Internal Organs of Human Body:
The human body is composed of many parts, each of which serves a special function. The human body is like a well-organized machine capable of performing different tasks.
Structure Of Human Body:
The ability of the body to do all the things it can do is due to the special structures both inside and outside that work together in an orderly manner. Organs are two or more types of tissue that work together to perform a specific task.
The brain is one of the most complex and magnificent organs in the human body. Our brain gives us awareness of ourselves and of our environment, processing a constant stream of sensory data. It controls our muscle movements, the secretions of our glands, and even our breathing and internal temperature.
The heart the central organ of the cardiovascular system, is located between the two lungs in the middle of the chest. Two-thirds of the heart lies to the left of the breastbone and one third to the right. The adult heart is about the size of two clenched fists. It is shaped like a cone and weighs about 7 to 15 ounces, depending on the size and weight of the individual. The heart circulates blood through two pathways: the pulmonary circuit and the systemic circuit.
The Human Lungs:
The human lungs are a pair of large, spongy organs optimized for gas exchange between our blood and the air. The lungs are divided into different parts which are called lobes. The right lung has three lobes called upper, middle and lower lobes. The left lung only has two lobes, the upper and lower.
The skeleton is the framework of the body, it supports the softer tissues and provides points of attachment for most skeletal muscles. The skeleton provides mechanical protection for many of the body’s internal organs, reducing risk of injury to them.
There are 206 named bones in the human skeleton, and they can be divided between two major regions of the skeleton: the axial skeleton consists of the skull, vertebral column, and rib cage; the appendicular skeleton consists of the arms, pectoral girdles, legs, and pelvic girdle.
The liver is the body’s second largest organ; only the skin is larger and heavier. The liver performs many essential functions related to digestion, metabolism, immunity, and the storage of nutrients within the body. These functions make the liver a vital organ without which the tissues of the body would quickly die from lack of energy and nutrients.
The stomach is a muscular organ located on the left side of the upper abdomen. The stomach receives food from the esophagus. As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter. The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion.
The Small Intestine:
The small intestine (small bowel) is about 20 feet long and about an inch in diameter. Its job is to absorb most of the nutrients from what we eat and drink. Velvety tissue lines the small intestine, which is divided into the duodenum, jejunum, and ileum.
The Large Intestine:
The large intestine (colon or large bowel) is about 5 feet long and about 3 inches in diameter. The colon absorbs water from wastes, creating stool. As stool enters the rectum, nerves there create the urge to defecate.
The kidneys are important organs with many functions in the body, including producing hormones, absorbing minerals, and filtering blood and producing urine. The kidneys’ function are to filter the blood. All the blood in our bodies passes through the kidneys several times a day. The kidneys remove wastes, control the body’s fluid balance, and regulate the balance of electrolytes.
Useful for CBSE, ICSE, NCERT & International Students
Grade : 4
Subject : Evs
Lesson :Our Body
Topic: INTERNAL ORGANS OF HUMAN BODY
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