Circulatory System Notes

2.  This system is responsible for delivering
nutrients absorbed by the digestive system to
each cell in your body.
 It is your bodies transportation network.
 It also is responsible for delivering the
oxygen and wastes created by the respiratory
system.

3.  Your circulatory system acts similar to the a
highway interchange;
◦ Your body has different routes to take to reach
different areas
◦ Oxygen-rich blood flows one way, CO2 rich blood
travels the other
◦ There are larger systems closer to the main area
than the remote areas of the body

5.  The most important part of the system
 The heart is A PUMP, did you know it is
actually two pumps?
 The right and left side are each a separate
pump that work together

7.  The right side of the heart pumps blood to
your lungs
◦ Here it receives fresh oxygen and gives CO2
 The left side of your heart receives this
oxygen-rich blood from your lungs and
pumps it to all the rest of your body
 The blood returns to the right side to begin
all over again

9.  There 2 atriums and 2 ventricles in the heart
Atriums
 Receive blood from veins
◦ Right Atrium – receives blood low in oxygen from
the body and pumps it into the right ventricle
◦ Left Atrium – Receives oxygen-rich blood from the
lungs and pumps it into the left ventricle

10. Ventricles
 Are the bottom two chambers of the heart
that receive blood from the atriums
 Pushes blood out through arteries
◦ Right Ventricle – when it contracts it pumps blood
to the lungs
◦ Left Ventricle – When it contracts it pumps blood to
the body

12.  The aorta is a three hole artery that carries
the blood from the heart to the entire body
 This is the major tube that carries all of the
bodies blood to the areas that need it

15.  Made up of 3 of the 4 types of tissue;
◦ Connective on the outside (Tough)
◦ Muscle in the middle (Very strong and elastic)
◦ Epithelial on the inside

16.  Inside the body there is an intricate network
of blood vessels
 These vessels are about 100,000km in length
if completely stretched out

18.  Inside the body the blood vessels that are
responsible for carrying blood away from the
heart.
 These blood vessels are called ARTERIES.
 They carry blood from the heart to both the
lungs and the rest of the body

19.  Have a thick muscular layer in the middle that
expands and contracts to help push blood
along
 When you feel the expansion of the arteries
this is commonly known as PULSE

21.  Inside the body the blood vessels that are
responsible for carrying blood towards the
heart.
 These blood vessels are called Veins.
 They carry blood from rest of the body and
the lungs to your heart

22.  Veins are thinner than arteries, and have
valves that stop the blood from flowing
backwards

24.  Are tiny blood vessels whose purpose is the
diffusion of nutrients and gases
 Are located between arteries and veins
 They have two adaptations;
◦ 1) Epithelial tissues that are only one cell thick
◦ 2) Are very narrow so that blood cells have to pass
through single file

25.  Diffusion -- transports oxygen from your
blood into your cells, and carbon dioxide
from your cells into your blood
 Osmosis – Transports water in and out of the
blood cell

27.  Is the second largest example of connective
tissue
◦ (bones are the largest)
 Blood is composed of;
◦ Red Blood Cells
◦ White Blood Cells
◦ Platelets (tiny cells)
◦ Plasma (liquid portion)
 Plasma makes up 55% of blood, everything else
makes up 45%

28.  High specialized in order to perform their
function
◦ Function is to carry oxygen
 RBC’s do not have a nuclei, therefore have
more room for oxygen
◦ Are extremely flexible – can bend and twist through
the small capillary spaces

30.  Specialized cells to fight infection
 Some are capable or eating bacteria at
infection sites such as cuts

32.  Are cells that help to stop the bleeding at
cuts
PLASMA
 The liquid portion of your blood, transports
nutrients to your cells and carries
wastes, such as carbon dioxide, away

34.  http://www.youtube.com/watch?v=gg7FuKqK
Y4E