ape group. Mammals have Mammary glands, which produce milk Hair A larger brain than other vertebrates of equivalent size Differentiated teeth. Reptiles have scales containing keratin that create a waterproof barrier and lay shelled eggs on land Figure Presentation on theme: "Chapter 34 Vertebrates. The tail contains skeletal elements and muscles. Fertilization is external in most species, and the eggs require a moist environment.

They are marine suspension feeders. Monotremes are a small group of egg-laying mammals consisting of echidnas and the platypus. Reptiles have scales that create a waterproof barrier.

Invertebrates quizlet

The reproductive tract, excretory system, and digestive tract empty into a common cloaca. Monotremes are a small group of egg-laying mammals consisting of echidnas and the platypus. The membrane of the allantois also functions with the chorion as a respiratory organ. The chorion and the membrane of the allantois exchange gases between the embryo and the air. Osteichthyes includes the bony fish and tetrapods. Molecular and morphological data give conflicting dates on the diversification of eutherians. The tail contains skeletal elements and muscles. It provides propelling force in many aquatic species. Dinosaurs, with the exception of birds, became extinct by the end of the Cretaceous. Figure A sea lamprey 18 Origins of Bone and Teeth Mineralization appears to have originated with vertebrate mouthparts. Juveniles, not adults, have a notochord. The extraembryonic membranes are the amnion, chorion, yolk sac, and allantois. Most rays are flattened bottom-dwellers that crush molluscs and crustaceans for food. In most vertebrates, a more complex, jointed skeleton develops, and the adult retains only remnants of the embryonic notochord. Most fishes breathe by drawing water over gills protected by an operculum.

The animals called vertebrates get their name from vertebrae, the series of bones that make up the backbone. Gnathostomes jaws might have evolved from skeletal supports of the pharyngeal slits.

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