13 Questions
What is the primary energy source that drives simple diffusion of molecules or ions through the cell membrane?
Energy from the normal kinetic motion of the substance
Which type of molecules or ions can move through intermolecular spaces in the cell membrane via simple diffusion?
Lipid soluble molecules such as O2, CO2, alcohol
What factors determine the rate of diffusion through a cell membrane?
Amount of substance available, velocity of kinetic motion, number and sizes of openings in the membrane
What is the primary difference between simple diffusion and facilitated diffusion?
Facilitated diffusion involves interaction with carrier proteins, while simple diffusion does not
Which type of molecules or ions can move through a membrane opening via simple diffusion?
Water and water-soluble molecules like ions, glucose, urea
What type of process is active transport across the cell membrane?
An energy-requiring process that moves substances against their concentration gradient
In facilitated diffusion, the rate of diffusion approaches maximum as the concentration of the diffusing substance increases. This is known as ________.
Carrier saturation
Which of the following substances are transported by facilitated diffusion?
Glucose
What controls the opening and closing of gates in protein channels through chemical gating?
Binding of a chemical substance with the protein
What distinguishes protein channels of the cell membrane?
Selective permeability
Which mechanism is responsible for eliciting action potentials in nerves?
Voltage gating
What movement requires a source of energy besides kinetic energy and moves substances against an energy gradient?
Active transport
Which substances are actively transported through some cell membranes?
Sodium ions, potassium ions, calcium ions
Test your knowledge about the chemical compositions of extracellular and intracellular fluids, as well as the process of diffusion in body fluids. Understand the constant motion of molecules and ions, and their behavior in solutions.
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