... neuron. Second, the muscle fiber's impulses are conducted along its sarcolemma (plasma membrane), and along the infoldings of the membrane are called transverse tubules. The transverse tubules extend deep into the interior of the muscle fiber, where they are closely apposed to the sacroplasmic reticulum (a specialized smooth endoplasmic reticulum that surrounds the myofibrils). Then, the impulses conducted along the ... capillaries. Smooth muscle cells are long and spindle-shaped, and each contains a single nucleus. They also have actin and myosin, but they are not organized into sarcom...

• Word Count: 9019
• Approx Pages: 36
• Has Bibliography
• Grade Level: Undergraduate

... original pest. In the 1960s, wildlife biologists were puzzled when the gannet population on Bonaventure Island, Quebec, began to shrink. The shells of the gannets' eggs were too thin to protect the embryos. Only after the eggs had been analysed did the scientists identify the culprit DDT, which had been bioconcentrated through higher levels of the food web. ... , canola oil and baking soda have pesticidal applications and are considered biopesticides. At the end of 1998, there were approximately 175 registered biopesticide active ingredients and 700 products. Biopesticides fall into thre...

• Word Count: 2580
• Approx Pages: 10
• Grade Level: Undergraduate