Introduction Molecules are constantly in motion due to thermal energy. Therefore‚ the molecules will move around and bump into each other. Because of this‚ molecules tend to spread out evenly into available space in a process called diffusion. Diffusion is the random process of molecules moving from areas of high concentration to low concentration‚ thus requiring no energy. Many of the substances that enter or leave the cell do so through diffusion. Osmosis‚ a type of diffusion‚ is the movement
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of the following? You correctly answered: c. autorhythmicity 2. Phase 2 of the cardiac action potential‚ when the calcium channels remain open and potassium channels are closed‚ is called the You correctly answered: a. plateau phase. 3. Which of the following is true of the cardiac action potential? You correctly answered: b. The cardiac action potential is longer than the skeletal muscle action potential. 4. The main anatomical difference between the frog heart and the human heart is that the frog
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Resting potential is created by a transport protein called the sodium-potassium pump. Resting potential occurs when ions are distributed unequally on the inside and outside of cells‚ and when cell membranes are selectively permeable to different ions. K+ is particularly important for the resting potential. The membrane is highly permeable to K+. In addition‚ the inside of the cell has a high concentration of K+ and the outside of the cell has a low concentration of K+. K+ will naturally diffuse
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Osmosis and Water Potential Year 11 Emary Venter INTRODUCTION: The cell is the basic unit of living things‚ and is made up of multiple organelles. Organelles are membrane bound subdivisions‚ each specialised for a specific function. This experiment looks at the Plasma Membrane‚ which is a semipermeable layer surrounding the cell. It’s primary job is to control what goes in and out of the cell. Molecules can move across this membrane in either an active movement or a passive movement
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685N and your belongings have a weight of 915N. How much work does the elevator do in lifting you and your belongings 5 stories (15.2m)? Solution: W= (685N+915N) (15.2m) W= (1600N) (15.2m) W= 24‚320Nm or J Section 2 Gravitational Potential Energy: 6. A 0.15kg ball is thrown 9.0m straight up. What is the work done by the gravitational force? And what is the change in PE? (Notice anything?) Solution: PE= m*a*h PE= (0.15kg) (9.8 m/s^2) (9.0) PE= 13.23 kg m^2/s^2 or J - The
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Evaluate the potential impacts of two factors on the future of UK inbound and domestic tourism In this document I am going to be looking at the possible impacts that two factors have on the UK in terms of Inbound and domestic tourists and how this possess possible problems in the future and therefore help to predict possible outcomes in terms of tourism numbers and offer ways in which I think that the UK can overcome this and therefore maintain their inbound visitors numbers and increase domestic
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Resting membrane potentials Definition: Large nerve fibers when not transmitting nerve signals is about 90 millivolt. That is‚ the potential inside the fiber is 90 millivolts more negative than the potential in the extracellular fluid on the outside of the fiber. The Na+-k+ pump also causes large concentration gradients for sodium and potassium across the resting nerve membrane. These gradients are the following: Sodium ( outside): 142 mEq/L Sodium ( inside): 14 mEq/L Potassium ( outside):
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How to develop relationships with children and staff and why it is important Communicating effectively within the childcare setting is very important to enable strong relationship to build between colleagues‚ children and parents. Staff communicating positively with colleagues is an important part in helping build a strong and trusting relationship with each other. Developing close relationships with the other staff will help to inform each other of any worries or concerns that one of you may
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The history of cinema began with short films which were made before the appearance of feature films. Since then‚ short films experienced a difficult period surviving along with feature films until the mid 40s when double feature films became popular. In the 1950s short films had found a new place thanks to a rise of television. In the modern era‚ short films refer to “short subjects” and are made by independent film-makers with abundant themes. . “The furniture” is an Independent Lens Online Shorts
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Strategy‚ Management and Leadership Individual Report 1 Business-level Strategy of Nestle Nestle is an international brand with a portfolio in almost every food and beverage category. The brand is consumed daily by a majority of people‚ from its confectionary to it dairy brands and on to it’s beverages. With around 8000 brands it is hard to stay away from them. The company shows it’s size when figures such as 468 factories spread over 86 countries are some statistics‚ with the company employing
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