The document provides an overview of the major human body systems. It discusses 12 key systems: circulatory, respiratory, skeletal, nervous, integumentary, digestive, excretory, muscular, immune, endocrine, reproductive, and lymphatic. For each system, it outlines the main organs and functions. The goal is to explain at a high level how each system works and its role in the overall human body.

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2. Introduction
 Human body is the structure of a human being. It
comprises a head, neck, trunk, arms and hands, legs
and feet.
 Study of the human body involves-
Physiology (study of how living things function)
Anatomy (study of the structure of human or animal body)
Histology (the study of the microscopic structure of tissues)
Embryology (deals with the study of embroys & their
development)

5. Systems of Human Body
Nervous System
Respiratory System
Circulatory System
Digestive System
Excretory System
Muscular System
Skeletal System
Integumentary System
Immune System
Endocrine System
Reproductive System

6. Circulatory System
Contains the heart and
the blood Vessels.
Responsible for
movement of blood,
nutrients & Gases.
Heart pumps blood to
lungs to receive oxygen
and then to the rest of
the body.

7. Responsible for bringing
in oxygen and ridding
our bodies of carbon
dioxide.
Lungs, diaphragm &
windpipe.
Oxygenates our entire
body.

8.  Includes bones, cartilage
& teeth.
 4 Major functions:-
Protection- Protects vital
organs.
Storage- Stores minerals
& fat.
Movement- Muscles pull
bones to move.
Blood cell formation- Make
blood cells.

9.  It helps to maintain homeostasis
(balance) of the human body.
 All bodily activities, voluntary
and involuntary, are controlled
by the nervous system.
 Components-
 Central Nervous System (Include
Brain & Spinal Cord).
 Peripheral Nervous System
(Include all the Nerves)

10. Includes hairs, nails, and
skin.
Largest organ system in
our body.
Our body's first line of
defense.

11.  It consists of the gastrointestinal tract + the
accessory organs of digestion.
 Digestion involves the breakdown of food
into smaller and smaller components, until
they can be absorbed and assimilalted into
the body.
Major Organs Acessory organs
• Mouth Liver
• Esophagus (Food Pipe) Gall Bladder
• Stomach Pancreas
• Small Intestine
• Large Inestine

12. Function- to remove
waste from the human
body.
Organs-
• Kidneys
• Urethra
• Urinary Bladder
• Urethra

13. Functions-
• Body movement
• Maintenance of posture
• Heart beat
• Production of body heat
• Communication (verbal &
facial)
 Types of Muscles
• Cardiac muscle
• Skeletal muscle
• Smooth muscle

14.  It is made up of special
organs, cells and
chemicals that fight
infection (microbes).

15.  It is the collection of glands that
produce hormones that reglate
metabolism, growth and
development, tissue function,
sexual function, reproduction, sleep
& mood among other things.
 Glands: An organ which secretes
particular chemical substances for
use in body or for discharge into
theh surroundings.
 Types of Glands:
 Endocrine glands
 Exocrine glands
 Heterocrine glands

16. It is also known as genetial
system.
It is a system of sex
organs with in an organism
which work together for
the purpose of sexual
reproduction.