The document discusses the function of the heart, providing facts about how many times it beats in a day and gallons of blood it pumps in a lifetime. It explains that the heart functions like a pump to send oxygen-rich blood through the entire body, carrying oxygen and nutrients needed for all cells to survive. It also gives an overview of circulatory systems in fish, amphibians, and mammals, noting differences like amphibians having a double circulatory system but not always a completely separated two-pump heart, while fish have a two-chambered heart that pumps blood to the gills first before the rest of the body.

1. Understanding
the Heart
By: Nava Behnam and
Lauren Emanuel
1

2. Did You Know?
In one day, your heart
beats more than 100,000
times and pumps more
than 4,300 gallons of
blood. In an average lifetime, your
heart pumps about
100,000,000 gallons of
blood.
For more interesting facts, go to:
http://facts.randomhistory.com/human-heart-facts.html 2

3. Function of the Heart
Carbon- Oxygen
Dioxide
Functions like a pump
to send oxygen-rich
blood through all
parts of your body.
Blood contains
oxygen and nutrients
that every cell in your
body needs to 3
survive.
3

4. Overview of Circulatory
Systems
4
Fish Amphibians Mammals
4

5. Amphibians
• Double circulatory system, but the
heart is not always completely
separated into two pumps.
Three chambered heart
5

6. Fish
The two-
chambered
heart pumps
blood to the
gills.
From there, it
pumps the blood
to the rest of the
body.
6