Power contracted

Muscles contain enough creatine phosphate to power contraction for about ten seconds. 

The atria (sing, atrium) are chambers that receive blood returning to the heart through the veins. The blood then moves to the ventricles, or delivery chambers, of the heart. The powerful contractions of the ventricles generate a force... 

Failure of mitochondria to generate sufficient ATP to power contraction of the muscles leads to fatigue, which... 

Oxytocin (OT) is a nonapeptide in which six amino acids form a ring closed by a disulfide bridge, while the ring itself forms an antiparallel pleated sheet. The tail portion of the peptide, composed of Pro-Leu-Gly-NHj, is also rigidly held in a folded conformation. Oxytocin causes the powerful contraction of some smooth muscles and plays a vital role in milk ejection (not to be confused with milk secretion, which is regulated by prolactin). It also has uterotonic action, contracting the muscles of the uterus, and is therefore used clinically to induce childbirth. 

As the plant worked out operational problems, the power generated had to be consistent, because the long-term power contract requires dependable power for sale. Therefore, when tire-feed was a problem, the company had to keep the boilers operating using natural gas, at considerable company expense. 

Skeletal Long syncytial, multinucleated Rapid, powerful contractions Movement of the bony parts... 

Muscle cells contain many mitochondria which are often present as reticulum-like structures extending longitudinally in the fiber near the sarcolemma, rather than as discrete ellipsoidal organelles found in many other cells. These provide much of the high-energy phosphate needed to power contraction and to operate the Ca + pumps that control the cytosolic calcium concentration. Different types of skeletal muscle fibers differ considerably in the extent and organization of both their SR and mitochondria. 

Glycolysis in skeletal muscle provides ATP primarily to power contraction. Gonsequently, the primary control of muscle glycolysis is the energy charge of the cell—the ratio of ATP to AMP. Let us examine how each of the key regulatory enzymes responds to changes in the amounts of ATP and AMP present in the cell. 

Cytisine is almost indistinguishable from nicotine in its pharmacological actions. On the uterus, little effect is noted on isolated preparations, but in vivo, cytisine induces strong contractions (118, 119). According to Dale and Laidlaw, the effect produced by cytisine in the cat depends on the sexual state of the animal. The uterus of the virgin animal is inhibited, whereas that of the pregnant cat is stimulated. Powerful contractions have been observed after the intravenous injection of 1.0 mg. in the gravid animal. 

The mixed sulfates of the alkaloids of Alstonia constricta F. Mnoll resemble the cinchona alkaloids in many of their pharmacological actions. Oxytocic activity has been reported by both Sharp (171) and Keogh and Shaw (172). On the isolated uterus of the rat and guinea pig, both a stimulant and depressant action was observed, but the effect was always similar to that of quinine on any one particular preparation. Powerful contraction of the cat uterus in situ was produced by doses of 20.0 mg. administered intravenously. 

Power Factor. Most public utilities have a clause in their power contracts requiring a plant with low power-factor loads to pay a penalty charge or an increased rate the power factor of a motor represents the percentage of the load or power current to the total line current. The line current is made up of magnetizing or reactive current and power or active current. This reactive current represents just as real a burden to the power system as the active or load current, even though it does... 

EXAMPLE 13.21 Type II muscle fibers are subdivided into type Ila and type Ilb. Type Ila can use both aerobic and anaerobic metabolism to produce ATP whereas type lib fibers use only anaerobic metabolism. In contrast to type I muscle fibers, type lib fibers contract rapidly after stimulation by a nerve impulse. They have evolved for short-lived, powerful contractions by the possession of characteristically active myosin ATPases and a dense packing of contractile filaments. So much of the cytoplasmic space is taken up with filaments that little exists for mitochondria. Similarly, these fibers are associated with a relatively poor blood supply. Type lib fibers are also known as white and fast-twitch muscle fibers and are adapted for short-lived but powerful contractions. The relative paucity of mitochondria and the poor blood supply impose obvious constraints on the generation of ATP during exercise. 

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