Slave Colonies of the Seventee essays

Slave Colonies of the Seventee essays In Barbados and Jamaica (the sugar islands) sugar was a major crop. The owners of these sugar plantations were badly in need of laborers to work for them year round, and because the natives died off so speedily, they needed to bring in someone to do the grueling tasks for them. They tried to use indentured servants, but this was extremely difficult because sugar is a year round, demanding sort of crop and nobody sought after work on those plantations. Any person who had any other kind of alternative would choose to go anywhere else. Eventually they started importing slaves because they were not only cheaper, but easier to replace when they died, as most people who came to these islands did. By 1650, there were approximately 20,000 black slaves in Barbados; and by 1700, nearly as many as 45,000 black slaves in Jamaica (the prevalent sugar producer at this point in time). It was in these West Indian Islands that slavery not only got started for the English, but grew the fastest. South Carolina began as a colony of Barbados. They came there to cultivate crops such as rice and indigo. These settlers brought their slavery practices with them. This idea of growing rice worked well due to the fact that the slaves had experience prior to this experience working with it, and they were just in a good area for growing such a crop. By 1770, black people were nearly eighty percent of the population in South Carolina and the colony of Georgia. Tobacco production in the Chesapeake was growing due to an enormous demand for the product in England. The demand for tobacco in England had grown during the eighteenth century over ten times what it had been originally. With so much expansion in the plantations is was necessary to acquire as many people to work them as possible. In the beginning, indentured servitude was still used. In fact, it was the most common way for settlers to gain passage to America. Working in the Chesapeake wasn &apos...

Facts About Muscle Tissue

Facts About Muscle Tissue Muscle tissue is made of excitable cells that are capable of contraction. Of all the different tissue types (muscle, epithelial, connective, and nervous), muscle tissue is the most abundant tissue in most animals, including in humans. Muscle Tissue Types Muscle tissue contains numerous microfilaments composed of the contractile proteins actin and myosin. These proteins are responsible for movement in muscles. The three major types of muscle tissue are: Cardiac Muscle: Cardiac muscle is so named because it is found in the heart. Cells are joined to one another by intercalated discs, which allow the synchronization of the heartbeat. Cardiac muscle is branched, striated muscle. The heart wall consists of three layers: epicardium, myocardium, and endocardium. Myocardium is the middle muscular layer of the heart. Myocardial muscle fibers carry electrical impulses through the heart that power cardiac conduction.  Skeletal Muscle: Skeletal muscle, which is attached to the bones by tendons, is controlled by the peripheral nervous system and associated with the bodys voluntary movements. Skeletal muscle is striated muscle. Unlike cardiac muscle, the cells are not branched. Skeletal muscle cells are covered by connective tissue, which protects and supports muscle fiber bundles. Blood vessels and nerves run through the connective tissue, supplying muscle cells with oxygen and nerve impulses that allow for muscle contraction. Skeletal muscle is organized into several muscle groups that work in coordination to perform body movements. Some of these groupings include head and neck muscles (facial expressions, chewing, and neck movement), trunk muscles (moving the chest, back, abdomen, and vertebral column), upper extremity muscles (moving the shoulders, arms, hands, and fingers), and lower extremity muscles (moving the legs, ankles, feet, and toes). Visceral (Smooth) Muscle: Visceral muscle is found in various parts of the body including the blood vessels, the bladder, and the digestive tract as well as in many other hollow organs. Like cardiac muscle, most visceral muscle is regulated by the autonomic nervous system and is under involuntary control. Visceral muscle is also called smooth muscle because it doesnt have cross striations. Visceral muscle contracts slower than skeletal muscle, but the contraction can be sustained over a longer period of time. Organs of the cardiovascular, respiratory, digestive, and reproductive systems are lined with smooth muscle. This muscle can be described as rhythmic or tonic. Rhythmic, or phasic, smooth muscle contracts periodically and spends most of the time in a relaxed state. Tonic smooth muscle remains contracted for the majority of the time and only relaxes periodically. Other Facts About Muscle Tissue Adults have a certain number of muscle cells. Through exercise, such as weight lifting, the cells enlarge but the overall number of cells does not increase. Skeletal muscles are voluntary muscles because we have control over their contraction. Our brains control skeletal muscle movement. However, reflex reactions of skeletal muscle are an exception. These are involuntary reactions to external stimuli. Visceral muscles are involuntary because, for the most part, they are not consciously controlled. Smooth and cardiac muscles are under the control of the peripheral nervous system.