Your Body Has Over 600 Muscles That Make Up 40% of Your Body Weight. Without Muscles, You’d Be Just a Pile of Bones.
You have three types of muscle:
Also called striated muscles, skeletal muscles are responsible for skeletal movements. Skeletal muscles are controlled by conscious thought.
These muscles typically form the inside of blood vessels and organs, such as the stomach, bladder, and uterus. They are even found behind the eyes! Smooth muscles are automatic and not controlled consciously.
Found only in the heart, cardiac muscles are a combination of striated and smooth muscles. The muscles in the heart contract to pump blood out then relax to allow blood back in after circulating around the body.
DID YOU KNOW? Cardiac muscle never gets tired. It even goes as far as using the “waste” product of skeletal muscle, lactate, as fuel.
Connected to your skeletal system, these muscles hold your bones in position.
Tendons: attach muscle to bone
Mysia: layers of connective tissue
Myofibrils: bundles of protein filaments (myosin and actin) that are involved in the contracting of muscles
There are two types of muscle fibers:
Fast Twitch Muscle Fibers: help with sudden bursts of energy and are involved in short, intense activities, like sprinting or strength training
Slow Twitch Muscle Fibers: help with endurance or long-term activities, like bicycling
Your brain and nervous system control all muscular movements.
Skeletal muscles work with tendons to pull on bones for movement. When you want to move, your nervous system releases a neurotransmitter (acetylcholine) signaling the muscle to contract.
Your muscles can move a bone only by pulling on it. They can’t push it back into the previous position so, all muscles work in pairs of flexors and extensors. The flexor contracts to bend a limb, then relaxes, and the extensor contracts to extend or straighten the limb.
DID YOU KNOW? Skeletal muscles contribute to the body’s homeostasis by generating heat. Muscle contraction requires energy, and when ATP (source of energy at the cellular level) is broken down, heat is produced. This is easily seen during exercise or when your body gets cold—shivering produces muscle contractions to generate heat.
No matter what you are doing, your muscles are at work.
You even have muscles behind your eyeballs that help you focus! As you age you start to lose muscle mass. This loss of muscle mass can begin as early as your 30s!
There are many factors that affect muscle mass.
There are many factors that affect muscle mass, including poor diet and inactivity!
Exercising your muscles with strength and resistance exercises helps slow down the process of losing muscle mass. Supplementation with protein will provide your body with vital building blocks that will help your body grow properly, build muscle, and repair tissue!