Introduction to Animals Section 1: Nature of Animals

Introduction to Animals Section 1: Nature of Animals

Introduction to Animals Section 1: Nature of Animals I. Vertebrate vs. Invertevrate A. Vertebrate has vertebrae or backbone surrounding nerve cord (spinal cord) B. Invertebrate no backbone surrounding

nerve cord; 95% of animal species!!! II. What is an animal? A. Multicellular each cell depends on the functions of all other cells 1. Specialization a cell has developed to perform one specific function; a division of

labor among the cells 2. Cell Junctions connections between cells that hold them together to make a tissue Review: Tissue group of specialized cells working on one function together B. Heterotroph animals must obtain

organic molecules (a.k.a. food) through ingestion. C. Sexual Reproduction & Development 1. The 1st cell is a fertilized egg diploid zygote 2. Differentiation zygote divides to produce more cells, which grow & learn the function(s) they will be responsible for.

***Differentiation is the process that results in Specialization!! D. Movement 1. Animals have muscle and nerve tissue (or at least cells). 2. Neurons (nerve cells) use electrical signals

to trigger muscle movements. III. Origin & Classification of Animals A. Flagellated, Colonial Protist gave rise to early invertebrates. B. An invertebrate gave rise to vertebrates

Section 2: Animal Bodies I. Symmetry describes organization of an animals body, if parts are arranged in mirror images of one another. A. Asymmetry body shows no symmetry

Ex: sponges, corals B. Radial Symmetry body has 2 or more planes of symmetry, body is arranged in a circular fashion

Ex: star fish, anemones, sand dollars C. Bilateral Symmetry body has only one plant of symmetry Ex: fish, mammals, birds (all vertebrates!)

II. Anatomical Positions term that describes areas of the body 1. Anterior towards the head 2. Posterior towards the tail 3. Dorsal towards the upper part or back of a standing animal

4. Ventral towards the lower part or belly of the standing animal 5. Medial towards the midline plane that separates right and left sides of a body 6. Inferior below or under a body part 7. Superior above or over a body part

8. Caudal toward the back or tail 9. Cranial toward the front or head III. Body Tissues & Cavities A. Germ Layers tissue types found in embryos 1. Sponges have none 2. Cnidarians & Ctenophores have 2 germ

layers (anemones and jellies) 3. All other animals have 3 germ layers Are mostly bilaterally symmetrical Show Cephalization concentration of sensory organs toward the anterior end (in the head)

B. Body Cavities fluid-filled space between digestive tract and outer wall of the body IV. Animal Phyla A. Ten Invertebrate Phyla

Very diverse in symmetry & body organization Ex: sponges, insects, starfish

B. One Vertebrate Phylum (Chordata) all animals have the following structures at one point in life, but many lose them as they mature 1. Notochord firm, flexible rod of tissue 2. Dorsal Nerve Chord located just above the notochord; gives rise to spinal cord

3. Pharyngeal Pouches our pockets of digestive tract at anterior end 4. Postanal Tail muscles near posterior end Section 3: Invertebrates vs. Vertebrates I. Invertebrates over 95% of animals

A. Symmetry radial or bilateral 1. Sponges are asymmetrical 2. Bilateral allows for cephalization B. Segmentation 1. Some invertebrates are segmented, the body is made of repeating units (earthworm)

2. Segments can be almost identical (earthworm) or very different (lobster). Segmentaion C. Body Support what holds the body up 1. Simple skeletons (sponges)

2. Fluids inside the body cavity push out on the outer covering of the animal (roundworms) 3. Exoskeleton: rigid, outer covering that protects body & must be shed as the animal grows. A new exoskeleton will grow in its place (animal is very vulnerable at that time).

D. Respiratory & Circulatory Systems 1. Respiratory exchange of gases (CO2 & O2) Most invertebrates exchange gases directly through their outer covering or gills 2. Circulatory moving fluid through the body to transport O2 and nutrients Open Circ. System: blood is pumped into

body cavity (no blood vessels) Closed Circ. System: blood travels through body cavity in vessels Open vs. Closed Circulatory Systems

E. Digestive & Excretory System 1. Digestion break down of food to gain nutrients Sponges: digestion occurs in each cell Digestion can occur in a central chamber (Cnidarians) Digestion can occur in a gut

E. Digestive & Excretory System (cont) 2. Excretion release wastes from the body Aquatic invertebrates: waste is released as ammonia Land invert.: ammonia is converted into a less toxic substance

F. Nervous System 1. Using electrical impulses to control body functions 2. Large amounts of diversity among invertebrates!!

G. Reproduction & Development 1. Hermaphrodites single animal produces both male and female gametes (earthworm) 2. Indirect Development enter a larval stage, then mature into an adult Ex: ?

3. Direct Development - no larval stage; at birth, animal already resembles adult form Ex: ? II. Vertebrates all have bilateral symmetry!! A. Body Support 1. Endoskeleton: internal skeleton that

supports large, heavy bodies B. Segmentation 1. All vertebrates are segmented somewhere on or in their bodies (ribs, vertebrae) C. Body Coverings Integument System

1. Aquatic Vertebrates: have moist skin which allows for gas exchange through the skin 2. Land vertebrates: skin is watertight 3. Feathers & Fur: expel water & insulate body D. Respiratory & Circulatory Systems 1. Respiratory: aquatic vert. use gills; land

vert. use lungs 2. Circulatory: closed system with a chambered heart E. Digestive & Excretory Systems 1. Digestive: have a gut running anterior to posterior

2. Excretion: converts ammonia to less toxic substance; filters blood through kidneys F. Nervous System 1. Brain & nervous tissue is organized into an efficient system.

G. Reproduction & Development 1. Embryos can develop in an egg outside mothers body or inside body in a uterus. 2. All vertebrates undergo direct development!

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