Section 2 Invertebrates & Vertebrates

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Presentation transcript:

Section 2 Invertebrates & Vertebrates Chapter 32 Section 2 Invertebrates & Vertebrates

Invertebrate Characteristics Adult invertebrates show tremendous amount of morphological diversity

Symmetry Radial- jellyfish Bilateral- motile lifestyle- California sea hare

Segmentation Segmentation- body composed of repeating similar units Examples: earthworm & crayfish

Support of the body Sponges = soft tissue Round worms = fluid-filled cavities Exoskeleton- rigid outer covering that protects the soft tissues of many animals, especially arthropods

Respiratory System Animals give off CO2 by a means of gas exchange Gills- organs that consist of blood vessels surrounded by a membrane and are specialized for gas exchange in water

Circulatory System Moves blood to transport O2 & nutrients to cells CO2 & waste is moved away from cells Sponges & cnidarians have no circulatory system

Circulatory System Arthropods have an open-circulatory system- circulatory fluid is pumped by the heart through vessels and into the body cavity & returned to the vessels

Circulatory System Annelids & mollusks have a closed circulatory system- blood is pumped by a heart and circulates through the body in vessels that form a closed loop

Reproduction Sexual & asexual reproduction Earthworm Hermaphrodite- organism that produces both male and female gametes, allowing an individual to function as both male & female

Development Indirect development- immature form of organism that is morphologically different from adult stage- Larva Direct development- young animal is born or hatched with the same appearance as adult- no larva stage

Vertebrate Characteristics Fishes, amphibians, reptiles, birds & mammals

Segmentation & body support Vertebrate- repeating bony units of the backbone Terrestrial vertebrates evolved from aquatic vertebrates Endoskeleton- internal skeleton made of bone and cartilage

Body Coverings Integument- outer covering of an animal What different types of integuments do you know of? HINT: think of different animals & environments

Respiratory Lungs- organs for gas exchange composed of moist, membranous surfaces deep inside the animal’s body

Circulatory Vertebrates have a closed circulatory system with a multi-chambered heart Multi-chambered heart separates oxygenated and deoxygenated blood

Digestive Digestion occurs in the gut, which runs from the mouth to the anus

Excretory Kidneys- filter wastes from the blood while regulating water levels in the body

Reproduction Fish & amphibians- eggs & sperm are released directly into water Reptiles, birds & mammals- egg & sperm unite in body

REVIEW!!! Identify the function for body coverings. Compare the structure of endoskeletons & exoskeletons. How might the segmentation of arthropods help them survive?