Home | About Us | pmtPHYSICS1. Two vectors of equal magnitude A on addition give a resultant vector of magnitude A. Then the magnitude of their difference vector is (a) (b) 2A(c) zero (d) 2. From the top of a tower 40 m high‚ a ball is projected upwards with a speed of 20 m s1 at an angle 30 with the horizontal. The total time of flight to hit the ground is (g = 10 m s2)(a) 8 s (b) 4 s (c) 6 s (d) 3 s3. To a boy in air‚ a fish in water viewed normally from air appears to be at 0.6 m from the surface
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It enables communication between the cell membrane‚ the nucleus and the environment. Carries ribosomes that are responsible for the production of proteins (rough). Synthesis lipids from fatty acids and glycerol and transports these to the Golgi body (smooth). Ribosomes – This binds to the rough
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forces: * Cell wall matric forces: Cell walls and intracellular inclusions such as mitochondria and ribosomes are characterized by the presence of membranes. These membranes possess charges that attract water molecules and contribute to the total cell water potential. In a salt solution‚ there are less water molecules for the membranes to attract‚ causing less water to be imbibed into the seed. * Cell osmotic concentration: The greater the concentration of soluble compounds
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so prolonged plateau is achieved. PHASE3(FINAL RE POLARIZATION) due to closure of calcium channels and continue loss of potassium makes the inside of cell more negative resulting in polarization. PHASE4(RMP) eventually cell returns to resting membrane potential due to K efflux and cell is ready for next cycle 6. Explain why the SA node generates action potentials at a frequency of approximately 100 beats per minute even though the average resting heart rate is 70 beats per minute. The average
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Physiology 1 ch-4‚5 1. ___________ is a term which describes a membrane that allows only certain molecules to penetrate it. A. Selective permeable B. Permeable C. Porous D. Counter transport 2. Active Transport A. Utilizes energy B. Cannot transport molecules against a concentration gradient. C. Cannot be saturated D. Requires cofactors 3. The Rate of diffusion is influenced by A. The concentration gradient B. Membrane permeability C. Membrane surface area D. All of the choices are correct 4. Cells
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cell isn’t intact you don’t want cell to divide and keep mutations going‚ to avoid inflammatory response (caused by cells that exploded/necrosis).. ect. Necrosis is triggered by something unplanned‚ leading to decrease ATP‚ pumps‚ atpase activity‚ membrane becomes permeable = lysis‚ Caused by trauma or cytotoxicity. Now all of these organelles and enzymes ect are in the neighboring cells which cause problems to healthy cells. By apoptosis you can get rid of cell without impact on neighbouring
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INTRODUCTION Infertility is one of the major economic issues challenging the dairy industry today [1]. Currently in the United States‚ expenses attributed to dairy cow infertility are estimated to exceed $350M per year [2]. Infertility is the absence of pregnancy after 12 months of breading attempt [3]. There are numerous causes of infertility in cattle‚ including infectious diseases‚ anatomical abnormalities‚ physical trauma‚ environmental toxins‚ and anovulation [4]. Among these‚ anovulation‚ or
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Chapter 48 Nervous Systems Lecture Outline Overview: Command and Control Center The human brain contains an estimated 1011 (100 billion) neurons. Each neuron may communicate with thousands of other neurons in complex information-processing circuits. Recently developed technologies can record brain activity from outside the skull. One technique is functional magnetic resonance imaging (fMRI)‚ which reconstructs a 3-D map of the subject’s brain activity. The results of brain imaging and other
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Diffusion and Osmosis Experiment Methods/Materials: 7.1 Experiment: Rate of Diffusion of Solutes In the initial set up of this experiment I had 2 sets of 3 screw-cap test tubes that had each been half-filled with 5% gelatin and 1-mL of the correct dye (either potassium dichromate‚ aniline blue‚ or Janus green) in each of the test tubes. I labeled the 3 test tubes of set 1 with which die they contained and marked them “5 ˚C”. Then with the other set I did the same exact thing‚ except I labeled
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therefore bound a membrane that acts the selective controller of the movement of different substances to and from the cell. This is especially when dealing with the solutes both to and from the cell. Some solutes must be allowed to move into and out of the cell depending on the need and urgency of the very solutes. This membrane is considered to selectively permeable to different solutes and thus will only allow the passage of specific solutes to and from the cell. This implies that the membrane to most cells
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