THE HUMAN BODY – HOW OUR BODY SYSTEM WORKS – THE HUMAN BODY IS A COMPLEX MACHINE, MADE UP OF SEVERAL IMPORTANT ORGANS. THESE ORGANS ARE A PART OF DIFFERENT SYSTEMS IN THE BODY. WITHOUT THESE INTERNAL ORGANS AND SYSTEMS, OUR BODY WOULD BE UNABLE TO FUNCTION NORMALLY.
The skeletal system provides shape and from to our bodies. It supports, protects and allows easy body movement. Vital organs are protected by the bony skeleton; the brain is protected by the skull; the heart and lungs are protected by the rib cage.
Muscles are bundles of cells and fibers. They act as elastics that allow the bones to move and hence make movement possible. Muscles are connected to bones by tendons and bones are connected to each other by ligaments. Bones meet each other at joints. Muscles cause movement of a joint by contracting and relaxing. Some muscles in the body move on their own that is involuntarily. For example, the muscles of the diaphragm and heart.
The heart is the most important organ in the human body. It is composed of muscles that pump blood throughout the body. It beats about seventy-two times every minute in an adult body. The heart pumps blood to the lungs where the carbon dioxide in the blood is eliminated and fresh oxygen is added to the blood. This oxygen-rich blood is then pumped to all parts of the body.
Central Nervous System
The brain and spinal cord make up the central nervous system. The brain lies in the skull while the spinal cord is protected by the vertebrae. The human brain is the most developed as compared to any other animal. It is the control center for movement, sleep, hunger, thirst and all other activities important for survival.
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The human brain is divided into two parts. The left side of the brain controls the right side of the body, while the right side of the brain controls the left side of the body.
The lungs are a pair of sac-like respiratory organs that help us to breathe. With each breath, the lungs add fresh oxygen to the blood, which is then carried to all the cells in the body; impure air is exhaled through the nostrils.
Food enters the stomach through the esophagus from the mouth. The stomach is the organ of digestion. It changes its size and shape according to the amount of food inside it. In the stomach, the gastric juices break down the food and it is passed on the small intestine.
The liver is reddish-brown color and lies on the right side of the abdominal cavity. It helps to break down fats, filters harmful substances from the blood, stores vitamins, and minerals and maintains proper glucose level in the blood.
The intestine is divided into two sections- the small intestine and the large intestine. The small intestine is about 6 meters long. It is coiled up in the center of the abdominal cavity. Most of the food is absorbed in the small intestine. The large intestine is wider than the small intestine but is only 1.5 meters long. It absorbs water and is responsible for the excretion of solid waste material.
The kidneys are two small bean-shaped organs located at the back of the stomach. Their main function is to separate the toxins and other waste material from the blood and flush them out.
|THINGS TO REMEMBER:-|
. The human body is made up of several organs that are arranged from various systems.
. The skeletal system gives shape and support to our body.
. The muscular system helps us to move.
. The digestive system breaks down the food into simple from.
. The circulatory system supplies blood to all parts of the body.
. The respiratory system helps to inhale oxygen and exhale impure air.
. The excretory system removes waste from the body.