measured through the amount of gravitational potential energy that the tennis ball had before it was dropped‚ and by the amount of work it had done when displacing the sand. As shown in Table 2‚ when the tennis ball was dropped at a height of 1 meter‚ it only possessed a potential energy of 0.569 J. When dropped from 5.5 meters‚ it held a potential energy of 3.217 J. This shows a positive correlation between the height of the drop and the amount of potential energy the tennis ball had. Also‚ shown in
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experiment was to examine how the compound action potentials propagate down the sciatic nerve of a frog based on varying stimuli. Before the nerve could be tested it needed to be extracted from the thigh of the frog and then submerged in saline. Several varying stimuli were used and recorded by a software package. The second experiment requires a constant stimulus with varying reference pin locations. From this the velocity of the action potential propagated can be determined. The experiment revealed
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-> soma -> axon -> synapse Lecture 2 – Chapters 4 & 5 Ion channels and signalling - ions are separated by cell membrane; when ion channels are opened‚ ions flow -> generating electrical signals -> so neurons can communicate info through these electrical signals - neurons generate a constant negative voltage across membrane: the rmp - an AP abolishes the –ve rmp‚ making membrane potential transiently positive - we can record and measure ion currents using electrophysiology - hyperpolarization is usually
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Neurophysiology of Nerve Impulses: Activity 3: The Action Potential: Threshold Lab Report Pre-lab Quiz Results You scored 25% by answering 1 out of 4 questions correctly. 1. Axons are You correctly answered: d. long‚ thin structures that extend from a neuronal cell body. 2. Which of the following is easier? Your answer : b. intracellular recordings of the action potential Correct answer: a. extracellular recordings of the action potential 3. An action potential is usually initiated in an axon at or near Your
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Virtual Lab Stimulation Exercise 3 Activities 1-5 Study online at quizlet.com/_cfevi 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. An action potential is an "all-ornothing" event. Explain what is meant by this phrase. This means that once the threshold is met‚ an action potential occurs. If the stimulus is too small an action potential does not occur. An action potential is usually initiated in an axon at or near what? The axon hillock‚ the initial segment‚ and the trigger zone. The adequate stimuli
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Polarization of the neuron’s membrane: cell membrane is surrounded by neurons as other cell has a membrane. If a nerve cell is not stimulated‚ the membrane is known to be polarized. For a neuron to be polarized‚ it is by maintaining excess of sodium ions on the outside of the cell and excess potassium ions on the inner part of the cell. A volume of sodium ions and potassium ions usually leaks through its channel but the sodium ions and potassium ions pumps on the membrane that restores the (k+) back
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Nerve Impulses: Activity 5: The Action Potential: Measuring Its Absolute and Relative Refractory Periods Lab Report Pre-lab Quiz Results You scored 50% by answering 2 out of 4 questions correctly. 1. Which of the following occurs after the peak of the action potential? Your answer : b. Voltage-gated K+ channels open. Correct answer: d. All of these occur. 2. What is meant by Na+ channel inactivation? Your answer : a. The Na+ channel opens when the membrane reaches threshold. Correct answer: b. The
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Aim: Investigate the effect of different temperatures and chemicals including various pH levels‚ alcohol and detergent on the cell membrane structure as well as function. Hypothesis: Increasing the temperature and pH levels which the beetroot membrane cells are exposed to will increase the amount of dye that passes out of the membrane. Materials: Part A • Bunsen Burner‚ Tripod and a Wire Gauze • 250mL Beaker • A 100° thermometer • Matches • 10mL measuring cylinder • Sticky labels and a Pen
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junction. Neuron (from the brain or spinal cord) will passed action potential through axon of motor neuron to an axon terminal. Sodium ion (Na+) and calcium ion (K+) are higher concentration outside than from the inside of the muscle and neuron. Na+ and K+ want to go inside but blocked by these channels (voltage gated calcium channels and ligand gated cation channels). The negative charge turn to positive charge after the action potential is at the terminal. This causes the calcium voltage gated channel
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investigation to find the water potential of potato and carrot tubers in a sucrose solution‚ of concentration 0.00 – 0.50Mol‚ over a 24 hour period Interpretation Written Communication C1 From our graph it can be seen that the concentration of sucrose solution is 0.18 M at 0% change in mass for the potato and 0.355 M at 0% change in mass for the carrot. I will use these values to find the solute potential by using the calibration graph. I will work out the water potential by using the equation‚
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