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Biology 2601A/B Lecture Notes - Circulatory System, Jellyfish, Heart

Course Code
BIOL 2601A/B

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Org Phy Lect
Oct 11
Circulation: pressure driven bulk flow of fluid
5L of blood, we pump that 5L every minute
huge amount of work for your entire life
think of your heard as 2 hesrts in 1: right heart pumping your used blood and your
left heart returning it back (?)
circulatory system from Wikipedia
“most primpitive… lack circulatory systems” = NOT TRUE.
Purple sponge pic
Hard to think of animals that don’t have some means of flow of water
A sponge is essentially a pump
Every 5 seconds will pump the volume of its body size through its system
Outgoing water shoots out the top and incoming water comes though entire body of
the animal through little pores (utilizes for feeding and getting oxygen to entire
Single flagellum of pilanocyte (sp?) drives the movement of water (polanocyte is the
cells of the sponge)
Someone injected dye into a sponge and above the sponge you can see a big plume
of dye (the sponge release their sperm into the water this way)
Glowing jelly fish thing
Pimitive area
Transparent, no heart or pumping organs
If we look closely at this animal, from each portion is a whole series of canals, this is
to get thr fluid throughout the animals system
(get quite large)
move fluid around their system by cilia
fig 24.3
we see that vertebrates have hearts, pumps, circulatory systems, etc.
insects have a pump system and an open circulatory system
sponges have a kind of circulatory system
jellyfish have circulatory systems (driven by individual cells, not a pump)
molluscs brachial and systemic heart
rotifers are one of the tiniest animals (fresh water systems) have a circulatory
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