The circulatory system consists of the heart, blood vessels, and blood. It circulates blood through two loops - one for oxygenated blood and one for deoxygenated blood. The heart pumps blood through arteries, veins, and capillaries which transport oxygen, nutrients, waste products, and more throughout the 100,000 km network in the body. Key organs include the heart, which acts as the pump with four chambers, and a variety of blood vessels which carry blood between the heart and tissues. Blood contains plasma, red blood cells, white blood cells, and platelets which perform critical functions.

1. CIRCULATORY SYSTEM
NAME – PRATISHTHA SHRIVASTAVA
CLASS-5B
ROLL NO -18
SCHOOL-OXFORD WORLD SCHOOL

2. TABLE OF CONTENTS
• Human Circulatory System
• Features
• Organs of Circulatory System
1.Heart
2.Blood Vessels
3.Blood

3. HUMAN CIRCULATORY
SYSTEM
• The human body is a complex machine,
requiring many processes to function
efficiently. To keep these crucial
processes running without any hitches,
vital elements and components need to
be delivered to the various parts of the
body.
• This role of transportation is undertaken
by the human circulatory system, moving
essential nutrients and minerals
throughout the body and metabolic waste
products away from the body.

4. FEATURES OF CIRCULATORY SYSTEM
• The human circulatory system consists of blood, heart, blood vessels.
• It circulates blood through two loops (double circulation) – One for oxygenated blood,
another for deoxygenated blood.
• It consists of four chambers – two ventricles and two auricles.
• It possesses a body-wide network of blood vessels. These comprise arteries, veins, and
capillaries.
• The primary function of blood vessels is to transport oxygenated blood and nutrients to all
parts of the body.
• Most circulatory system diagrams do not visually represent its sheer length. Theoretically, if
the veins, arteries, and capillaries of a human were laid out, end to end, it would span a
total distance of 1,00,000 kilometers (or roughly eight times the diameter of the Earth).

5. ORGANS OF CIRCULATORY SYSTEM
• HEART
• The heart is a muscular organ that acts as
the pump of the circulatory system.
• It has four chambers: two atria (upper
chambers) and two ventricles (lower
chambers).
• The right side of the heart receives
deoxygenated blood from the body and
pumps it to the lungs for oxygenation. The
left side receives oxygenated blood from
the lungs and pumps it to the rest of the
body.
• BLOOD VESSELS
• Arteries: Carry oxygenated blood away
from the heart to various parts of the body.
The largest artery is the aorta.
• Veins: Transport deoxygenated blood from
the body back to the heart. The superior
and inferior vena cava are the largest
veins.
• Capillaries: Tiny, thin-walled vessels that
connect arteries and veins, allowing for the
exchange of nutrients, oxygen, and waste
products with tissues.

6. ORGANS OF CIRCULATORY SYSTEM
• BLOOD
• Blood is a fluid connective tissue that circulates throughout the circulatory system.
• Plasma: The liquid component of blood that carries water, nutrients, hormones, and
waste products.
• Red Blood Cells (Erythrocytes): Contain hemoglobin and transport oxygen from the
lungs to the rest of the body.
• White Blood Cells (Leukocytes): Play a crucial role in the immune system, defending
the body against infections.
• Platelets: Fragments of cells involved in blood clotting and wound healing.