3421 - Study guides, Class notes & Summaries

PSS 3421 Exam 1 Questions & Answers 2024/2025

Characteristics of living things -Be able to reproduce -Have cells -Be able to respond to stimuli -Obtain energy -Evolve -Homeostasis What is physiology? The study of the processes or functions of organisms and how living things work Basics on levels of organization Molecules--> cells--> tissues --> organs --> systems-->organisms Homeostasis Living things maintain this, process by which an organism maintains equilibrium or internal consistency Negative feedback -Main regulator...

PhospolipidsMost abundant membrane component Head contains negatively charged phosphate group (hydrophilic) Two nonpolar fatty acid tails (hydrophobic) Assemble into lipid bilayer with hydrophobic tails in the center and hydrophilic heads in contact with water Fluid - phospholipids held together by van der Waal's forces Cholesterolbetween phospholipids; prevents crystallization of fatty acid chains Maintains fluidity, esp. in cold temperatures Decreases permeability, esp. in warm temps Cold-in...

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Excitable Cells Capable of undergoing transient, rapid changes in their membrane potentials (action potentials) Nerve cells (neurons) receive, process, initiate and transmit messages Muscle cells contract Polarization Charges are separated across the plasma membrane Depolarization Vm becomes less negative. Repolarized Vm returns to resting potential after depolarization Hyperpolarized Vm is more negative than the resting potential Changes in Vm result from ion movement through ion channels ...

1. In the nervous system, the term membrane potential refers to the separation of charges across a biological membrane 2. Resting membrane potential is attributable primarily to the presence of ____________ channels in the plasma membrane voltage-gated 3. Calculate the equilibrium potential for potassium, the concentration of which is 4 mM extracellularly and 115 mM intracellularly R = 1.987 cal mol-1K-1, T = 310 K and F = 23,067 cal mol-1V-1 -90 mV 4. Given a pathway, potassium flows _______...

ECS1601 Assignment 04 semester 02 2022

HESI A2 MODULE SECTION II SET 2 MATHEMATICS (2021 Revised Exam Practice Guide Contains 50 Questions all answered from Set 2) 1. 8327 – 1278 = a. 7149 b. 7209 c. 6059 d. 7049 1. D 8327 – 1278 = 7049 2. 294 X 21 = 2. B a. 6017 b. 6174 c. 6728 d. 5679 294 X 21 = 6174 3. 1278 + 4920 = a. 6298 b. 6108 c. 6198 d. 6098 3. C 1278 + 4920 = 6198 4. 285 * 12 = 4. A a. 3420 b. 3402 c. 3024 d. 2322...

HESI A2 MODULE SECTION II SET 2 MATHEMATICS (2021 Revised Exam Practice Guide Contains 50 Questions all answered from Set 2) 1. 8327 – 1278 = a. 7149 b. 7209 c. 6059 d. 7049 1. D 8327 – 1278 = 7049 2. 294 X 21 = 2. B a. 6017 b. 6174 c. 6728 d. 5679 294 X 21 = 6174 3. 1278 + 4920 = a. 6298 b. 6108 c. 6198 d. 6098 3. C 1278 + 4920 = 6198 4. 285 * 12 = 4. A a. 3420 b. 3402 c. 3024 d. 2322...