three phases known as the latent‚ contraction‚ and relaxation phase. • threshold - the threshold is the minimal stimulus needed to cause a depolarization of the muscle plasma membrane (sarcolemma.) The threshold is the point at which sodium ions start to move into the cell (instead of out of the cell) to bring about the membrane depolarization. • treppe - the progressive increase in force generated when a muscle is stimulated at a sufficiently high frequency • summation - When a muscle is stimulated
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If the temperature of the sucrose solution in the beaker increases‚ then the percent change from diffusion will increase as well. III. Materials and Procedures a. 4 250mL beakers 1 M sucrose 1 M glucose Dialysis tubing String Balance Thermometer Hot Plate Ice b. Fill 4 dialysis tubes 2/3 of the way with 1 M glucose solution. Fill 4 beakers with 100 mL of 1 M sucrose. Weigh all four bags before placing them into beakers. Record temperature of room temperature sucrose and place one bag
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how to live with one day-to-day‚ and how to care for a PICC line. What is a PICC Line? A PICC line stands for Peripherally Inserted Central Catheter (Treatments & Procedures‚ 2015). What this means is that a PICC line is tubing running into a vein that is in your arm. This tubing is called cannula; it is flexible‚ soft‚ small in diameter and thin. It may be uncomfortable when first inserted‚ but once it is in place‚ it should not be painful. That patient will just have to be careful with it to ensure
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Matthias Schleiden concluded that all plants were made up of cells. Theodor Schwann stated that all animals were made up of cells. Rudolf Virchow concluded that new cells could be produced only from the division of existing cells. Janet Plowe demonstrated that the cell membrane is a physical structure‚ not an interface between two liquids. Lynn Margullis proposed the idea that certain organelles were once free living themselves. Cell Theory: All living things are composed of cells. Cells are the basic units of structure and function in living things
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Title : The movement of substances across a semi permeable membrane Objective : To study the movement of substances across a semi permeable membrane Problem statement : What factor influences the diffusion of substances through a semi permeable membrane? Hypothesis : The diffusion of molecules across a semi permeable membrane is based on the size of the molecule Variables: a) Manipulated : Size of solute molecules b) Responding : Colour of solution c) Fixed : Temperature and time
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too great to diffuse through the membrane. After the 2nd activity : Simulating Dialysis What happens to the urea concentration in the left beaker (the Patient)? It diffused to the right beaker Why does this occur? The excess amount must be diffused to reach equilibrium. 3rd exercise :Facilitated Diffusion At ta fiven concentration‚ how does the amount of time it takes to reach equilibrium change with the number of carriers used to “build” the membrane? The time needed decreases Does
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Chapter 5: Solutions‚ Colloids‚ and Membranes Chapter Summary Mixtures and Solutions * A mixture maintains its identity regardless of the proportions of its components. * A mixture can be separated into its pure components through physical separation techniques. * The components are distributed uniformly throughout a homogenous mixture. * The components are not distributed uniformly throughout a heterogeneous mixture. * A solution is composed of a solvent and one or more solutes
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imple Diffusion 1. The following refer to Activity 1: Simulating Dialysis (Simple Diffusion). Which solute(s) were able to pass through the 20 MWCO membrane? According to your results‚ which solute had the highest molecular weight? ______________________________________ Which solute displayed the highest rate of diffusion through the 200 MWCO membrane? __________________________ Using the data from Chart 1‚ explain the relationship between the rate of diffusion and the size of the solute. Facilitated
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explored are dialysis and gel filtration chromatography. In the remaining two experimental procedures‚ colorimetric assays will be used to detect the presence of certain carbohydrates. Glucose oxidase and Iodine Reactions will be performed in conjunction to demonstrate the procedure of such assays. Results [R1]: Table 1.0 - Quantitative Results for the Concentration (g/L)‚ Mass (mg) and Absorption Collected From the Separation of a Glucose and Starch Solution by Dialysis. A cellophane dialysis tube (1
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First let’s explore the city limits. Most animal cells will be patrolled by cilia or by flagella‚ both are made out of nine pairs of microtubules. Next in the tour the cell membrane which goes around the city and monitors what will enter and leave the cell. The function that allows for this to happen is called selective permeability. The cytoplasm which has inside of that the cytoskeleton made up of protein strands to back up the cell‚ kind of like a body guard. Centrosomes put the microtubules together
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