Ch. 5 - Membrane DynamicsWorksheetSee all chapters
All Chapters
Ch. 1 - Introduction to Physiology
Ch. 2 - Molecules and Molecular Interactions
Ch. 3 - Cells and Tissues
Ch. 4 - Cell Metabolism: Bioenergetics, Enzymes, and Respiration
Ch. 5 - Membrane Dynamics
Ch. 6 - Cell Communication
Ch. 7 - Integumentary System
Ch. 8 - Bone and Cartilage
Ch. 9 - Skeletal System
Ch. 10 - Joints
Ch. 11 - Muscles
Ch. 12 - The Nervous System I: Neurons and Neuronal Networks
Ch. 13 - The Nervous System II: The Central Nervous System
Ch. 14 - The Autonomic Nervous System
Ch. 15 - Sensory Physiology
Ch. 16 - The Endocrine System
Ch. 17 - Cardiovascular Physiology I: The Heart
Ch. 18 - Cardiovascular Physiology II: Blood, Blood Vessels, Circulation, and Exchange
Ch. 19 - The Urinary System
Ch. 20 - Respiratory Physiology
Ch. 21 - Acid-Base Balance-- Controlling Blood pH
Ch. 22 - Introduction to the Immune System
Ch. 23 The Lymphatic System
Ch. 23 - The Digestive System
Ch. 24 - Regulation of Metabolism and Energy Balance
Ch. 25 - Human Sexual Reproduction and Development

Concept #1: The Nernst Equation

Concept #2: Using the Goldman-Hodgkin-Katz Equation

Practice: Assume that, for a given cell: [Ca2+]extracellular fluid=120 mM and [Ca2+]cytosol=1.2 mM. Which of the following is true for this cell?

Practice: A typical neuron is sitting at Vrest=- 70 mV. Many Na+ channels in the neuron’s membrane open and stay open. [Na+]outside=150 mM and [Na+]inside=15 mM. After a new equilibrium is reached, you measure the new membrane potential. Which of the following is likely to be the value of that new membrane potential?

Practice: You discover an alien neuron and take some measurements. At rest, the membrane is most permeable to which ion?

Practice: A cell is initially at Vm=0 mV. The concentrations of K+ inside and outside the cell are: [K+]out=5 mM, [K+]in=150 mM. If a channel for K+ opens, will K+ flow into or out of the cell?

Practice: Complete the table for a cell with [Na+]out=150 mM and [Na+]in=15 mM.