Muscular System

The Pectoralis major (clavicular head), coracobrachialis, and biceps brachia are the synergists for shoulder flexion.

For horizontal flexion, the Anterior deltoid is the synergist muscle.

The Biceps brachii muscle. We just call it the biceps, though. (Pronounced bye-seps)

To straighten the arm again, the triceps muscle is contracted - which lies 'underneath' the upper arm.

The muscle that separates the right and left side of the heart is called the interventricular septum and is just a continuation of the cardiac (Heart) muscle of the heart's walls.

ascending branch of lateral circumflex femoral artery

Yes they do, fat cells have very little function and therefore require much less energy than muscle cells.

The iris dilates in dimmer light to allow more light into the eye through the pupil then lens, through the inner eye onto the retina, and finally to the optical nerve. The iris will contract when lots of light is exposed to the eye to allow less light into the eye, so we are not blinded.

Sources:

My science teacher in 5th grade. :)

Fascia, a connective tissue that is very strong and wraps all the muscle cells.

Tear would occur in the muscle, and fluid would often build up and cause the muscle to swell. The best thing to do for treatment is to either get some ice and elevate the posture of your pulled muscle, keep the ice on it up to 24 hours or just elevate it and rest it at, home it will soon go away. It usually lasts up to 2-3 weeks. Movement is restricted because of the pain, so don't try to move it or it will probably strain a lot more if if you take a wrong move.

Muscle Tissue

the lungs and the legs contract the heart for regular pulse that murmurs

The epimysium.

The heart; also known as the only organ that uses cardiac muscle in the whole body.

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It is called peristalsis

Most muscles have a countering muscle that works in the opposite direction.

E.g the biceps and the triceps. So one relaxes when the other tightens and vice versa.

That's as far as I know.

The two main types of muscles are voluntary muscles and involuntary muscles. An voluntary muscle is a muscle that you use and work at your own will power such as your biceps or quads. In involuntary muscle is a muscle that is always being uses and you can not direct it otherwise, such as the heart.

I think it's the Large Intestine & Small Intestine: you just got your answer from Jessica Rust

Look it up in an encyclopedia. There are two sphincter muscles, one controls food going into the stomach from the esophagus (throat) and one that controls the chime, or the food after being treated by stomach acid and enzymes in the stomach, as it enters the intestines. Food is not digested in the stomach. It is prepared there and sent through the intestines, where the various components are absorbed or further treated and absorbed. It is quite complex.

The antagonist to the Triceps are the biceps-brachii

While taking a step, you move your thigh and your hip backward. The gluteus muscles in your butt and key muscles like semitendinosus, biceps femoris and semimembranosus found in the hamstrings at the back of the thigh are involved. A small muscle at the top of the inner thigh called adductor magnus is also involved.

Increased pliability of muscles: muscle spindles are located within muscle fibres. When muscle spindles are stretched the nerve impulses are made and information relative to the degree of stretch is sent to the nervous system. It then sends the messages back concerning how many motor units should be contracted in order to have a smooth movement. When your body is used to steady state exercise the more efficient your muscles spindles become at transmitting information, and the more pliable muscles become

Myofibrils

The sarcomere is the unit of muscular contraction.

Mutually agreed upon.

Sit ups train the abdominals when performed properly. They also train the back muscles too. There are many different variations to work different muscle groups.