Lab Topic: Movement of Materials Across the Cell Membrane—Potato Tuber Cells Introduction: Osmosis is a form of diffusion in which water diffuses through a selectively permeable membrane from a region of high concentration to a region of lower concentration. This form of diffusion takes place when the molecules in high concentration are too large to move through the membrane. Three factors that determine cell membrane permeability are shape‚ size‚ and polarity. For this experiment‚ it must
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Exercise 1: Cell Transport Mechanisms and Permeability: Activity 1: Simulating Dialysis (Simple Diffusion) Lab Report Pre-lab Quiz Results You have not completed the Pre-lab Quiz. 09/20/11 page 1 Experiment Results Predict Question: Predict Question 1: The molecular weight of urea is 60.07. Do you think urea will diffuse through the 20 MWCO membrane? Your answer : c. No‚ not at all. Predict Question 2: Recall that glucose is a monosaccharide‚ albumin is a protein with 607 amino acids‚ and
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Why Calcium nutrition is so important? Calcium is one of the most important minerals that body needs in order to function properly and to maintain optimal health‚ especially when it comes to bone. Calcium is used in so many ways throughout the body. It is necessary for contracting muscles‚ forming and strengthening bones and teeth‚ conducting nerve impulses throughout the body‚ blood clotting‚ maintaining a normal heart beat as well as other important processes. Calcium performs a number of basic
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Chapter 7: Membrane Structure and Function Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins 1. The large molecules of all living things fall into just four main classes. Name them. Explain what is meant when we say a molecule is amphipathic. 3. In the 1960s‚ the Davson-Danielli model of membrane structure was widely accepted. Describe this model and then cite two lines of evidence that were inconsistent with it. 4. Who proposed the fluid mosaic model of membrane structure
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neurons: iii. Interneurons: V. Membrane Potentials: a. Basic Principles of Electricity: i. Voltage: ii. Potential: iii. Current: iv. Resistance: v. Ohm’s law: b. Role of Membrane Ion Channels: i. Leakage‚ or nongated channels: ii. Chemically gated‚ or ligand-gated‚ channels: iii. Voltage-gated channels: iv. Mechanically gated channels: c. The Resting Membrane Potential: i. Resting membrane potential: 1. Polarized:
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glomerular capillaries and the Bownan’s capsule. A portion of the plasma is filtered into the capsular space due to the hydrostatic pressure of the blood. 8. The filtration membrane consists of fenestrated capillary endothelium‚ porous basementmembrane‚ and the photocyte (which contain filtration slits). This filtration membrane permits (large or small) molecules to be filtered. 9. Proximal tubule: The simple cuboidal cells of the proximal tubule are called brush border cells because they contain
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shorten but its tension increases is called isometric. 12) T 13) Muscle contraction will always promote movement of body parts regardless of how they are attached. 13) F 14) The effect of the neurotransmitter on the muscle cell membrane is to modify its permeability properties temporarily. 14) T MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 15) Calcium ions bind to the ________ molecule in skeletal muscle cells. B) troponin 16)
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end plate and causes a change in the ions permeability that creates graded depolarization of the end-plate potential. Basically‚ it attaches to the receptors in the motor-end plate and creates the beginning process of triggering muscle contractions. 3. Describe .the process of excitation-contraction coupling in skeletal muscle fibers.The motor unit meets at the neuromusclular junction‚ where the axon terminal of a neuron and muscle fiber’s plasma membrane meet‚ also called the motor
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the weight of the potato did not change after it was incubated in the solution with 0.4M. We also found that the potato was hypertonic to sucrose solutions of 0.0-0.3M and hypotonic to 0.5-0.6M. C. Dialysis Tubing Experiment We tested the permeability of the dialysis tubing to glucose‚ starch‚ and iodine. Initially‚ glucose and starch were placed into the bag‚ and iodine outside of the bag in the beaker. We used the iodine test for the presence of starch which proved positive inside of the
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between the vascular compartment or blood and the interstitial compartment though the semi-permeable capillary membranes‚ depending on the relative hydrostatic and osmotic pressures. -Hydrostatic pressure may be viewed as the “push” force and osmotic pressure as the “pull” or attraction force in such fluid movements. -A major factor in the movement of water through cell membranes is the difference in osmotic pressure between the cell and the interstitial fluids. Fluid Excess – Edema -Fluid
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