Ion gradients - Study guides, Class notes & Summaries

Straighterline BIO 201 Anatomy & Physiology I Graded Exam 1 (New Version June 2024) We are a team of experts offering class attendance for all Straighterline, Online ATI, HESI, NCLEX, Portage Learning, Sophia etc courses (including final proctored exams!!). We also write essays, discussion posts, research papers and school assignments. Should you need any of these services, Contact us via email: or : +1 (540) 753-5914. Guaranteed Passing!  BIO201_MH_V4  Topic 4: Genetics Question ...

AQA A LEVEL BIOLOGY Paper 1 2024 What is the function of the cell membrane? - ANS To control what enters and leaves the cell, acts as a barrier between the cell and its environment. What structural feature of the cell membrane allows substances to enter/leave? - ANS Partially permeable What is the fluid mosaic model? - ANS States that a membrane is a fluid structure (because phospholipids are constantly moving) with a "mosaic" of various proteins embedded in it Describe the...

What direction does sodium want to flow? Potassium? Correct Answer-Sodium: Wants to flow *into* cell Potassium: Wants to flow *out* of cell Which ion has the largest gradient? What direction will it want to flow? Correct Answer-Calcium has a huge gradient and will go down gradient *into* the cell if possible. What is a membrane potential? What is the relative charge difference between the outside and inside of a cell? Correct Answer-Voltage difference across their plasma membranes. The in...

sodium potassium pump - ️️enzyme that transports 3 sodium to the outside, and it transports 2 potassium to the inside using the hydrolysis of ATP - creates more sodium outside and more potassium inside and creates a concentration gradient Midline, ipsilateral and contrelateral - ️️line separating left and right of the entire nervous system - ipsilateral means the same side of something and contralateral means the opposite side of something Nissl stain showed (Nissl) - ️️Nissl u...

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

Why Does the Brain Need Blood? Consumes 15-20% of the body’s total energy needs, (and receives 15% of Cardiac Output), despite being only 2% of total body mass. Neurons require high ATP to:  Maintain Ion Gradients across Plasma Membrane  Regulate Neurotransmitter synthesis/re-uptake. Neurons have NO ANAEROBIC CAPACITY → Therefore the brain absolutely depends on Oxygenated Blood.  Hence, any deficit in blood supply is detrimental (≈30+sec lack of blood/O2 to brain → u...

PNB 2274 UCONN Exam 2 Tanner Questions And Answers Rated A+ Principles Electrostatic Attraction ANS - charge attraction - positively charged ions will be attracted to negatively charged ions Principles Chemical (diffusional) Gradients ANS - when a membrane is selectively permeable positively charged ions will flow to the one side making the other side negative due to leak channels. - making one side harder to diffuse with the outside of the cell because it is attracted to the more charg...

Nervous System - MCATSoma - correct answer neuron cell body Oligodendrocytes - correct answer cells that produce MYELIN in CENTRAL NERVOUS SYSTEM Schwann Cells - correct answer cells that produce MYELIN in the PERIPHERY Resting Membrane Potential - correct answer about -70mV inside of neuron is negative relative to outside Discuss ion concentrations inside neuron. - correct answer [K+] is high inside neuron [Na+] is low inside neuron Discuss ion concentrations outside neuron...

Bio 161 Exam 2- Penn State Questions and Answers Already Passed Question 1: What is the definition of current in the context of physiology? - a. movement of ions - b. flow of charged particles - c. chemical reaction - d. electrical discharge - Answer: b. flow of charged particles Explanation: Current refers to the flow of charged particles, such as ions, from one point to another, driven by an electrical potential or voltage. Question 2: What term is used to describe an el...

Branchlike parts of a neuron that are specialized to receive information - Answer-Dendrites The part of the neuron that contains the nucleus, which processes and integrates information - AnswerCell Body / Soma A threadlike extension of a neuron that carries nerve impulses away from the cell body - Answer-Axon Nerve - Answer-A bundle of axons makes up a ___ Branches of the axon that allow one neuron to pass the signal to multiple effectors - Answer-Axon Collaterals At the axon hillock - Ans...

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...