Transcript Document

Circulatory System
in Animals
Regents Biology
2006-2007
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
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 _______________________
Simpler organisms
When your body is only 2-cell layers thick, you can get
supplies in and waste out just through ______________

all cells within easy reach of fluid
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Biology
Jellyfish
Hydra
Complex organisms
 Circulatory system

made up of 3 parts
 organ
 _________________
 tissues & cells
 _________________
_____________
 _____________
 _____________
 _________________
 _____________
 _____________

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Circulatory systems
 All animals have:
muscular pump = ________________
 tubes = ________________
 circulatory fluid = ________________

open
hemolymph
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closed
blood
Vertebrate Heart
 4-Chambered heart

____________ (atrium)
 ____________________
left
atrium
 collection chamber
 receive blood

__________________
right
atrium
 ____________________
 pump blood out
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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
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
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 = ________
Cardiac Cycle
ventricles
fill
How is this
reflected in
blood pressure
measurements?
systolic
________
diastolic
chambers fill
110
pump
(peak pressure)
_________________ ________
80
fill
(minimum
pressure)
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Biology
ventricles
pump
Measurement of blood pressure
if systolic > 150
hypertension =
or
(high blood pressure)
if diastolic > 90
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Have a heart?
Ask Questions!!
Regents Biology
2006-2007