Transcript The Circulatory System of Humans

The Circulatory System
of Humans
What is that ‘lub
dub, lub, dub’
noise in my chest?
The noise is the
sound of your
heart as it pumps
blood.
The heart
• Your heart pumps blood
all the time to all parts
of your body.
• Your heart is made of
heart muscle.
• The heart muscle
contracts and relaxes
continuously.
• You cannot control your
heart muscle.
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The heart
Blood vessels
• Blood vessels are tubes which carry blood
to different parts of your body.
• There are 3 types of blood vessels:
– artery
– vein
– capillary
Blood vessels


Arteries carry
blood
– rich in oxygen
– from your heart to
all parts of your
body
Veins carry blood
– rich in carbon
dioxide
– back to the heart
Artery
Capillaries
Vein
Blood vessels

Capillaries
– have very thin
walls
– allow oxygen,
digested food,
water, carbon
dioxide and waste
materials to pass
through their walls
Artery
Capillaries
Vein
Circulatory system
• Your heart, blood vessels and blood form
the parts of the circulatory system.
• The circulatory system circulates blood
from your heart to all parts of your body
and back again.
Blood circulation
upper body parts
lungs
flow of blood rich
in oxygen, digested
food and water
flow of blood rich in
carbon dioxide and
waste materials
heart
lower body parts
What is the Heart and what it does
The heart is an organ
that is made of a
special muscle called
the heart muscle.
The heart muscle
contracts and relaxes
repeatedly without rest!
What causes blood flow?
• By contracting, the heart
muscle squeezes blood
out of the heart into
thick-walled blood
vessels This causes
vessels.
blood to flow to all parts
of our body.
• By relaxing, heart
muscle makes blood flow
back into heart from
thin-walled blood
vessels
vessels.
Blood Circulation: Step 1
• Your heart pumps
oxygen-rich blood to all
cells of your body.
• Your body cells use the
oxygen, digested food
and water from the blood
to produce energy.
Blood Circulation: Step 1
from
lungs

Your heart pumps
oxygen-rich blood to
all cells of your body.

Your body cells use
the oxygen, digested
food and water from
the blood to produce
energy.
Blood Circulation: Step 1

Your heart pumps
oxygen-rich blood to
all cells of your body.

Your body cells use
the oxygen, digested
food and water from
the blood to produce
energy.
Blood Circulation: Step 1 to the
body

Your heart pumps
oxygen-rich blood to
all cells of your body.

Your body cells use
the oxygen, digested
food and water from
the blood to produce
energy.
Blood Circulation: Step 2

As blood goes around
your body, it picks up
carbon dioxide and waste
materials.

On its way back to your
heart, blood passes the
waste materials to the
excretory organs like your
kidneys and liver.
I’ve passed the
waste to the
kidneys and liver.
Blood Circulation: Step 2

As blood goes around
your body, it picks up
carbon dioxide and waste
materials.

On its way back to your
heart, blood passes the
waste materials to the
excretory organs like your
kidneys and liver.

When blood reaches your
heart again, it is sent to the
lungs where carbon
dioxide is removed.
Next, to remove
the carbon
dioxide.
Blood Circulation: Step 2

As blood goes around
your body, it picks up
carbon dioxide and waste
materials.

On its way back to your
heart, blood passes the
waste materials to the
excretory organs like your
kidneys and liver.

When blood reaches your
heart again, it is sent to the
lungs where carbon
dioxide is removed.
Blood Circulation: Step 2

As blood goes around
your body, it picks up
carbon dioxide and waste
materials.

On its way back to your
heart, blood passes the
waste materials to the
excretory organs like your
kidneys and liver.

When blood reaches your
heart again, it is sent to the
lungs where carbon
dioxide is removed.
Blood Circulation: Step 2

As blood goes around
your body, it picks up
carbon dioxide and waste
materials.

On its way back to your
heart, blood passes the
waste materials to the
excretory organs like your
kidneys and liver.

When blood reaches your
heart again, it is sent to the
lungs where carbon
dioxide is removed.
Blood Circulation: Step 2

As blood goes around
your body, it picks up
carbon dioxide and waste
materials.

On its way back to your
heart, blood passes the
waste materials to the
excretory organs like your
kidneys and liver.

When blood reaches your
heart again, it is sent to the
lungs where carbon
dioxide is removed.
To the
lungs
Heartbeat
•
Each heartbeat is a cycle of
contraction and relaxation of our
heart muscle.
•
As heart muscle contracts and
relaxes, it produces repeated
sounds - "lub dub", "lub dub",
"lub dub" ...
“Lub” sound
“dub” sound
Blood is squeezed out of
the ventricles (that is, the
lower chambers of the
Blood flows into the
ventricles
Pulse, Pulse rate and how to
measure it
•
Contraction and relaxation of heart
muscle causes pressure along our
blood vessels to rise and fall - this is
known as Pulse.
•
After every heartbeat, a pressure wave
passes along your blood vessels.
•
By pressing your fingers against your
wrist, you can feel your pulse.
•
The number of times pulse occurs
in one minute is known as Pulse
Rate.
•
You can obtain pulse rate by
counting the number of times
pulse occurs in one minute.
Press your fingers
gently against
your wrist.
The rate of your heartbeat
changes with:

age
 health
BABY
ADULT
About 120 times
per minute
About 70 - 90 times
per minute
The rate of your heartbeat changes
with the type of activity you are doing

When you exercise,
your heart rate
increases.
The heart needs to
supply more food and
oxygen to various
parts of the body to
produce more energy.
Fast
Slow