Download The Circulatory System - Monroe

Pumping blood all over your body…

Take your first two fingers and hold them
out and together, like this:

You can take your pulse
on your wrist or directly
under your jaw.

When I say “Go!” start counting the number
of times that you feel your pulse beat.

This is how fast your heart is beating
while you are resting.
 Which activities do you think exemplify a
resting state?
 SHARE!

A normal resting heart rate is between 60
and 80 beats per minute.

Write down this number!

Now we will jog in place for 20 seconds
and take our heart rate again.
 But first, let’s hear some hypotheses! What do
you think will happen to our heart rates?

Start jogging again when I say so…

Why do you think this happened?

Remember from the respiratory system
that your body needs what two elements
in order to create energy?
 Oxygen and glucose

And how does your body make sure that
both of these elements get where they
need to be?
 The circulatory system carries them along.

What can we say about why our heart
would pump faster when we are
exercising?
 Good! Our bodies need more energy, so they
need more oxygen and glucose and in turn our
heart pumps harder to get them there.

1) The circulatory system carries needed
substances (oxygen and glucose) to cells

2) And carries waste products (carbon
dioxide and urea) away from cells.

Think of the circulatory system as a
“highway” where cars are red blood cells.

Your heart is a hollow, muscular organ
that pumps blood throughout the body.
 It DOES NOT make blood.

Each time your heart beats, it pushes
blood through the blood vessels of your
circulatory system.

The heart beats continually throughout a
person’s life resting only between beats.

During your lifetime your heart may beat
over three billion times.

In one year, it pumps enough blood to fill
over 30 competition-size swimming pools.
Your heart has 4
chambers:
•2 Atria (singular
atrium)
•2 Ventricles
(singular ventricle)
•Atria on top
(Arrows point up)
•Ventricles on
bottom
(Arrows point down)
We distinguish
between the two
atria and two
ventricles by
calling them
right and left.
REMEMBER– The
right and left
refer to YOUR
right and left. As
if the heart was
in your own
chest.
The septum is a
thick, muscular
wall that
separates the
right and left
sides of the
heart.
The septum
separates the
heart
A valve is a flap
of tissue that
prevents blood
from flowing
backward.
They separate
the atria and the
ventricles and
are also found in
large blood
vessels.
Right
Atrium
Right
Ventricle
Left
Atrium
Left
Ventricle




We already know that the heart is made
of cardiac muscle.
We also know that muscles need to work
in pairs.
The heart relaxes and contracts to do its
work.
When the heart relaxes, the heart fills up
with blood. When it contracts, the heart
pumps blood forward.

http://www.ehc.com/vbody.asp

Pacemaker – a group of cells which is
located in the right atrium which sends
out signals that make the heart muscle
contract.

A pacemaker is also a small electrical
device used to control abnormal
heart rhythms.

Arteries– Blood vessels that carry blood away
from the heart.
 ARTERY = AWAY!!!

Arthrosclerosis is a
condition in which
fatty material collects
along the walls of
arteries.

Veins – Blood vessels that carry blood into
the heart
 VEINS = IN !!

Capillaries– Tiny vessels where substances
( oxygen and carbon dioxide ) are
exchanged

Vena Cava – the vein that brings oxygen poor
blood into the heart.

Aorta – the artery that brings oxygen rich
blood away from the heart.

Pulmonary Vein – brings oxygen rich blood
from the lungs and into the heart.

Pulmonary Artery – brings oxygen poor blood
away from the heart and into the lungs.

PULMONARY MEANS LUNGS!!!