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Circulatory System
in Animals
Regents Biology
2008-
Feeding Energy Needs
 Why do we need a
circulatory system?

supplies in
 _______________________
 ______________________
 _______________________
 ______________________

waste out
 _______________________
 ______________________

need to pick up & deliver
the supplies & wastes
around the body
Regents Biology
 _______________________
Circulatory System
 Organ

______________
 Tissues & cells

______________
 ______________
 ______________
 ______________

______________
 ______________
 ______________
Regents Biology
Vertebrate Heart
 4-Chambered heart

____________ (atrium)
 ____________________
left
atrium
 collection chamber
 receive blood

__________________
right
atrium
 ____________________
 pump blood out
Regents Biology
right
ventricle
left
ventricle
Evolution of circulatory system
Not everyone has a 4-chambered heart
fish
2 chamber
V
amphibian
3 chamber
A
A
A
V
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reptiles
3 chamber
A
V
A
V
birds & mammals
4 chamber
A
V
A
V
Lub-dub, lub-dub
 4 valves in the heart


flaps of connective tissue
___________________________
 Heart sounds


___________________________
“Lub”
SL
AV
AV
 force blood against
closed AV valves

“Dub”
 force of blood against
semilunar valves
 Heart murmur
_________________________________________
 blood squirts backward through valve
Regents Biology

Electrical signals
allows atria to empty
completely before
ventricles contract
stimulates ventricles
to contract from
bottom to top, driving
blood into arteries
 heart pumping controlled by electrical impulses
Biology
 Regents
signal
also transmitted to skin = ________
atria empty
into ventricles
Cardiac Cycle
How is this
reflected in
blood pressure
measurements?
chambers begin
to fill
pump (peak pressure)
__________________
fill (minimum pressure)
110
______
80
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ventricles
pump
Measurement of blood pressure
hypertension =
(high
blood pressure)
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if top number > 150
or
if bottom number > 90
Have a heart?
Ask Questions!!
Regents Biology
2006-2007