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CH 32 Foldable Mammals
1-Hair
2-Ability to nourish young with milk
(In female mammals, MAMMARY
GLANDS produce milk for the young)
3-Breath air
4-Have 4-chambered hearts
5-Are Endotherms (generate their body
heat internally)
Because of its high metabolic rate, a
mammal has to eat 10 times as much
food as a reptile of the same size to
maintain homeostasis.
All mammals, even those living in
water, use lungs to breath.
The mammalian circulatory system is
divided into two completely separate
loops with a 4-chambered heart. One loop
from the lungs…the other from the body.
Mammals have the most highly developed
brains of any animals.
A flexible backbone allows mammals to
move both vertically & from side to side.
Mammals reproduce by internal
fertilization. The male deposits
sperm inside the female
reproductive tract, where
fertilization occurs.
Monotremes are egg-laying mammals.
Only three species exist today: duckbill
platypus, & two species of spinyanteaters.
Marsupials are pouched mammals. They
bear live young that usually complete
their development in an external pouch.
Placental mammals (like humans, cats, dogs…)
get their name from an internal structure called
the PLACENTA. The placenta allows the
exchange of materials (nutrients, oxygen, carbon
dioxide, wastes) between the embryo & its
mother. The placenta allows the embryo to
develop a much longer time inside the mother’s
body-from a few weeks in mice to two years for
an elephant.
There are 12 orders of placental mammals.
Humans are in the Primate Order.
Characteristics of all primates are:
1-Binocular Vision
2-a well-developed cerebrum
3-relatively long fingers & toes
4-arms that can rotate around their shoulder
joints.
The scientific name for humans is: Homo sapien