What are three facts about muscles?

Answer 1

There are 600 muscles in your body which do everything from pumping blood throughout your body to helping you lift your heavy backpack.

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 fibres make up each muscle.

You have three different types of muscles in your body: smooth muscle, cardiac muscle, and skeletal muscle.

You control some of your muscles, while others --- like your heart --- do their jobs without you thinking about them at all.

Smooth muscles --- sometimes also called involuntary muscles --- are usually in sheets, or layers, with one layer of muscle behind the other. You can't control this type of muscle. Your brain and body tell these muscles what to do without you even thinking about it. You can't use your smooth muscles to make a muscle in your arm or jump into the air.

Smooth muscles are at work all over your body.

In your stomach and digestive system, smooth muscles tighten up and relax to allow food to make its journey through the body.

Your smooth muscles help if you're sick and you need to throw up the muscles push the food back out of the stomach so it comes up through the esophagus and out of the mouth.

Smooth muscles are also found in your bladder.

When they're relaxed, they allow you to hold in urine until you can get to the bathroom. Then they contract so that you can push the urine out. These muscles are also in a woman's uterus, which is where a baby develops. There they help to push the baby out of the mother's body when it's time to be born.

Smooth muscles work behind your eyes; these muscles keep the eyes focused.Just like smooth muscle, cardiac muscle works all by itself with no help from you.

The muscle that makes up the heart is called cardiac muscle. It is also known as the myocardium The thick muscles of the heart contract to pump blood out and then relax to let blood back in after it has circulated through the body.

Skeletal muscles are voluntary muscles, which mean 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 the musculoskeletalsystem --- the combination of your muscles and your skeleton, or bones.

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.

Some of your biggest and most powerful muscles are in your back, near your spine. These muscles help keep you upright and standing tall.

The tendons are tough bands of connective tissue that attach muscles to bones.

The quadriceps are the part of muscle that straightens the knee.

Muscle is the contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells.

Muscle cells contain contractile filaments that move past each other and change the size of the cell.

The function of muscles is to produce force and cause motion.

Muscles can cause either locomotion of the organism itself or movement of internal organs.

Cardiac and smooth muscle contraction occurs without conscious thought and is necessary for survival.

Voluntary contraction of the skeletal muscles is used to move the body and can be finely controlled.

There are two broad types of voluntary muscle fibers: slow twitch and fast twitch. Slow twitch fibers contract for long periods of time but with little force while fast twitch fibers contract quickly and powerfully but fatigue very rapidly.

Various exercises require a predominance of certain muscle fiber utilization over another.

Your quadriceps, or quads, are the muscles on the front of your thighs. Many people who run, bike, or play sports develop large, strong quads
Your heart is as big as your fist.

Answer 2

They are made of muscle cells called myofibers. Each myofiber is covered in fascia. Muscles use calcium to trigger contractions. They use ATP for energy. They have contractile units called sarcomeres.

Answer 3

They behave like tiny batteries, with voltages (known as membrane potentials) in the millivolt range. This property enables the cells to generate tiny electrical currents, making it possible for the muscle cells to "twitch", i.e., contract and to pump blood (heart muscle). Normally, heart muscle cells in the adult no longer divide. They can only increase in size.

Answer 4

1. You use 17 muscles in order to smile, and 43 to frown

2. Biggest muscle in the human body is the buttock muscle

3. Your muscles are normally around 40-50% of your body weight