Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
The Human Body The human body is made up of millions of tiny cells. Cell– The basic unit of life. Tissues - A group of cells of the same kind of cells that carry on the same activity or work. There are five main kinds of tissue in the human body. 1. Muscle Tissue includes all the muscles in the body. 2. Nerve Tissue makes up the nerves and the brain. 3. Epithelial Tissue includes the outer skin and the linings of such parts as the mouth, nose, throat, heart, stomach, liver, and intestines. 4. Connective Tissue helps hold the body parts together and includes such materials as tendons, ligaments, cartilage, and bone. 5. Blood, although a liquid, is also a tissue. Organ - A group of different tissues, all working together. Examples of organs include the heart, lungs, liver, stomach, eyes, and brain. System - A group of organs working together on a special body activity. We will discuss/learn some of the systems of the body. 1. The skin system covers the body, and includes the skin, hair, and nails. 2. The skeletal system supports the body, and includes the bones. 3. The muscular system makes it possible for the body and its parts to move. 4. The digestive system digests the food we eat, and includes such organs as the mouth, stomach, intestines, and liver. 5. The circulatory system, or blood system, includes the heart, arteries, veins, and tiny blood vessels called the capillaries. 6. The respiratory system, or breathing system, includes such organs as the nose, bronchial tubes, windpipe, and lungs. 7. The excretory system gets rid of the waste products formed in the body, and includes such organs as the kidneys and bladder. 8. The nervous system makes it possible for the body to respond to things around the body, and includes such organs as the nerves, brain, and the spinal cord. 9. The endocrine system, or gland system, gives off special chemicals that control and regulate the action of the body. Life processes -- Cells carry out all the activities that living things do in order to live. These activities are called life processes. Some important life processes are respiration, circulation, digestion, assimilation (absorbing nutrients into the body), excretion, growth, and motion.