### body part | organ | muscle:

Small muscle
* are in hands and fingers.
* lie deep to the erector spinae muscle group.

### body part | organ | muscle:

Smooth muscle
* Some smooth muscles surround airways
  - arteries
* acts as sphincters at alveolar openings.
* are important in contraction of internal organs
  - in many places
  - involuntary muscles
  - involved in many 'housekeeping' functions of the body
  - present in the iris, as well as in the ciliary apparatus
  - usually long and spindle-shaped, and each cell has a nucleus
* associated with internal organs are under autonomic control.
* can comprise the sarcomatous component of gliosarcomas.
* carries out adjustments to an organism's internal environment.
* contain only one nucleus while skeletal muscles are multinucleated.
* contains extensive amounts of intermediate filaments, primarily of the desmin type
  - many different receptors which mediate contraction or relaxation
* develops in the ureteric wall.
* is affected by both nervous and hormonal input
  - called such because it has no striations
  - capable of active regeneration after injury
  - composed of cells each of which is provided with a nucleus
  - found in internal organs, while cardiac muscle is present only in the heart
* is found in the walls of arteries and organs of the body
  - the internal organs
* is involuntary, being under the control of the autonomic nervous system
  - thecontrol of the autonomic nervous system
  - quite com- mon in the lower animals
  - rather different from striated muscle contraction
  - responsible for the movement of the skeleton
  - shown here in discrete bands beneath the epithelium
  - smooth in appearance
  - stimulated by the autonomic nervous system
  - stronger than skeletal muscle
  - the muscle that lines portions of the digestive system
  - usually from hypomere mesoderm and forms the visceral or involuntary muscles
  - very important in the respiratory system
* lacks sarcomeres hence there are no striations.
* maintains force without using much energy in a state called latch.
* makes up the walls of internal organs, such as blood vessels and the digestive tract.
* provide the contractile forces for most of our internal organs.
+ Muscle, Types of muscles: Tissues
  * The Smooth muscles are the other muscles in the body that are involuntary. Smooth muscles are in many places.

Spastic muscle
* aggravate exhaustion.
* can be present.

Special muscle
* squirt the sperm into the vagina.
* stretch and relax the lens to change focus.

### body part | organ | muscle:

Sphincter
* Many sphincters are used every day in the normal course of digestion.
* Most sphincters control anuses.
* are found in many animals
  - little muscles that open and close to let liquids and solids through
* control the aperture sizes of the oscula
  - passage of liquids and solids
* includes cell membranes
  - corpi
  - cytoplasm
  - lobes
* includes muscle cells
  - fiber
  - fibre
  - nuclei
  - plasma membranes
  - sections
  - vacuoles
* play an important role in keeping the body sound and healthy.

Sphincter muscle
* become overactive, causing leaks or emptying.
* keep the bladder closed until it is time to urinate.

Stretched muscle
* require less energy for completion of movements.
* tends to immediately contract with greater force.

### body part | organ | muscle | striated muscle:

Abdominal muscle
* are relaxed after birth, so the abdomen is soft and still rounded
  - skeletal muscles
  - the intersection of the upper and lower body
* exercises to strengthen stomach muscles.
* tend to push urine out of the bladder instead of holding it in.

### body part | organ | muscle | striated muscle | abdominal:

Strong abdominal
* are essential to maximizing performance in almost all sports
  - important to power lifters
* improve posture and help prevent low back pain.