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The muscular system has three different types of muscle tissues: skeletal, cardiac, smooth. Each of these different tissues has the ability to contract, which then allows body movements and functions. There are two types of muscles in the system and they are the involuntary muscles, and the voluntary muscles. The muscle in which we are allow to control by ourselves are called the voluntary muscles. Controls are the involuntary muscles. The heart, or the cardiac muscle, is an example of involuntary muscle. The cardiac muscles are the muscle of the brain itself. . The skeletal muscle makes up about 40 % of an adults body weight. It has stripe-like markings, or striations. The skeletal muscles are composed of long muscle fibers. Each of these muscles fiber is a cell which contains several nuclei. The nervous system controls the contraction of the muscle. Many of the skeletal muscle contractions are automatic. Much of our internal organs are made up of smooth muscles. They are found in the urinary bladder, gallbladder, arteries, and veins. Also the digestive tract is made up of smooth muscle as well. The smooth muscles are controlled by the nervous system and hormones.
The nervous system is sort of like a system that tells when pain is going on, like when you get hit with a baseball and you feel the contact on instant. People that have been paralyzed from the waist down or the neck down can not feel anything that hits them or damage them in the area or penalization because there nervous system has been messed up. Nervous tissue is composed of two main cell types: neurons and glial cells. Neurons transmit nerve messages. Glial cells are in direct contact with neurons and often surround them. The nervous system is also a channel that’s delivers orders from the brain to tell other body factions what to do and what not to do. The basic controls or stuff of the nervous system is the neurons, Dendrites; axon witch has to be needed in the nervous system. The neuron is the functional unit of the nervous system. Humans have about 100 billion neurons in their brain alone! While variable in size and shape, all neurons have three parts. Dendrites receive information from another cell and transmit the message to the cell body. The cell body contains the nucleus, mitochondria and other organelles typical of eukaryotic cells. The axon conducts messages away from the cell body.
The digestive system is what processes your food in your body. It all starts out the second you take a bite of something. In your mouth, saliva has a chemical called enzyme. These chemicals break up the food. Once the food gets to your stomach it dissolves it and breaks it down into even smaller pieces. Next the food goes through the small and large intestine which absorbs all the nutrients and all the minerals contained in our food. After all this occurs our left over food (waste) in out body is deposited as poop (feces).
The respiratory system is what keeps us alive every second of our life. First Oxygen is inhaled either through our mouth or nose. Next the air is warmed, moistened, and filtered through by our noses hairs. Then the air travels though our throat or windpipes which go into one of the two lungs. In the lungs the bronchial tubes branch out and end up in an air cell called alveoli. Then the Oxygen it combined to the blood as it travels through our body.
Body Systems
