Whats better for fat loss weight lifting or cardio work free essay sample

Nowadays, more and more people are starting to be aware of the seriousness of the obesity. Thus, people start to go to the gym workout, try to lose weight while building up the muscle to have them look fitter. Muscle, which came from the muscular system, it responsible every movement of the body. Skeletal muscle is one of the muscle tissue, and it is the only voluntary muscle tissue in the human body. Each time we perform a physical action, the muscle contraction will occur and produce tension that our body needs for physical activity, such as talk or excise. In this paper, I will be discussing how molecular mechanism occurs in the muscle during contraction and the role of ATP plays during the muscle contraction and relationship to the rigor mortis. Muscle contraction is the process to develop tension within the muscle tissue. Two of the key protein involved in the process of muscle contraction is the myosin and actin. We will write a custom essay sample on Whats better for fat loss: weight lifting or cardio work? or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page When myosin and actin interact, the shape of muscle cell will change. The theory that scientists come up with is the sliding filament theory, according to the A Dictionary of biology, it states that:â€Å"A proposed mechanism of muscle contraction in which the actin and myosin filaments of striated muscle slide over each other to shorten the length of the muscle fibers (see sarcomere). Myosin-binding sites on the actin filaments are exposed when calcium ions bind to troponin molecules in these filaments. This allows bridges to form between actin and myosin, which requires ATP as an energy source. Hydrolysis of ATP in the heads of the myosin molecules causes the heads to change shape and bind to the actin filaments. The release of ADP from the myosin heads causes a further change in shape and generates mechanical energy that causes the actin and myosin filaments to slide over one another† (Oxford University Press).In another word, when contraction occurs, actin filament will slide over myosin filament, this movement of protein will cause a shape change of the muscle cell, which produce tension and movement. Since skeletal muscles are voluntary cells, our brain will continuously be sending the commands and get stimulated by the nerve impulses. The signal that is being sent out from the brain is action potential, which is â€Å"stimulation of the cell by neurotransmitters or by sensory receptor cells partially opens channel-shaped protein molecules in the membrane. Sodium diffuses into the cell, shifting that part of the membrane toward a less-negative polarization† (propagated potential). There are three types of muscle contraction, depending on the muscle, and the reason for the contraction. isotonicCitation Pageâ€Å"Sliding filament theory.† Oxfordreference.com.proxy.library.csi.cuny.edu, Oxford University Press, 2008, www.oxfordreference.com.proxy.library.csi.cuny.edu/view/10.1093/acref/9780199204625.001.0001/acref-9780199204625-e-4101.â€Å"Propagated potential.† Academic.eb.com.proxy.library.csi.cuny.edu, academic.eb.com.proxy.library.csi.cuny.edu/levels/collegiate/article/action-potential/3611.

Alias grace dreams essays

Alias grace dreams essays I finished reading Alias Grace a couple of nights ago. I think one of the quotes from the blurb on the back read something like surely, this is as far as a novel can go and I think I agree. Not so much with the plot, which is still brilliant and involving, but by the sheer amount of technical skill Atwood demonstrates. Youll find a number of different writing methods styles that lesser novels pick one of and use all the way through like poetry, letters from characters to other characters and extracts from other (real life) texts of Grace Marks murder trial. What makes it all so impressive is that in one chapter you could be reading straight from the mind of Grace herself and then the next a number of letters from Dr. Simon Jordan (her fledgling psychologist) addressed to his mother, and it all seamlessly connects while feeling relevant to the story. And the story is an interesting one. I have the feeling I wouldve appreciated more if I had heard of Grace Marks or knew a little bit about the case before reading. Theres a sense that Atwood is writing for people who might have wondered about Grace Marks past and needed someone imaginative to fill in the gaps for them. But Atwood still does an excellent job of catering for the ignorant. Alias Grace is also a book that needs to be read all at once in a fairly short period of time; just to process all the information and keep events straight in your mind. My casual reading habits werent much help with that. But either way, like I said before, the book did what I wanted it to do: prove to me that Margaret Atwood is a bloody good writer. I think I now appreciate The Handmaids Tale a little more because it. Sigmund Freud (18561939) is universally considered the father of psychoanalysis, and many date the birth of psychoanalytic theory from the 1899 publication of The Interpretation of Dream...