The circulatory system, also known as the cardiovascular system, consists of the heart, blood vessels, and blood. It transports essential materials to cells and removes waste through two circulation routes: pulmonary circulation carries deoxygenated blood to the lungs to receive oxygen, and systemic circulation distributes oxygenated blood to all body tissues. The circulatory system is vital for cell function, immunity, waste removal, and maintaining homeostasis.

1. Circulatory System
 The Body’s
Transport System

2. The Circulatory System
 Consists of organs and
tissues that transport
essential materials to
body cells and remove
their waste products.
 This body system is
also known as the
CARDIOVASCULAR
SYSTEM.

3. How the Circulatory System Works
 Hormones from glands
help regulate cell
activity.
 Oxygen from the lungs
combines with
nutrients to provide
energy.
 Nutrients from the
digestive system
provide food for the
cells.

4. How the Circulatory System Works
 Germ fighters
(antibodies) from
different parts of the
body help to fight
infection and disease.
 Wastes are carried to
the liver and kidneys
for removal from the
body.
 Carbon Dioxide, a
waste gas, is carried
away and delivered to
the lungs, which
remove it from the
body.

5. Parts of the Circulatory System
 Heart: your heart
pumps blood
through two major
pathways.
 Blood Vessels
 Blood
 Pulmonary
Circulation: the
flow blood from the
heart to the lungs
and back to the
heart.
 Systemic
Circulation: is the
flow of blood to all
the body tissues
except the lungs.

6. The Heart
Consists of four chambers in which blood flows.
 Blood enters the R atrium
and passes through the right
ventricle.
 The R ventricle pumps the
blood to the lungs where it
becomes oxygenated.
 The oxygenated blood is
brought back to the heart by
the pulmonary veins which
enter the L atrium.
 From the L atrium blood flows
to the L ventricle.
 The L ventricle pumps blood
to the aorta which distributes
the oxygenated blood
throughout the rest of the
body.

7. Blood Vessels
Over 80,000 miles of blood vessels transport your blood throughout your
body. There are 3 types of blood vessels.
 Arteries: Blood
vessels that carry
blood away from
the heart to other
parts of the body.
 Veins: Blood
vessels that carry
blood from the
body back to the
heart.
 Capillaries: Tiny
tubes that carry
blood from the
arteries to the
body’s cells, and
then back to the
veins.

8. Arteries, Veins, and Capillaries

9. Blood: a mixture of solids in a large
amount of liquid called plasma.
 Plasma: is about
92% water. It
transports blood
solids, nutrients,
hormones, and
other materials.
 Red Blood Cells:
carry oxygen to
cells and carbon
dioxide away from
them.

10. Blood: a mixture of solids in a large
amount of liquid called plasma.
 White Blood Cells: help
fight disease and
infection by attacking
germs that enter the
body.
 Platelets: help blood
form a clot at the site
of a wound. A clot
seals a cut and
prevents excessive
blood loss.

11. Pulmonary Circulation
 Pulmonary circulation
transports oxygen-
poor blood from the
right ventricle to the
lungs where blood
picks up a new oxygen
supply. Then it
returns oxygen rich
blood to the left
atrium.

12. Systemic Circulation
 Systemic
circulation provides
a functional blood
supply to all body
tissue.
 It carries oxygen
and nutrients to
the cells.
 It picks up carbon
dioxide and waste
products.

13. Blood Pressure
As blood is moved through your body, it exerts pressure against
the walls of blood vessels.
 Systolic Pressure: as
your heart contracts to
push blood into your
arteries, your blood
pressure is at its
highest point.
 Diastolic Pressure: As
your heart relaxes to
refill, blood pressure is
at its lowest point.

14. Problems of the Circulatory System
 Hypertension: is a condition in which
blood pressure is consistently higher
than normal, which can lead to heart
attack, stroke, or kidney failure.
 Stroke usually results from blood
clots that block vessels in the brain,
or from the rupture of a blood vessel.
 Heart Attack is a blockage of the flow
of blood to the heart.

15. Problems of the Circulatory System
 Anemia is an abnormally low level of
hemoglobin, a protein that binds to
oxygen in red blood cells.
 Leukemia is a disease in which extra
white blood cells are produced.
 Hemophilia is a disease in which the
blood plasma does not contain
substances that help the blood to
clot.

16. Care of the Circulatory System
 Limit fat in your
foods.
 Get regular
physical activity.
 Avoid tobacco.
 Manage stress.

17. Critical Thinking
 Compare and
contrast. What are
systemic circulation
and pulmonary
circulation?
 Which one carries
newly oxygenated
blood?