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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.