Ion gradients - Study guides, Class notes & Summaries

Biology Lecture Notes Y. Nagah 1 | P a g e Biology Lecture Notes (STEMer’s guide) 2024 Lecture (3) Resting potential – Action potential Mr. Youssef Nagah Biology Lecture Notes Y. Nagah 2 | P a g e Ion pump and ion channels establish the resting potential of a neuron As you know, ions are unequally distributed between the interior of cells and the fluid that surrounds them. As a result, the inside of a cell is negatively charged relative to the outside. Because the attraction of o...

Which ion has greatest influence on resting membrane potential? Potassium (potassium has more leak channels on the membrane than sodium, which is why potassium has a higher permeability value and has more impact of resting membrane potential) Concerning resting membrane potential, the inside of the membrane is _______ compared to the ________ charged outside. negative, positively. T or F: The diffusion of K+ and Na+ down their chemical gradients contributes to the resting membrane potenti...

What are sphingomyelins? - Sphingolipids where the head group is phosphocholine or phosphoethanolamine. What prevents cells from actually swelling? - It is effectively impossible for sodium to enter the cell (due to pump and lack of sodium channels). There is a high sodium ion concentration outside the cell which prevents water from entering in the cell Why would cells have a tendency to swell? - Because cytoplasm contains negatively charged proteins that cannot exit, so cells naturally ga...

GMS-6440 Medical Physiology Exam 1 Questions With 100% Correct Answers 2024 What chemical component of the plasma membrane prevents ions from readily and freely moving across the membrane? - answerLipids (phospholipids) Where is the concentration of [K+] greater? - answerIn the cytoplasm Across a cell's plasma membrane, movemen of water is a ___________ event. - answerPassive through a channel. Where is the concentration of [Na+] greater? - answerIn the extracellular fluid. For a neutra...

GMS 6440 Problem Set 2 Voltage and Concentration Gradients Exam questions and answers.

MLT ASCP Practice (medical laboratory technicians) Questions With Complete Solution / Guide -Graded A What single feature of normal RBCs is most responsible for limiting their life span? a. Loss of mitochondria b. Increased flexibility of the cell membrane c. Reduction of hemoglobin iron d. Loss of the nucleus [Accurate Ans: - d. Loss of the nucleus Intravascular or fragmentation hemolysis is the result of trauma to RBCs in the circulation. True or false. [Accurate Ans: - True Ext...

Based on Question 5: Know the typical electrical and concentration/chemical gradients that exist across the plasma membrane of a neuron for Na+, K+ and Cl-. Based on these gradients, be able to state what direction each ion moves across the membrane - -[Na+]out >> [Na+]in -[K+]out << [K+]in -Differences maintained by Na+ K+ ATPase pump; 3 Na+ ions out, 2 K+ ions in, creates a net loss of positive ions -resting membrane potential is -50 to -80 mV -for K+ and Cl-, concentration and...

GMS-6440 Medical Physiology Exam 1 Questions With 100% Correct Answers 2024 What chemical component of the plasma membrane prevents ions from readily and freely moving across the membrane? - answerLipids (phospholipids) Where is the concentration of [K+] greater? - answerIn the cytoplasm Across a cell's plasma membrane, movemen of water is a ___________ event. - answerPassive through a channel. Where is the concentration of [Na+] greater? - answerIn the extracellular fluid. For a neutra...

Bio 256 Actual Exam Questions with Correct Answers Signal Transduction Mechanisms - Answer-• Cell-‐cell contact signaling - important in normal development and immunity • Electrical signaling - voltage-‐gated ion channels in nerve and muscle tissue - Channel opens in response to a change in the membrane potential • Voltage across a membrane due to differential concentration and charges of ions inside/outside the cell • Chemical signaling - ligand gated ion channels dete...