External Respiration & Circulatory
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Circulatory and Respiratory systems work together
to oxygenate blood and move it around the body
Gas exchange happens in the alveoli of the lungs
Aquatic animals use gills or diffusion; terrestrial
use lungs
We have a closed, double-loop circulatory system!
Immune System uses circulatory to move
antibodies and defense materials (like white blood
cells) around the body.
Extracellular Digestion & Excretion
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Involve Digestive Tracts: a tube
with two openings
Food moves in one direction
Chemical AND mechanical
breakdown:
 Ingestion,
Digestion, Absorption,
Secretion
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Blood is also filtered through
kidneys and excreted as urine.
Accessory
Organs:
Liver, Pancreas,
and Kidneys!
Muscular & Skeletal
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Endoskeleton
Protects soft internal organs and provides jointed
frame
Skeletal muscles attach to bone to help with
movement
3 types of muscle: smooth (digestive system),
skeletal (leg and arm muscles), and cardiac (heart)
Reproductive
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Sexual reproduction
 Genetic
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diversity!
Internal fertilization
Viviparous
Teste and Ovaries – production of gametes
Endocrine system (hormones) plays a role!