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The skeleton is made of bones, joints between bones, and cartilage. ... There are 206 bones in the human skeleton. They have various shapes-long, short, cube ...

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Anuraga lakshmi


Jabasheela. J




Human Body

In human body there are different organ each organ play an important role in life process.


Parts of human body

Human body is divided into two

parts :

1.Interior organs

2.Exterior organs


Internal Organ

This type of organ is not visible to our eyes. Organs such as heart, lungs, kidney etc are not visible. They are inside our body


Exterior Organ

These types of organs are visible and are externally located. Eg Eye, Mouth, Skin etc


Internal organ

1)Respiratory system 7)Human Heart

2)Digestive system 8)Brain

3)Circulatory system 9) Muscles

4)Excretory system 10)Joints

5)Skeletal system

6)Nervous system


Respiratory system

  • Respiratory System, in anatomy and physiology, organs that deliver oxygen to the circulatory system for transport to all body cells.
  • In addition to supplying oxygen, the respiratory system aids in removing carbon dioxide, preventing the lethal buildup of this waste product in body tissues.

Digestive system

  • Digestive System, series of connected organs whose purpose is to break down, or digest, the food we eat. Food is made up of large, complex molecules, which the digestive system breaks down into smaller, simple molecules that can be absorbed into the bloodstream. The simple molecules travel through the bloodstream to all of the body's cells, which use them for growth, repair, and energy.

Circulatory system

  • Circulatory System, or cardiovascular system, in humans, the combined function of the heart, blood, and blood vessels to transport oxygen and nutrients to organs and tissues throughout the body and carry away waste products.
    • .

Excretory system

This type of system helps in removing wastes from the body.


Skeleton system

The skeleton is made of bones, joints between bones, and cartilage. Its function is to provide support and protection for the soft tissues and the organs of the body and to provide points of attachment for the muscles that move the body. There are 206 bones in the human skeleton. They have various shapes-long, short, cube-shaped, flat, and irregular.


Nervous system

Sensory nerves carry information from the sense organs and other body receptors to the central nervous system--the brain and spinal cord--for processing. Then motor nerves carry the processed information from the central nervous system to the glands and muscles for appropriate action


Human Heart

  • A muscular, pear-shaped organ slightly larger than a clenched fist, the human heart is the center of the circulatory system. The human heart pumps blood through the body at a rate of more than about 4 quarts (3.8 liters) per minute.


  • The human brain is a miraculous organ. It regulates thought, memory, judgment, personal identity, and other aspects of what is commonly called mind. It also regulates aspects of the body--including body temperature, blood pressure, and the activity of internal organs--to help the body respond to its environment and to maintain the body's health. In fact, the brain is considered so central to human well-being and survival that the death of the brain is considered in many parts of the world to be equal legally to the death of the person.


All animal movement depends on the use of muscles. Whether the movement is as simple as opening the eyes or as complex as running the high hurdles at a track event, each is the result of a complex series of electrical, chemical, and physical interactions involving the brain, the central nervous system, and the muscles themselves.



The skeletons of animals would be too stiff to move or would fall in a disorderly heap if they were not carefully fitted with joints. A joint is a connection that holds together two or more bones or other hard structures. Joints have two main purposes: They give support, and they allow movement where it is needed.

All animals that have segments have joints.



You have seen the various structures & function of interior organs

Let us see the functions of Exterior organs

  • Human is the only well fully developed organism among all living creatures.

Exterior organs









The human eye is a complex part of the body that is used for seeing. Eyes enable people to perform daily tasks and to learn about the world that surrounds them. Sight, or vision, is a rapidly occurring process that involves continuous interaction between the eye, the nervous system, and the brain. When someone looks at an object, what he really sees is the light reflected from the object. This reflected light passes through the lens and falls on the retina of the eye


Retina. The retina is a soft, transparent layer of nervous tissue made up of millions of light receptors. The retina is connected to the brain by the optic nerve. All of the structures needed to focus light onto the retina and to nourish it are housed in the eye, which is primarily a supporting shell for the retina.



Nose It was in part the development of internal nostrils in ancient fishes that paved the way for our evolutionary ancestors' migration from sea to land millions of years ago. Nostrils provide a means of air intake for lung-breathing animals and have developed into structures that exist today



The nose has two cavities and is symmetrical around the nasal septum, the wall of cartilage that separates the cavities and extends from the nostril openings, or nares, to the nasal part of the pharynx, or nasopharynx. At the tip the nose is flexible cartilage; close to the skull it is lined with bone. Cartilage on each side of the nose bone gives the nose its shape.

In general, the lower part of the nasal cavity is called the respiratory area and the upper, the olfactory region. As part of its respiratory function the nose filters, warms, and moistens incoming air on its way to the lungs. From the olfactory areas the olfactory nerve endings lead to the undersurface of the brain. Inhaled air passes up and across these nerve endings, but exhaled air passes through the respiratory area only. Thus a person can smell incoming air but cannot detect an odor in his own exhaled breath.



MOUTH. Invertebrate animals, including humans, the mouth is the entrance to the long and uninterrupted tube called the digestive tract (see Digestive System). It is composed, on the outside, of lips and cheeks; on the inside are the mouth's roof, floor, tongue, teeth, and gums. (See also Teeth and Gums; Tongue.) In humans the mouth has two primary functions. It is used for eating and beginning the process of digestion as well as for speaking.



  • EAR. Vibrations of air molecules moving through the air are received and translated into messages that the brain recognizes as sound by a complex organ--the ear. The ear has two important, but different, functions: hearing and sensing the body's equilibrium, or balance. The mechanisms for these processes are located within a hollow space in the skull's temporal bone


HAND. Human beings, alone in the animal kingdom, are tool makers and tool users. The ability to make and use tools depends to a great extent upon the use of the hands guided by the intelligence of the brain. It is believed that in the evolution of humanity the development of the brain and dexterity in the hands were mutually dependent processes.

All vertebrates have hands or something like them. In some animals they are called paws; in the case of birds and some reptiles they are claws. Horses and cattle have hooves. The hand may be defined as the grasping end of the forelimb.



Leg (anatomy), in anatomy, one of the paired limbs of a vertebrate, used chiefly for supporting the body and for locomotion. The upper part of the human leg, the thigh, is supported by the femur—the longest and strongest bone of the body. The upper end of the femur is rounded and fits into a cavity in the hip bone, forming a ball-and-socket joint. Ball-and-socket joints permit circular motion, and the hip joint allows the leg to move freely in almost any direction. This joint also helps distribute body weight evenly over the head of the femur. At the knee, the femur connects to the tibia, or shinbone, to form a hinge joint. Hinge joints permit back-and-forth movement similar to the motion of a hinged door.



In man teeth are embedded in the jaw bones.

Structure of typical tooth:Tooth is made up of a very hard material called dentine. Three main parts of tooth are crown, neck, root. In the centre , there is pulp cavity containing blood vessels and nerves. The part of the tooth projected above the gum is covered with enamel, which is harder than dentine.





Thank you