Skeletal System in the Human Body Assignment Example | Topics and Well Written Essays - 500 words - 3

Skeletal System in the Human Body - Assignment Example Diarthroses joint is a small space that exists between the articulating surfaces of the two joined bones. Since no other tissues grow in this cavity, the surfaces move freely against one another. Hence, they are functionally defined as freely movable joints. Some examples include ball and socket joints and hinge joints.Synarthroses joint does not have a joint cavity. Fibrous cartilage 'or bone tissues grow between the articulating surfaces of the two joined bones and make them unable to move freely against one another. Therefore, they are functionally defined as immovable (or slightly movable) joints that do not allow free movement. Examples include the skull joints. Motor nerves supply signals from the nervous system to the muscle system. A single motor nerve fiber that supplies to a group of muscle fibers within a muscle is called a motor unit.Skeletal muscles are more rapid in contracting than cardiac and smooth muscles. Skeletal muscles are important in locomotion and movement an d consequently are of greatest interest to the ergonomist. Glucose stored in the cell or diffused into the cell from the circulatory system can be broken down anaerobically to generate ATP for muscle contractions. The all-or-none law, states that once the threshold has been reached, an action potential will continue to completion where the membrane will depolarize and then re-polarize. The all-or-none law also applies to muscle fibers. For muscles, the law states that once adequately stimulated, a muscle fiber will contract completely. Not all the muscle fibers are necessarily stimulated at the same time stated earlier, smaller motor units are recruited first and then aggressively larger motor units until the desired strength is attained. Thus, not all the muscle fibers are necessarily contracted at the same time. Fatigue results in failure of a muscle to contract in response a stimulus. The segment of the lever between the point of force exertion and the fulcrum is called the force arm and, likewise, the segment between the resistance and the fulcrum is called the resistance arm.

Reading Journal Essay Example | Topics and Well Written Essays - 500 words - 4

Reading Journal - Essay Example The story continues when Lengel, who is the manager at the supermarket, comes and confronts the girls on their dressing at that time. Apart from being a manager, we are told he teaches at Sunday school to mean that he is a man of God. He condemns their dressing and even insists that it is against the policy of the supermarket to dress that way. That kind of dressing was meant for the beach. Because of this confrontation, Sammy sees this as an embarrassment to the women and in the juncture quits his job, and downs his work tools. This gesture is not noticed by any of the women. Lengel tries to persuade Sammy that it was going to be hard for him to without a job but he listens to none of that and walks out of the supermarket. This story is rich in themes that are outright from the events of the story. One of such themes is that of growing up in life. The story is told of a young man who is in his adolescent age of 19 years. The boy, Sammy, experiences adolescent changes and attraction to the opposite sex. Both Sammy and Stokesie react to the beauty of the women in the supermarket. They react to their appearance in a sensual manner by observing their moves and body features. The women are also in their youth probably the same age as that of Sammy. They dress in a way that the old like Lengel deem indecent but Sammy sees nothing wrong with it. This is shown by the event where Sammy wants to quit his job because he purports that the manager has embarrassed the girls. These issues happen to the youth as they grow up. They fail to distinguish love and relationship issues and end up making choices that are regrettable in a way. Sammy is infatuated with one of the women whom he nicknames as Queenie and he literally stares at her and even gets jealous of the way the woman blushes at Lengel’s confrontations. He is so crazy about the woman that when they have been â€Å"embarrassed† he gets annoyed and