This document compares and contrasts the circulatory systems of fish, amphibians, and humans. Fish have a two-chambered heart and single circulation where deoxygenated blood flows from the heart to the gills and then the body before returning to the heart. Amphibians have a three-chambered heart and double circulation with one loop to the lungs and another to the body, but oxygenated and deoxygenated blood can mix. Humans have a four-chambered heart and double circulation where oxygenated and deoxygenated blood flows separately to and from the lungs and body.

1. Comparison
of
Fish, Amphibian
and
Human Circulatory System.
A Presentation on
Presented by
Inkiad Ahmed Himel
B.Sc Fisheries Hons.
4th year 1st semester (On going)
Faculty of Fisheries
Chattogram Veterinary and Animal Sciences University

2. What is Circulatory System?
ο The circulatory system, also called the
cardiovascular system or the vascular
system.
ο It is an organ system that permits
blood to circulate and transport
nutrients (such as amino acids and
electrolytes), oxygen, carbon dioxide,
hormones, and blood cells to and from
the cells in the body to provide
nourishment and help in fighting
diseases stabilize temperature and pH,
and maintain homeostasis.
Fig:Circulatory system in fish,
Amphibians and human

3. The circulatory system is
made up of three
components:
1. Fluid (blood)
2. Blood vessels (arteries,
veins, capillaries)
3. Pump (heart)
Which components make
circulatory system?

4. Circulatory system in fish
ο Fish have a closed circulatory system with
a heart that pumps blood around the body
in a single loop-from the heart to the
gills, from the gills to the rest of the
body, and then back to the heart.
ο Heart (2 chambers)
1 atrium: (Receives deoxygenated blood
from body,Receiving chamber, not pumping;
not muscular.
1 ventricle:
◊ Pumps blood out of heart to gills and
body.
◊ Pumping chamber
◊ Mascular
Fig:Circulatory system in fish

5. Drawbacks of fish circulation
ο One ventricle – that means one pump.
ο Only one pump to drive blood throughout body so
that blood travels less efficiently.
ο Relies on physical movement of the fish’s muscles
to assist blood in getting back to heart.

6. Fig:Circulatory system in amphibians
Circulatory system in amphibians
ο Amphibians have a closed
circulatory system that is broken
into two loops:
ο A new design to the heart which
have 3 chambers 1 Ventricle
(Pumping chamber); muscular and
2 Atria Receiving chambers.
1. Pulmonary circulation:
Blood is pumped from the
heart to the lungs & back to the
heart.
2. Systemic circulation:
Blood is pumped from the heart to
the rest of the body & back again.

7. ο Advantages
ο Disadvantages
Advantage and drawbacks of amphibians
circulation
◊ Double circuit – more efficient pumping
◊ 3 Chambers.
◊ Blood travels more efficiently .
◊ Mixing of oxygenated and deoxygenated
blood in the single ventricle

8. Circulatory system in Human
ο The human circulatory system consists
of a network of arteries, veins, and
capillaries, with the heart pumping
blood through it.
ο Human have four- chambered heart.
◊ Right and left atria.
◊ Right and left ventricles.
◊ The right and left ventricles are
separated by a muscular wall called the
septum.
◊ This prevents oxygen rich and oxygen
deficient blood from mixing.
Fig:Circulatory system in human

9. ο Heart Made up of two pumping
systems/circuits.
◊ Palmonary circulation.(heart to lungs
to heart)
◊ Systemic circulation.
(heart to body to heart)
ο Circulation Pathway
Vena Cava
Right atria
Right ventricle
Pulmonary artery
Lungs
Pulmonary vein
Left atria
Left ventricle
Aorta
Body
Circulatory system in Human
Fig:Circulatory system in human

10. 02 03
Fish
Amphibian Human
Basic Circulatory structure and System
01

11. Fish circulatory
system
Amphibian circulatory
system
Human circulatory
system
Their heart has one atrium
and one ventricle, means
their heart is two
chambered.
Their heart has two atrium
and one ventricle, means
their heart is three
chambered.
Their heart has two atrium
and two ventricle, means
their heart is four
chambered.
They have single
circulation.
They have double
circulation.
They have double
circulation.
Only deoxygenated blood
flows through their heart.
(Venous heart)
Both oxygenated and
deoxygenated blood flow
through their heart
Both oxygenated and
deoxygenated blood flow
through their heart
Oxygenated and
deoxygenated blood flows
separately in the body.
Oxygenated and
deoxygenated blood is
mixed and then flow
through the body.
Oxygenated and
deoxygenated blood flows
separately in the body.
Blood flows: Heart >
Gills > Body > Heart
Blood flows: Heart >
Lungs > Heart > Body >
Heart
Blood flows: Heart >
Lungs > Heart > Body >
Heart
Summary of This Presentation

12. “Good blood
always shows
itself.”
------Danish Wisdom
Thank you