Diffusion Essay Topics

Cell Transport Mechanisms and Permeability

1.Describe two variables that affect the rate of diffusion. a.Molecular weight  b.Solute concentration  2.Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? a.Urea was unable to diffuse through the 20MWCO membrane because urea is a big molecule and the… View Article

Cell Transport Mechanisms

Describe two Variables that affect the rate of diffusion. The two variables that affect the rate of diffusion are: A. The size of the molecule. The larger molecule will diffuse more slowly than the smaller molecule. B. The nature of plasma membrane. If the membrane is composed of lipid portion., only lipid soluble molecules can… View Article

Diffusion and Osmosis Shown In Solutions

This lab, title Diffusion and Osmosis, was centered around the diffusion across a cellular membrane and how exactly materials move and diffuse in concentrations. Both diffusion and osmosis are forms of movement that are part of passive transport dealing with cell membranes. Diffusion is where the solutes move from an area of high concentration to… View Article

The Rate of Diffusion

Abstract I found that this experiment gives me an understanding on how osmosis and diffusion works. In its simplicity, it explains the process that our bodies (mainly cells) use all the time. It also showed me that even with the temperature changing, it doesn’t drastically change the rate of diffusion. Introduction Diffusion is important in all living systems…. View Article

Gas Diffusion

OBJECTIVES: Determine the gas diffusion coefficient of acetone using the established Winkelmann’s method KEYWORDS Diffusivity, Gas Diffusion Coefficient, Winkelmann’s method OVERVIEW The knowledge of physical and chemical properties of certain materials is important because very often process engineering deal with the transformation and distribution of these materials in bulk. One such property is diffusivity. Mass… View Article

Bystander Effect

Psychology Interview Questionnaire 1. What is the bystander effect/diffusion of responsibility in your own opinion? 2. What is the Malaysian’s level of awareness towards the bystander effect? 3. How is the ‘bystander effect’ situation in Malaysia at the moment? 4. What are the factors that cause the bystander effect? 5. What triggers someone to help… View Article

Egg Lab Report

An egg is a model of a human because the egg has a cell membrane like humans do inside and outside of the body that let things pass through like water. We can use eggs to study the effect of changes in the external environment on the internal environment by having harsh environments like putting… View Article

Biology Diffusion Experiment

Title: What is the effect of concentration of acid on the rate of diffusion in agar blocks? Aim: To investigate how the concentration affects the rate of diffusion of hydrochloric acid through agar blocks Research Question: To determine how will different concentrations (0.1M, 0.2M, 0.3M, 0.4M, 0.5M) of hydrochloric acid affect the rate of diffusion… View Article

Review Sheet Results

1. Explain why increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels. Your answer: Because outside a typical cell, the concentration of K+ is about 5mM and the concentration of Na+ is about 150 mM. When you increase the concentration of K+ from 5 to 25… View Article

Agar Cubes Lab Report

Diffusion in agar cubes Introduction: All cells are dependent on a processes called diffusion, which is the movement of a substance from an area of higher concentration to an area of lower concentration. Cells need to obtain certain essential substances, like oxygen, for their survival. The rate of diffusion is said to be dependent upon… View Article

Diffusion across a Selectively Permeable membrane

Introduction: Diffusion is movement of molecules from one area of concentration to another. This process is vital for the life functions of cells. Cells have selectively permeable membranes that allow only certain solutions to pass through them. Osmosis is a special kind of diffusion that allows water to go through semi-permeable membranes of high water… View Article

Rate of Diffusion

To test the effect of molecular weight on the rate of diffusion, various experiments were performed. One of which is the glass tube test wherein cotton balls of the same size were moistened in two different substances (NH4OH and HCl). These cotton balls were plugged at each side of a glass tube. After some time,… View Article

Simulating Dialysis

Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? __ The molecules were to large to go through. My results matched._ 3.Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well… View Article

Effect of lipid solubility on permeability of plasma membrane

: To study the effect of lipid solubility of molecules on permeability of plasma membrane of animal cell. Introduction : Diffusion: In general, diffusion process occur when there is a concentration gradient between two region .Molecules (other than water) will move by diffusion as long as there is a concentration gradient. A concentration gradient exists when… View Article

Cell Transport Mechanisms and Permeability

Exercise1 Cell Transport Mechanisms and Permeability Name ____________________________________________________________ Lab Time/Date ______________________________ Activity 1 Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. * The size of the pores of the membrane * The size of the molecule diffusing through the membrane 2. Why do you think the urea was not… View Article

Cell Transport Mechanisms and Permeability

Simple Diffusion 1. The following refer to Activity 1: Simulating Dialysis (Simple Diffusion). Which solute(s) were able to pass through the 20 MWCO membrane? None of them did According to your results, which solute had the highest molecular weight? Albumin Which solute displayed the highest rate of diffusion through the 200 MWCO membrane? Na+CI Using… View Article

Physio Ex 9.0 Activity 1 Cell Transport Mechanisms and Permeability

ACTIVITY ONE- Cell Transport Mechanisms and Permeability: Simulating Dialysis (Simple Diffusion) 1. Describe two variables that affect the rate of diffusion. Molecular weight affects the rate of diffusion because the bigger the size of the molecule the longer it will take to diffuse. Membrane size is another variable that affects the rate of diffusion because… View Article

Transport of Solute in Solvent through Osmosis

Objective: The objective is to simulate passive transport: diffusion of solutes and osmosis of water through a semipermeable membrane (dialysis tubing). The experiment will show how molecules in solution move from areas of higher concentration to areas of lower concentration in the attempt to reach homeostasis in different circumstances. Introduction: The main purpose of this… View Article