The circulatory system transports nutrients, oxygen, and wastes throughout the body via blood vessels. Blood is pumped from the heart through arteries, then into capillaries where nutrients and oxygen are exchanged, and finally returns to the heart through veins. The circulatory system consists of the heart, blood, and blood vessels which work together to transport blood containing red blood cells, white blood cells, platelets, and plasma to all parts of the body.

1. BY
IBEKWE CHIGOZIE BLESSING

2.  The Circulatory System is responsible for
transporting materials throughout the entire
body.
 It transports nutrients, water, and oxygen to
your billions of body cells and carries away
wastes such as carbon dioxide that body cells
produce.
 It is an amazing highway that travels through
your entire body connecting all the body
cells

4.  Heart
 Blood
 Vessels
 Arteries
 Veins
 Capillaries

5.  Oxygen-rich blood
 Blood travelling to the
body cells.
 High oxygen content
 Oxygen poor blood
 Low carbon dioxide
content
 Blood travelling
away from the body
cells Low oxygen
content High
carbon dioxide
conten

6.  The inside of the heart is divided into two
sections so that the two types of blood
(oxygen-rich and oxygen poor) are kept
apart.
 Right side of the heart carries oxygen poor
blood.
 Left side of the heart carries oxygen rich
blood

7.  Heart coverings
 Pericardium : Covers the heart and large
blood vessels attached to the heart.
 Visceral pericardium : Innermost layer and
directly on the heart.
 Parietal pericardium: Layer on top of the
visceral pericardium

8. Epicardium
 Outermost layer
 Fat to cushion heart.
Myocardium
 Middle layer.
 Primarily cardiac muscle
Endocardium
 Innermost layer
 Thin and smooth
 Stretches as the heart pumps

9. The heart has Four chambers
 Two Atria
 Upper chambers
 Left and right Separated by interatrial
septum
 Two Ventricles
 Lower chambers
 Left and right
 Separated by interventricular septum

10.  The Atria collect blood that enters the heart,
 The ventricles pump blood out of the heart.

11.  The heart can pump blood because it is made
of muscle. Muscle tissue works by contracting
(squeezing) and relaxing.
 All the parts of the heart on either side,
work together in a repeated sequence.
 The two atria contract and relax; then the
two ventricles contract and relax.
 One complete sequence of contraction and
relaxation is called a heartbeat

12.  As blood moves through the circulatory
system it moves through 3 types of blood
vessels:
 Arteries: Carry blood away from the heart .
 Capillaries: Link arterioles to veins.
 Veins: Carry blood towards the heart

14.  Large vessels
 Carry blood from heart to tissues of body.
 Carry oxygen rich blood, with the exception
of pulmonary arteries.
 Thick walls-need to withstand pressure
produced when heart pushes blood into
them.

15.  Smallest blood vessels
 Walls are only one cell thick and very
narrow.
 Important for bringing nutrients and oxygen
to tissues and absorbing CO2 and other waste
products.

16.  Once blood has passed through the capillary
systems, it must be returned to the heart
thtough the veins.
 Walls contains connective tissue and smooth
muscle.
 Largest veins, contain one way valves that
keep blood flowing toward heart.
 Many found near skeletal muscles. When
muscles contract, blood is forced through
veins.

18.  Composed of plasma and blood cells.
 Types of Cells are:
 Red Blood Cells
 White Blood Cells
 Platelets
 Plasma : Straw colored , 90% water , 10%
dissolved gases, salts, nutrients, enzymes,
hormones, wastes, and proteins

19.  3 Types:
 Albumins, globulins and fibrinogen.
 Albumins and Globulins- transport substances
such as fatty acids, hormones and vitamins.
 Fibrinogen- Responsible for blood’s ability to
clot

20.  Most numerous type
 Transport oxygen
 Get color from hemoglobin
 Disk shaped
 Made in red bone marrow
 Circulate for 120 days

22.  Guard against infection, fight parasites, and
attack bacteria
 Number of WBC’s increases when body is
fighting
 Lymphocytes produce antibodies which fight
pathogens and remember them

24.  Aid the body in clotting
 Small fragments
 Stick to edges of broken blood cell and
secrete clotting factor to help form clot.

26.  Blood has 3 main Functions
 Transport
 Protection
 Temperature Regulation