Concept explainers
Introduction:
The concentration of potassium ions (K+) is high in the intracellular fluid (ICF). It determines volume and intracellular osmolarity of the cell. It regulates resting membrane potential and depolarization of nervous and muscular systems with sodium. It serves as a co-factor for translation and is involved in other
Want to see the full answer?
Check out a sample textbook solutionChapter 24 Solutions
LSC (CONCORDIA UNIV ST PAUL) BIO 315/316: B&N DPF Connect with APR and Phils Online Access for Anatomy and Physiology: The Unity of Form and Function 180 Day Access ENTRP
- Define resting membrane potential and describe its electrochemical basis. Briefly discuss changes to resting membrane potential. Provide specific examples of how the 4 essential concepts relative to resting membrane potential or disruption of resting membrane potential.arrow_forwardThe resting membrane potential (RMP) is the voltage measured in a cell during resting state. It is particularly critical for the proper functioning highly excitable cells such as neurons and skeletal muscle cells. Identify the major ionic player then describe how it gives rise to and maintains RMP.arrow_forwardT-type calcium channels inactive rapidly. True Falsearrow_forward
- High Potassium can cause the symptoms seen in hyperkalemia. What about low potassium, known as hypokalemia? What affectwould hypokalemia have on the resting membrane potential and action potentials?arrow_forwardIf neurons fire action potentials when membrane potential reaches -50mV, how would hyperkalemia affect neuronal excitability (likelihood of the neuron firing action potentials)?arrow_forwardIn excitable cells, such as neurons, K+ is held at a much higher concentration inside the cell than outside. Which of the following would hold K+ at this concentration?arrow_forward
- Following a single action potential, cytosolic Ca2+ rises and then falls back to resting levels by about 50msec. Why does the force last so much longer?arrow_forwardSarin gas is an inhibitor of acetylcholinesterase used in chemical warfare. Briefly (in 1 sentence or less) explain how sarin causes: a) increased urination b) tachycardia (rapid heartrate)arrow_forwardassign KD to each ligand in the curve (0.03M, 0.005M, 0.015M, 0.045M)arrow_forward
- Sodium-potassium pumps contribute little to nerve cell membrane potentail Select one: True Falsearrow_forwardDefine electrochemical gradients and the term “polarized”, and describe the electrochemical basis of the resting membrane potential including the function of the sodium-potassium pump in maintaining the resting membrane potential.arrow_forwardWhich of the following occurs at this point of the membrane potential (marked by the black arrow) in autorhythmic cells? (A) A (B) B (C) C (D) Darrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning