Download presentation
Presentation is loading. Please wait.
1
Introduction to Animals
2
All living things used to be classified into 5 kingdoms before we reorganized it into the 3 domains and 6 supergroups we’ve learned about.
4
Characteristics of all Animals
5
Animal Characteristics
DEFINING CHARACTERISTCS OF ANIMALS 1. Heterotrophs: ingest their food 2. Multicellular: 3. Eukaryotic: animal cells with a nucleus and organelles (large diversity of cell specialization) 4. No cell walls TWO MAIN DIVISIONS: Invertebrate: all other phyla without internal skeletons Vertebrate: Phylum Chordata – internal skeleton
6
Eucaryotic (The cell has a nucleus)
7
Multicellular (allows cell specialization) Specialized cells are more efficient than non-specialized cells
8
Heterotropic (They obtain food by eating other organisms (herbivores, carnivores or omnivores)).
9
Can move (are motile) at some point in their life
10
Respond to stimuli (nerves)
11
Respiration – moves oxygen into the organism and removes CO2
12
Most animals reproduce sexually but some can reproduce asexually
15
Cell Specialization Animals contain many specialized cells
each has a shape, physical structure, and chemical composition that make it suited for it’s particular function called “division of labor” specialized cells perform tasks much more efficiently
19
Symmetry None – Porifera Radial – Cnidaria Bilateral – All others
Pentamerous Radial Symmetry – Echinoderm Adults only Earland
21
Concentration of nerves and sense organs at the front end or head of the organism.
22
Body cavities – Acoelom (no body cavity)
23
False body cavity - Pseudocoelomate
– partial fluid filled body cavity (coelom) -Partly lines with internal tissue (mesoderm) - Internal organs are loosely held in place
24
True body cavity - coelom
Coelom – fluid filled body cavity, completely lined with internal tissue (mesoderm). Has suspended internal organs
26
Earland
27
Tissue Layers Endoderm - digestion and respiration structures
Mesoderm - muscles, bones, blood, and reproductive organs Ectoderm - skin, brain, and nervous system
28
Animal Systems In order to survive, animals must be able to perform a number of essential functions Feeding Respiration Internal Transport Excretion Response Movement Reproduction
29
The 7 Essentials Feeding – heterotroph, autotroph, etc.
Respiration – skin or full system Internal Transport – closed or open circulation Excretion – waste removal Response – nerve cells – brain- specialized organs Movement – exo or endoskeleton, muscles Reproduction – sexual or asexual
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.