3.4.2. Muscular system

Did you know you have more than 600 muscles in your body? They do everything from pumping blood throughout your body to helping you lift your heavy backpack. You control some of your muscles, while others — like your heart — do their jobs without you thinking about them at all.

Body Basics: Muscles and Joints

Muscles are all made of the same material, a type of elastic tissue (sort of like the material in a rubber band). Thousands, or even tens of thousands, of small fibers make up each muscle.

You have three different types of muscles in your body: smooth muscle, cardiac (say: KAR-dee-ak) muscle, and skeletal (say: SKEL-uh-tul) muscle.

Skeletal Muscle

Now, let’s talk about the kind of muscle you think of when we say “muscle” — the ones that show how strong you are and let you boot a soccer ball into the goal. These are your skeletal muscles — sometimes calledstriated (say: STRY-ay-tud)muscle because the light and dark parts of the muscle fibers make them look striped (striated is a fancy word meaning striped).

Skeletal muscles are voluntary muscles, which means you can control what they do. Your leg won’t bend to kick the soccer ball unless you want it to. These muscles help to make up themusculoskeletal (say: mus-kyuh-low-SKEL-uh-tul) system — the combination of your muscles and your skeleton, or bones.

Together, the skeletal muscles work with your bones to give your body power and strength. In most cases, a skeletal muscle is attached to one end of a bone. It stretches all the way across a joint (the place where two bones meet) and then attaches again to another bone.

Skeletal muscles are held to the bones with the help of tendons(say: TEN-dunz). Tendons are cords made of tough tissue, and they work as special connector pieces between bone and muscle. The tendons are attached so well that when you contract one of your muscles, the tendon and bone move along with it.

Skeletal muscles come in many different sizes and shapes to allow them to do many types of jobs. Some of your biggest and most powerful muscles are in your back, near your spine. These muscles help keep you upright and standing tall.

They also give your body the power it needs to lift and push things. Muscles in your neck and the top part of your back aren’t as large, but they are capable of some pretty amazing things: Try rotating your head around, back and forth, and up and down to feel the power of the muscles in your neck. These muscles also hold your head high.

labeled_muscles_of_the_faceFace Muscles

You may not think of it as a muscular body part, but your face has plenty of muscles. You can check them out next time you look in the mirror. Facial muscles don’t all attach directly to bone like they do in the rest of the body. Instead, many of them attach under the skin. This allows you to contract your facial muscles just a tiny bit and make dozens of different kinds of faces. Even the smallest movement can turn a smile into a frown. You can raise your eyebrow to look surprised or wiggle your nose.

And while you’re looking at your face, don’t pass over your tongue — a muscle that’s attached only at one end! Your tongue is actually made of a group of muscles that work together to allow you to talk and help you chew food. Stick out your tongue and wiggle it around to see those muscles at work.

Major Muscles

Muscular System 2Because there are so many skeletal muscles in your body, we can’t list them all here. But here are a few of the major ones:

  • In each of your shoulders is a deltoid (say: DEL-toyd) muscle. Your deltoid muscles help you move your shoulders every which way — from swinging a softball bat to shrugging your shoulders when you’re not sure of an answer.
  • The pectoralis (say: pek-tuh-RAH-lus) muscles are found on each side of your upper chest. These are usually calledpectorals (say: PEK-tuh-rulz), or pecs, for short. When many boys hit puberty, their pectoral muscles become larger. Many athletes and bodybuilders have large pecs, too.
  • Below these pectorals, down under your ribcage, are yourrectus abdominus (say: REK-tus ab-DAHM-uh-nus) muscles, orabdominals (say: ab-DAHM-uh-nulz). They’re often called abs for short.
  • When you make a muscle in your arm, you tense your biceps(say: BYE-seps) muscle. When you contract your biceps muscle, you can actually see it push up under your skin.
  • Your quadriceps (say: KWAD-ruh-seps), or quads, are the muscles on the front of your thighs. Many people who run, bike, or play sports develop large, strong quads.
  • And when it’s time for you to take a seat? You’ll be sitting on your gluteus maximus (say: GLOOT-ee-us MAK-suh-mus), the muscle that’s under the skin and fat in your behind!
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