### body part | organ | muscle:

Flexible muscle
* are almost always more resistant to injury than tight muscles
  - essential to quick reactions
  - far less likely to be strained or pulled than tight ones
* are less prone to injury
  - soreness and injury
* can decrease the risk of injury
  - travel further when they contract, which translates to additional strength

Healthy muscle
* are free of spasm, weakness, pain, knots, or degeneration.
* make for a healthy person.
* provide protection to bones and joints.

### body part | organ | muscle:

Heart muscle
* Most heart muscles are part of hearts.
* are controlled by the sinus node influenced by the autonomic nervous system
* can even die if blood flow stops.
* is both consumer and provider of energy.
* respires anaerobically for just a short time, under conditions of ischemia.
* shows fibrosis of the conducting system, myocyte hypertrophy and fatty infiltration.
+ Heart disease, Types of heart disease
  * This is a problem with the blood vessels that deliver blood to the heart muscle. If these blood vessels get very small, or if they become blocked, blood cannot flow through them normally. Since less blood is supplied to the heart muscle the muscle cannot work at normal capacity. The heart muscle can become sick and weak. Heart muscle can even die if blood flow stops. Blocked arteries in the heart are often caused by smoking, high cholesterol, high blood pressure, diabetes and inherited traits from parents. All of these problems damage the lining of the heart's blood vessels and make them become narrowed or blocked completely.
+ Myocardium: Heart :: Anatomy of the cardiovascular system

### body part | organ | muscle | heart muscle:

Papillary muscle
* are small conical projections that protrude from the ventricle walls.
* help hold the valves in place.

Large muscle
* attach on large bones.
* lies medial to the rectus femoris.
* radiate from it to the chest wall, spinal column, and skull.

Lean muscle
* has a greater density than fat so it weighs more and takes up less space
  - much more water than fat tissue and allows the signal to pass easily
* is much heavier than fat.

Long muscle
* have more sarcomeres linked end to end.
* lie just underneath the epidermis.

Longitudinal muscle
* are present and provide for whip-like movements.
* compress the thoracic box and cause the wings to move down.
* constract and the shell is pulled forward.
* run the length of the body and can shorten or lengthen the worm.

Loss of muscle
* Any loss of muscle is detrimental to the dieter because muscle burns calories.
* is an important cause of frailty.

Muscle atrophy
* means the muscle is shrinking and the mass of the muscle became smaller.
* plagues both astronauts in space and the elderly.
* refers to the shrinkage of muscle fiber from lack of forceful exertion.

Muscle relaxation
* is caused by the uptake of calcium back into the sarcoplasmic reticulum.
* requires energy-dependent pumping of calcium back into storage sites.

Muscle testing
* form of kineseology that can be life saving.
* is used help diagnose what is functioning abnormally
  - to establish exactly what the energy system needs
* method which reveals the body's intuitive knowingness.

Normal muscle
* shows no electrical activity at rest.
* use two sources of fat.

Pelvic muscle
* can weaken because of pregnancy, childbirth, and prior pelvic surgery.
* help stop the flow of urine.

Pronator
* are muscles.
* teres muscle
  - muscles arise from medial supracondylar ridges

Quad
* Some quads are part of legs
  - thighs
* are also dipoles
  - areas
  - basically motorcycles with four wheels
  - types
* includes cell membranes
  - corpi
  - cytoplasm
  - lobes
  - myofibril
  - nuclei
  - plasma membranes
  - sections
  - vacuoles

Red muscle
* are used for sustained activity, such as ocean migrations.
* is useful for endurance activities like long-distance running.