The Nervous System

The nervous system is the body's computer. It has a sensory input system and the motor output system. The input and output nerves are the PNS and the brain and spinal cord are the CNS. The central nervous system controls all basic bodily functions and responds to external changes. The peripheral nervous system provides a complete network of motor and sensory fibers connecting the central nervous system to the rest of the body while the autonomic nervous system parallels the spinal chord but is separately involved in control of exocrine glands, blood vessels, viscera and external genitalia. Like all organs, the components of the nervous system are made up of tissue. Nervous tissue is made up of two different types of cells, the neurons and neuroglia. The neuroglia cells are specialized cells that allow it to perform nervous system functions. In the CNS thee are four types of glial cells, the astrocytes, microglia, ependymal cells and oligodencytes. Neurons are rather bizarre-looking cells often with many branches and appears to be a tail. Each part has a specific function. An excitable cell carries a small electrical change when stimulated. A cell that is not stimulated or excited is called a resting cell and is said to be paralized. A cell that is more positive than resting is called depolarized. I've also learned that the purpose of meninges is to cover the delicate structures of the brain and spinal cord. There were also common disorders in the nervous system, the inflammation of the peripheral nerves called Guillan-Barre syndrome, meningiti,botulism, etc.


What i could possibly suggest about this topic is that, the report could have been better if the reprorter have made her own blood-waking activities and she must discussed it in her own knowledge having her own examples. However the report have been delivered well.

The Muscular System

This are all of the things that I've learned in the topic muscular system. It was really a huge topic that includes many things. The three main types of muscle are skeletal, smooth and cardiac. The skeletal muscle is striated or striped voluntary muscle that allows movement, stabilizes joints and helps maintain body temperature. Smooth muscle is a nonstriated involuntary muscle that is found in the organs of the body and linings of vessel. The cardiac muscle is also an involuntary muscle but a striated one found only in the heart. I've learned that all movement is a result of contraction of primary movers and relaxation of opposing muscles. muscles are usually attached to the bones by tendons. Large muscles are consist of many single muscle fiber comprised of myofibrils. Muscles contract as the actin and myosin protein filaments. There are also many common diseases and conditions of the muscles.

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The Skeletal System

As we continue our journey, there are many things that I've learned. With this topic, I've learned that the skeletal system is a wondrous structure that serves more functions than simply providing a framework for the human body. I've known that we can classify bone types according to their shape. Long bones are longer than they are wide and are found in our arms and legs. Short bones are fairly equal sized in width and length. Flat bones are thinner bones that can be either flat or curved. While the irregular bones are like the parts of a jigsaw puzzle. I've also learned that bones are covered with periosteum which is a tough and fibrous connective tissues. Each bone end is called epiphysis and the regon between the two ends is called the diaphysis. There is also what we call "bone tissue" which has two types, the compact and the spongy bone. I've known that ossification is the formation of bone in the body. Bones grow longitudinally in order to develop height and they grow horizontally in order to be more efficient to support the body weight. Cartilage is a special form of dense connective tissue. It also make a flexibe connection between bones. Joints are formed when two or more bones are joined together. Ligaments are whitish bands that connect from bone to bone.

There are many things that I've learned in this topic. The reporter included everything but it could have been much better if she had activities regarding the topic and had her own examples.

However, this topic includes everything about the skeletal system.