Facts About The Human Muscular System
Have you ever sat down and wondered, ‘how do living organisms move’? The answer is simply, muscles. All humans and animals can move because of muscles. Every action that you do like, running, smiling, sitting, standing, walking, and even frowning all happens with the contraction and relaxation of muscles. If you are wanting to know more about muscles just simply read on.
There are about 650 skeletal muscles in the human body. All skeletal muscles works in pairs and are anchored to the skeletons. These muscles are considered voluntary muscles because when we think about moving a muscle signals are sent from our brain to the muscle and the muscle will contract. For example, if you want to raise your hand, you simply think of moving your arm and a message is sent from your brain to arm muscles and your arm raises.
Human smooth muscle covers internal organs such as respiratory and digestive system. These includes the lung, stomach, small and large intestine. You can notice a big difference in the structure of the muscle cells, with smooth muscles having smaller and finer structure than skeletal muscles.
Smooth muscles can be found deep inside of our body rather than closer to the skin surface. Example is like the digestive system and the respiratory system. Smooth muscles are involuntary muscles. These muscles have the capability to stretch and maintaining tension over long periods of time. We do not have any direct control over smooth muscles as they are simply controlled by the body’s nervous system. For example, you don’t want to have to eat and then continuously tell your stomach to digest, the nervous system does it for us.
Human cardiac muscles are only seen in the human heart. It plays an important role in keeping the blood, oxygen and nutrients circulating to the entire body. It is also the single most important muscle system in the whole body.
Cardiac muscles are only present in the human heart as their name suggests. These muscles have similar characteristics as both skeletal and smooth muscles. Cardiac muscles can contract but they can also stretch like smooth muscles. Cardiac muscles are ‘twitch’ muscles. This means that they only show short single contractions. Like smooth muscles, cardiac muscles are involuntary muscles. I don’t think you would want to constantly tell your heart to beat. You may want to read more about the human cardiovascular system.
More Muscle Facts
Of the 650 skeletal muscles in your body, there are 30 facial muscles that have create many different expressions. It takes more muscles to frown than to smile. The busiest muscles in your body are the eye muscles, because they move more than 100,000 times a day. The largest muscle in your body is the gluteus maximus, or more commonly known as your buttocks.