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Class Mammalia Jess Ackerman Maddy Smith. Phylum name: Chordates Subphylum: vertebrata Class: mammalia Common Name: mammals.

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Presentation on theme: "Class Mammalia Jess Ackerman Maddy Smith. Phylum name: Chordates Subphylum: vertebrata Class: mammalia Common Name: mammals."— Presentation transcript:

1 Class Mammalia Jess Ackerman Maddy Smith

2 Phylum name: Chordates Subphylum: vertebrata Class: mammalia Common Name: mammals

3 General Characteristics Hair (insulation and protection) Sweat glands – Mammary glands (produce milk for young) Differentiation of teeth (incisors, canines, premolars, molars) 3 middle ear bones (malleus, incus, stapes) Jaw (composed of dentary and squamosal) Endotherms (constant body temperature) Complex nervous system Bilateral Symmetry

4 Various Body Systems System TypeMammals System Muscular-Skeletal A mammal has an inner skeleton. It has developed muscles and generally have four limbs attached. Digestion A mammal has a developed digestive tract with mouth, teeth, stomach, intestines. Herbivores eat plants, carnivores eat meat and omnivores eat both. Nervous A mammal has a highly developed brain, nerves and sensory organs such as eyes, nose, mouth, ears and touch. Circulation A mammal has a four chambered heart, blood vessels and blood within their system. Respiration A mammal has lungs and breathes in oxygen and gives off carbon dioxide. Reproduction A mammal reproduces sexually with the female being fertilized by the male internally. Mammals have live birth and care for their young for quite a time after birth. Excretion A mammal gas kidneys and is covered with skin. The skin has hair. Mammals are warm blooded. SymmetryA mammal has bilateral symmetry. Coloration A mammal can be various shades of brown, black, tan, white.

5 Anatomy: Skeletal System Internal skeletal system Seven cervical vertebrae (normally) Four limbs (usually); limbs adapted for: – climbing – swimming – flying – running/walking

6 Anatomy: Respiratory System and Gas Exchange Take in oxygen, expel carbon dioxide Lungs: – Spongy texture – Epithelium (larger surface area) Muscular Diaphragm: – Drives breathing – Divides thorax from abdominal cavity Air enters through oral and nasal cavities Flows through larynx, trachea, and bronchi Air is sucked into or expelled out of lungs – Moves down pressure gradiant – Aka bellows lungs Red blood cells serve as oxygen transports Four chambered heart pumps blood throughout body

7 Anatomy: Integumentary System Three layers: epidermis, dermis, hypodermis Epidermis: – Ten to thirty cells thick – Provides waterproof layer – Outermost cells constantly lost – Bottommost cells constantly dividing Dermis: – Fifteen to forty times thicker than epidermis – Components include bony structures and blood vessels Hypodermis: – Made of adipose tissue – Stores lipids – Provides cushioning and insulation Hair

8 Anatomy: Nutrition and Digestion Keeping high constant body temperature is energy expensive Need nutritious and plentiful diet Different species adapted to dietary requirements in a variety of ways – Carnivores (including insectivores) – Herbivores (granivores, folivores, fruivores, nectivores, etc.) Size of animal is a factor in diet type – Small: high-energy requirements – Large: can tolerate slower collection process or slower digestive process Developed digestive tract –Mouth, teeth, esophagus, stomach, intestines

9 Response to Stimuli Eyes – Respond to light, movement, etc. Ears – Responsible for hearing and balance Nervous System – Complex brain (neocortex) – System of nerves throughout the body

10 Anatomy: Reproductive System Most are vivipary (live young) – Metatheria – Eutheriaplacental mammals – Marsupialsundeveloped young kept in pouch A few lay eggs – Holotheria (monotremes) Mammary glands – Specialized to produce milk – Newborns primary source of nutrition

11 Classes: 3 subclasses Holotheria (monotremes, egg laying mammals) Metatheria (marsupials, pouch mammals) Eutheria (placental mammals)

12 Holotheria Ex: duck billed platypus, spiny ant eaters Reproduction: females lay eggs, or carry in pouches Feeding practices: varied (ant eaters use sticky tongue, platypus eats freshwater invertebrates, etc.)

13 Metatheria Ex: kangaroos and opossums Reproduction: young are born in undeveloped stage, complete development in pouch Feeding practices: varied

14 Eutheria Ex: humans, lions, etc. Reproduction: young remain in mothers until development is complete Feeding practices: varied

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