Muscle affecting

Myasthenia gravis is an autoimmune disease resulting from production of autoantibodies against AChR at the motor end plate, causing defects in neuromuscular transmission. Depending on the muscles affected a patient may develop dysphagia or respiratory failure [1]. The appearance of pathological forms of erythrocytes such as stomatocytes, echinocytes etc., in peripheral blood causes microcirculation disorders [2]. 

Skeletal muscle affected liver enzyme normal... 

There are at least two relatively common variants of TD tardive dystonia and tardive akathisia. According to Burke et al. (1982), tardive dystonia involves sustained involuntary twisting movements, generally slow, which may affect the limbs, trunk, neck, or face (p. 1335). The face and neck are by far the most frequently affected areas of the body. Severe deformities of the neck (torticollis) can cause extreme pain and disability. I have seen several cases affecting the orbital muscles of the eyes (blepharospasm) to the degree that the individual s vision was impaired, requiring botulinum (Botox) injections to paralyze the muscles. I have also seen respiratory and abdominal muscles affected in a painful and debilitating manner. 

B12. Bocek, M., Histochemistry of carbohydrates in muscle affected by poliomyelitis. Acta Histochem. 8, 43-49 (1959). 

Adenylate kinase, which is abundant in muscle as in many other tissues, decreases in dystrophic mouse and human muscle (H6, P7). This enzyme, by interconverting adenine nucleotides, probably functions in the control of glycolysis it seems reasonable to suppose, therefore, that its activity may be governed by the same factors which influence glycolytic enzymes, as discussed above. A severe decline in the activity of AMP deaminase occurs in muscular dystrophy (P6, P7) and also in denervated muscle (M12) and in some cases of muscle affected by hypokalemic periodic paralysis (E6). Skeletal muscle normally contains a higher concentration of this enzyme than other tissues in fact, it is almost absent from some, such as liver. Its physiological function, and hence the significance of the sharp decline in its activity in diseased muscle, is still a matter of speculation. 

A runner needs a tremendous amount of energy during a race. Explain how the use of ATP by contracting muscle affects the citric acid cycle. 

Vitamin E deficiency in chicks may lead to a munber of distinct diseases myopathy, encephalomalacia and exudative diathesis. In nutritional myopathy the main muscles affected are the pectorals, although the leg muscles also may be involved. Nutritional encephalomalacia, or crazy chick disease , is a condition in which the chick is imable to walk or stand and is accompanied by haemorrhages and necrosis of brain cells. Exudative diathesis is a vascular disease of chicks characterised by a generahsed oedema of the subcutaneous fatty tissues, associated with an abnormal permeabUity of the capUlary walls. Both selenium and vitamin E appear to be involved in nutritional myopathy and in exudative diathesis, but the element does not seem to be important in nutritional encephalomacia. It should be stressed that sele-niiun itself is a very toxic element and care is required in its use as a dietary additive. The toxic natine of seleniiun is discussed in Chapter 7. 

Third phase The worker complains of symptoms of peripheral neuritis, initially of hands and feet, which is essentially sensory. In more severe cases, motor paralyses occur the first muscles affected are usually the toe extensors and the peronei. In only the most severe cases will paralysis of flexor muscles of the feet or of the extensor muscles of hands occur. 

General types of physiological functions attributed to quaternary ammonium compounds are curare action, muscarinic—nicotinic action, and ganglia blocking action. The active substance of curare is a quaternary that can produce muscular paralysis without affecting the central nervous system or the heart. Muscarinic action is the stimulation of smooth-muscle tissue. Nicotinic action is primary transient stimulation and secondary persistent depression of sympathetic and parasympathetic ganglia. 

Soluble Compounds. The mechanism of barium toxicity is related to its ability to substitute for calcium in muscle contraction. Toxicity results from stimulation of smooth muscles of the gastrointestinal tract, the cardiac muscle, and the voluntary muscles, resulting in paralysis (47). Skeletal, arterial, intestinal, and bronchial muscle all seem to be affected by barium. 

Verapamil. Verapamil hydrochloride (see Table 1) is a synthetic papaverine [58-74-2] C2qH2 N04, derivative that was originally studied as a smooth muscle relaxant. It was later found to have properties of a new class of dmgs that inhibited transmembrane calcium movements. It is a (+),(—) racemic mixture. The (+)-isomer has local anesthetic properties and may exert effects on the fast sodium channel and slow phase 0 depolarization of the action potential. The (—)-isomer affects the slow calcium channel. Verapamil is an effective antiarrhythmic agent for supraventricular AV nodal reentrant arrhythmias (V1-2) and for controlling the ventricular response to atrial fibrillation (1,2,71—73). 

What has become an even greater concern in recent years is the phenomenon known as multiple chemical sensitivity disorder triggered by exposures to many chemicals in the environment. Synthetic chemicals are all around us. They are in the products we use, in the clothes we wear, in the food we eat, in the air we breathe at work. Because chemicals are everywhere in the environment, it is not possible to escape exposure. For this reason many people have become sensitized to the chemicals around them. In fact, it is estimated that 15% of the population has become sensitized to common household and commercial products. For some people the sensitization is not too serious a problem. They may have what appears to be a minor allergy to one or more chemicals. Other people are much more seriously affected. They may feel tired all the time, and suffer from mental confusion, breathing problems, sore muscles, and a weakened immune system. Such people suffer from a condition known as Multiple Chemical Sensitivity (MCS). 

Benzene is a flammable liquid and its vapors are toxic and explosive. Low concentrations are dangerous on continued inhalation because benzene affects the blood forming function of the bone marrow and it is a cancirogen. Dermatitis may result from repeated skin contact. Alkyl derivatives such as toluene and xylenes are far less toxic and are, therefore, much safer than benzene for use in solvents. Some of the symptoms of benzene poisoning are dizziness, constriction of the chest, and tightening of the leg muscles. 

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