Muscular System

Once you start to exercise, your body has to make sure that the muscles that are now working much harder receive the oxygen and fuel they need to keep contracting. The various body systems must begin to work faster and harder to meet this extra demand. The muscles start to work harder, requiring more oxygen and producing more carbon dioxide, which needs to be removed

Muscle tissue has a ability to relax and contrastand so bring about movement and mechanical work in various parts of the body. There are other movements in the body too which are necessary for the survival of the organism such as the heart beat and the movements of the alimentary canal

Inspiration is due to the contraction of the diaphragm and external intercostal muscles.

the best way to think of this is using complete common sense or else you can cloud a simple concept and make it seem very difficult.

If you have a muscle fiber that if already as short as it can be, then when it contracts, the actin and myosin filaments will run out of room to contract farther and therefore you will have a very weak contraction.

If on the other hand your muscle fiber is stretched a lot before the contraction, you will have pulled the actin and myosin filaments apart, so that they no longer overlap. agin, this will produce a very weak contraction.

But, if your filaments are overlapped appropriately, then you have plenty of room for the fibers to shorten, and you get a good contraction.

The power of the contraction curve is a bell curve where you stark at zero power (at the shortest) then it peaks and drops again as the filaments are pulled too far apart.

The situation becomes more complicated when you add the effects of passive stretch, but that was not the original question, so I'll leave it at that.

The pectoralis major, teres major, lastissimus dorsi, and the carica adduct and medially, or internally, rotate the humerus.

They only have one or two nuclei

When you lift your heal towards the back of the thigh

Biceps and triceps

One of the main things that will inhibit muscle contraction is the build up of lactic acid during aerobic exercise. Lactic acid will inhibit the bodys ability to break ATP down into ADP and therefore restrict the amount of useable energy available to the muscle.

Cardiac, skeletal, and smooth muscles.
the three types of muscle in the body: cardiac (heart), skeletal (biceps, quadriceps etc.), and smooth muscle (found in the intestinal tract such as stomach and colon).

Your triceps are ment to be bigger....after all they are two thrids of the upper arm....people seem to focus on increasing the size of their biceps, this doesn't make there arms look much bigger and also can cause great damage. If I were you I would work out your triceps just as much as biceps, if not more ;)

No, the hamstring is posterior to the quadriceps.

The hamstrings are located on the back of the thigh.

The skin has 6 basic functions, including assisting the immune system, regulating the body temp., providing the body with Vitamin D, excreting small amounts of waste, retarding water loss by diffusion from deeper tissues and housing sensory receptors, besides the basic function of protecting your body from the outside world... your bones have 4 basic functions including supporting and protecting softer tissues, providing points of attachment for muscles, housing blood producing cells and storing inorganic salts... your muscles have the task of pulling your ligaments and joints so you can move your body limbs and organs, the muscles and bones work together by pulling on each other and supporting each other to move body parts.

Endomysium is the connective tissue that surrounds each muscle fibers cells. Its purpose is to hold capillary beds and contact sarcolemma.

loss of muscle mass and strength associated with senescenceAccording to wikipedia, this is the loss of muscle tissue with aging.

loss of fluid and potassium in the muscles

The hamstring (back / dorsal side of the thigh)

Hip Extension the agonist would be Glutues Maximus

The main function of the pectoralis major is to assist with the movement of the arms. It also plays a huge role in deep inhalation by pulling the ribcage out to make room for the lungs to expand.

no it is not

The nose is mostly cartilage.

However,there are muscles that are within the nose that allow some movement, such as the procerus, nasalis, dilatator naris anterior, depressor septi, and dilatator naris posterior.

During the latent period of muscle contraction Ca++ is being released from the sacroplasmic reticulum and filament movement is taking up slack. This takes approx. 2 milliseconds.

Skeletal muscle relaxants may be used for relief of spasticity in neuromuscular diseases, such as multiple sclerosis, as well as for spinal cord injury and stroke. They may also be used for pain relief in minor strain injuries.

An intercalated disc forms connections between neighboring cells in the heart. Two types of connections are formed at each intercalated disc, which connects the cell membranes of two myocytes (heart muclse cells). One is a physical connect and the other is a chemical link. These allow the heart to beat as if it is almost one cell. Other factors slow the coordination so that the heart muscle will contract top to bottom.