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Circulatory System

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Title: Skeletal and Muscular Systems Author: Administrator Last modified by: Rutherford County Schools Created Date: 4/3/2008 7:55:59 PM Document presentation format – PowerPoint PPT presentation

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Date added: 18 November 2019
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Title: Circulatory System


1
Circulatory System
2
The Circulatory System
  • The circulatory, or cardiovascular, system is
    made up of the heart, blood vessels, and blood.
  • In one day, human hearts beat about 100,000 times
    and pump around 1,500 gallons of blood!

Whew! Im tired!
3
What does it do for us?
  • Our circulatory system
  • Delivers necessary materials (like oxygen and
    sugar) to the entire body in the blood,
  • Removes waste products from cells, and
  • Helps fight disease by transporting immune cells
    in the blood.

4
How does it move stuff?
  • The circulatory system is like a system of roads
    that links your entire body
  • The roads are blood vessels some are like
    superhighways, and others are like small one-lane
    paths.
  • Your blood travels on these roads like a mail
    man it both delivers and picks up important
    materials.

5
How does it move stuff?
  • Your blood travels in two main loops
  • From the heart to the lungs and back, and
  • From the heart to the body and back.

6
How does it move stuff?
  • Basically, your blood follows this cycle

Blood gets rid of carbon dioxide and picks up
oxygen.
Blood enters the right side of the heart and is
pumped out again.
Blood enters the left side of the heart and is
pumped out again.
Blood delivers oxygen to body and picks up waste
(like carbon dioxide).
7
Oxygen-poor blood from the body enters the right
side of the heart and is pumped out to the lungs.
Oxygen-rich blood from the lungs enters the left
side of the heart and is pumped out to the body.
8
How does it move stuff?
  • Your heart is the pump that sends the blood
    through the system.
  • The heart is a hollow, muscular organ.

RIGHT ATRIUM
LEFT ATRIUM
LEFT VENTRICLE
RIGHT VENTRICLE
  • Inside the heart, there are four main chambers
    two atria (right and left) and two ventricles
    (right and left).

9
Whats inside your heart?
SEPTUM
  • The right and left sides of the heart are
    separated by a wall of tissue called the septum.

10
Whats inside your heart?
VALVE
VALVE
  • The atria and ventricles are separated by valves,
    which prevent blood from flowing in the wrong
    direction.
  • The atria receive the incoming blood, and the
    ventricles pump it back out, either to the lungs
    or to the body.

11
So, the detailed path of blood in your body would
look like this
  • From Body
  • Right Atrium
  • Right Ventricle
  • To Lungs
  • From Lung
  • Left Atrium
  • Left Ventricle
  • To Body

Lung
Body
12
Whats inside your heart?
  • The ventricles are in charge of pumping the blood
    out to the entire body. They need to be thick and
    strong to have enough force!
  • This is a real sheep heart. Look at how thick the
    walls of the ventricles are. Why is this?

13
Heart Facts
  • Hold out your hand and make a fist. If you're a
    kid, your heart is about the same size as your
    fist, and if you're an adult, it's about the same
    size as two fists.
  • Your heart beats about 100,000 times in one day
    and about 35 million times in a year. During an
    average lifetime, the human heart will beat more
    than 2.5 billion times.
  • Give a tennis ball a good, hard squeeze. You're
    using about the same amount of force your heart
    uses to pump blood out to the body. Even at rest,
    the muscles of the heart work hard--twice as hard
    as the leg muscles of a person sprinting.

14
What carries the blood?
  • BLOOD VESSELS are the hollow tubes that carry
    your blood around your body.
  • There are 3 TYPES
  • ARTERIES
  • CAPILLARIES
  • VEINS

15
What carries the blood?
  • Arteries carry blood away from the heart.
  • They are very thick, and have strong, muscular
    walls to withstand the pressure created by the
    heart.

16
What carries the blood?
  • Capillaries are tiny vessels that run through
    your body tissue.
  • They are very thin to allow oxygen and waste to
    pass between the vessels and your cells.

17
What carries the blood?
  • Veins carry blood back to the heart.
  • They have thinner walls than the arteries because
    there is not as much pressure from the heart.

18
  • This vast system of blood vessels - arteries,
    veins, and capillaries - is over 60,000 miles
    long. That's long enough to go around the world
    more than twice!

19
What is your blood?
  • Blood is not one single substance it is a mix
    of liquid and cells.
  • The liquid part of blood is called plasma. It is
    mostly water.
  • The rest of the blood is made of three types of
    cells.

20
Is Blood Blue?
  • Your veins are not actually blue. They are a dark
    reddish-brown, but appear blue because the fat
    under our skin only allows blue light to travel
    all the way down to our veins. Since it is the
    only color of light that makes it to our veins,
    it is the only color that is reflected, and thus
    our veins appear blue! I hope this helps
  • Everyone's skin is slightly different in color,
    so the veins can look different in different
    people, but blood is exactly the same color in
    everyone. It still doesn't look red. That's
    because we're seeing the walls of the veins
    too.

21
What is your blood?
Red Blood Cells carry oxygen.
White blood cells fight disease.
Platelets form blood clots to stop you from
bleeding too much.
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