brain III. Nerve Impulse Conduction A. Resting Potential 1. positive charge outside a. high sodium ion concentration 1) sodium pump 2. negative charge inside a. phosphate & sulfate ions b. negatively charged proteins c. high potassium concentration 1) potassium pump 3. potential difference = -70 mV B. Potential changes 1. –70 mV to 0 = depolarization 2. higher than –70 mV = hyperpolarizing C. Action Potential occurs when Threshold Potential achieved 1. causes
Premium Nervous system Neuron Action potential
REVIEW SHEET EXERCISE 6 Cardiovascular Physiology NAME: LAB TIME/DATE: 1. Define each of the following terms: • autorhymicity- The heart is autorhythmic. This means it generates its own rhythmic action potential independent of the nervous system. • sinoatrial node- is the impulse-generating (pacemaker) tissue located in the right atrium of the heart‚ and thus the generator of normal sinus rhythm. • pacemaker cells- are specialized cells that cause involuntary muscles and tissues to
Premium Action potential Parasympathetic nervous system Heart
Syllabus. Eliciting a Nerve Impulse Activity 1: Electrical Stimulation 1. Do you see any kind of response on the oscilloscope screen? Just a flat line. 2. What was the threshold voltage‚ or the voltage at which you first saw an action potential? 3.0 V 3. How does this tracing compare to the one that was generated at the threshold voltage? Very similar except that it’s peak is a little higher while it drops a little more as well. 4. What reason can you give for the change
Free Action potential Axon Nerve
to let an organism gain information about what is going on inside/outside body and how to respond to it. Three functions of the nervous system: • receive information; input • integrate information with past experiences; processing • Guide actions; output. Brain can adjust the impact of incoming information (can’t tickle oneself) Brain cells communicate by chemicals signals released by other cells. Made of separate cells Neurons: cells that are specialized to quickly respond to signals
Premium Neuron Nervous system Action potential
0 Activity 1‚ the simulation showed you how the resting membrane potential depends on the concentration of K+ and Na+ in the ECF. Some data were generated while measuring the resting membrane potential using a microelectrode that was positions alternatively in the ECF and the ICF. You recorded the data in Chart 1 on page 35. Use the data to produce a Graph that will clearly show how the effects ion the resting membrane potential when the ECF concentration of K+ is high and when the ECF concentration
Premium Action potential Nerve
energy Diversity of animals…more than 1 million species on earth Unifying themes that apply to all physiological processes Physiological Processes Chemical & Physical Laws Rooted in the laws of physics & chemistry Nerve conduction‚ action potentials & ionic currents Gas exchange Animal locomotion and blood flow Muscle contraction and limb movement Anabolic and catabolic metabolism What is Animal Physiology? (continued) Animal Physiology includes behavior‚ ecology‚ anatomy
Premium Action potential Signal transduction Neuron
receptor 2. All of the following are features of graded potentials except… a. decremental d. occur at dendrites b. sub-‐threshold e. can be inhibitory c. non-‐decremental Identify the following features of the action potential for a typical neuron. Be aware of the sequence of events.
Premium Nervous system Action potential Neuron
The Effects of Temperature on the Extracellular Firing Rate of Action Potentials in the Ventral Nerve Cord of the Periplaneta Americana Andrew Goldsmith (andrew.goldsmith@uconn.edu)‚ Tuesdays 1-4PM Section: 2 (Partner: Ana Charalambides) Abstract In polikiotherms it is known that the amount of locomotion varies based on the environmental temperature. We believe that this is caused by differences in the neural activity. We therefore investigated how temperature changes affect the extracellular
Premium Neuron Action potential Axon
------------------------------------------------- ------------------------------------------------- WAVE PROPAGATION ------------------------------------------------- ------------------------------------------------- EE3071 Laboratory 3 Location: S1-B4a-03 AY 2011/2012 Name: EMIR NUROV Matriculation number: U0920108K Group: LA03 1. Introduction 1.1 Propagation in Free-Space 1.1.1 Friis Transmission Equation To begin the derivation of the Friis Equation
Premium Electromagnetic radiation Radio Antenna
and the type of potential dependent on the following types of ion channels: Channels Areas on the Neuron Type of Potential Passive Dendrites‚ Cell body‚ & Axon Resting membrane potential Chemically gated Dendrites & Cell body Synaptic Potential Voltage gated Axon Hillock & Axons Action Potential 8. From the quiz‚ place an “X” by the characteristics of voltage-gated sodium channels. _____ Always open __X__ Found along the axon __X__ Important for action potential __X__ Opened and
Premium Action potential Neuron