Transcript MAMMALS - Fox Valley Lutheran High School

MAMMALS
MAMMAL’S CHARACTERISTICS
Warm blooded
Hair/fur
Subcutaneous fat
Sweat glands
Viviparous- gives birth to live young who develop inside the female
Feed young with milk produced in the mammary glands
Teeth that fit their feeding/eating habits
A well developed respiratory system and a four chamber heart
EVOLUTION OF MAMMALS
endothermic and ectothermic
Monotremes: Egg laying mammals- duckbill platypus and spiny anteater
Marsupials: Young develop inside a pouch- kangaroo, opossum
Placental Mammals: Young develop inside female
FORM & FUNCTION
FEEDING
Teeth made to fit eating habits
Sharp claws on feet
Bodies built for sudden bursts of speed
Produce bursts of sound waves to stun nearby fish
Rumen: part of the digestive tract for animals to digest cellulose
“Chewing their cud” fig. 33-6
Cecum: dead-end sack of some herbivores (rabbits) to digest cellulose
Vampire bats, Blue whale (baleen)
RESPIRATION
Use lungs powered by two sets of muscles; diaphragm
INTERNAL TRANSPORT
A circulatory system w/ a 4-chambered heart & lungs to bring oxygen
FORMS & FUNCTION
EXCRETION
Highly developed kidneys to extract nitrogenous & other wastes
Excrete or retain excess liquids, salts, sugars, & other compounds
RESPONSE
Brains developed w/3 parts: cerebrum, cerebellum, and medulla
Cerebrum- complicated behaviors, thinking & learning
Cerebellum- coordinates movement
Medulla- regulates body functions such as breathing & heart rate
Highly developed senses
Eyes: color and black and white
Ears set for different frequencies
Smell and Taste
Protection- Herbivores and Carnivores
FORM & FUNCTION
REPRODUCTION
Monotremes reproduce much like reptiles
Oviparous: female lays eggs and incubated outside mom’s body, but
after the young hatch, mom feeds milk produced by mammary glands
Marsupials are viviparous and bear live young. But yolk sac inside mom
isn’t enough to nourish through development, so young are born very
premature and must finish development inside the pouch (marsupium)
Placentals are nourished much longer inside the womb by a placenta.
Nutrients, oxygen, co2, and wasted are exchanged through the placenta.
Gestation period is the time the embryo stays inside the uterus.
Ranges from a few weeks (mice) to two years (elephant)
The amount of time spent after birth with the parents vary from specie to
specie. Why????