The Muscular System!
Breaking news on the Muscular System!
Muscle is a soft tissue in the body of humans and animals. Its main purpose is to produce force and motion.
Muscles are responsible for maintaining posture, physical movement (sitting, walking, eating, etc), and movement of internal organs (such as keeping the heart pumping to circulate blood and moving food through the digestive system).
The word muscle is derived from the Latin term musculus, meaning "little mouse". This Latin term could be due to the shape of some muscles or because muscles contracting under the skin can look like a mouse moving under a rug.
Tendons and More!
Tendons connect our soft contracting muscle to our hard bones.
There are around 650 skeletal muscles in the human body.
There are three types of muscle, skeletal, cardiac, and smooth.
Skeletal muscles (or striated) are voluntary muscles that control nearly every action a person intentionally performs. Tendons attach the muscle to two bones across a joint, as one muscle contracts the other relaxes which moves the bones.
3 most commonly broken bones
Most common with adults
Most commonly broken by children
A broken ankle happens when you roll or twist you ankle in a matter that is unnatural
Skeletal muscle can be further divided into two types, slow twitch and fast twitch.
Slow twitch (Type I) muscle contain proteins that give it a rich red color. This muscle carries more oxygen efficiently and using fats, proteins or carbs as energy slow twitch muscle fibers contract over a long period of time.
Therefore type I muscle fiber works well for aerobic sports such as long distance running and cycling.
Fast twitch (Type II) muscle is whiter in color as it has less myoglobin (a oxygen carrying protein). Fast twitch fibers contract quickly and powerfully, however they fatigue rapidly.
Therefore type II muscle fiber is useful for anaerobic exercise such as sprinting or for strength sports like weightlifting.