must be a) moving. b) falling. c) high above the ground. d) at rest. Answers: A Question 7: A book is at rest on a tabletop. One student calculates the potential energy as 15 J. Another student calculates the potential energy as 20 J. Which statement is correct? a) One or both of the students must have calculated the potential energy incorrectly. b) Both answers could be correct. c) Both answers are wrong because they use the wrong units. Answers: b Question 8: TRUE or FALSE: An
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each component‚ and 2. find the potential difference across each component. The rules of circuit analysis are called Kirchhoff’s rules. The Loop Rule This rule asserts that the net change in electric potential around any closed loop in a circuit is zero. This is a statement of energy conservation‚ since a charge that moves around any closed DIY First-Year Physics Laboratory Kirchhoff’s Rules path and returns to its original point must have no change in potential energy. If we apply this conservation
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Exercise 3: Neurophysiology of Nerve Impulses: Activity 1: The Resting Membrane Potential Lab Report Pre-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. What is the approximate concentration of K+ inside a typical cell (intracellular concentration)? You correctly answered: a. 150 mM 2. What is the approximate concentration of K+ outside a cell (extracellular concentration)? You correctly answered: b. 5 mM 3. What is the approximate concentration of Na+ inside
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NAME: 1. Match each of the definitions in Column A with the appropriate term in Column B. Column A Column B __D__ term that refers to a membrane potential of about -70 mv __F__ reversal of membrane potential due to influx of sodium ions __B__ major cation found outside of a cell __A__ minimal stimulus needed to elicit an action potential __E__ period when cell membrane is totally insensitive to additional stimuli‚ regardless of the stimulus force applied __C__ major cation found inside
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in the membranes of cells due to the presence of neurotransmitters that alter the ionic concentration inside the cell. Moreover‚ inside the neuron proteins and ions are negatively charged . This difference in ion concentration also produces a potential difference between the outer membrane and within the cell . The value reached is about -70 millivolts (negative inside with respect to the value of positive charges outside ) . This variation between the exterior and interior is achieved by the
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terms depolarization and action potential mean the same thing? Action potential is a quick depolarization followed by a repolarization. Depolarization is a one way trip. It also takes a substantial depolarization to cause an action potential. 2. What was the threshold voltage in Activity 1? 3.0 V 3. What was the effect of increasing the voltage? How does this change correlate to changes in the nerve? there was a slight increase 4. How did the action potential generated with the unheated rod
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Muscle Cell at rest: As the muscle cell is at rest it has a resting potential of -90mV. The K+ is all located inside the cell‚ the Na+ is located outside of the cell and the Ca2+ is located inside the sarcoplasmic reticulum. All leak channels and pumps are closed at this point. Muscle Cell stimulated by Acetylcholine: A motor neuron releases Acetylcholine which diffuses toward the muscle cell across the neuromuscular junction. As the Acetylcholine binds to a receptor on the muscle
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increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your prediction? Your answer: Because outside has more K+‚ the rate of diffusion is less. The resting membrane potential will become less negative. 3. Explain why a change in extracellular Na+ did not significantly alter the membrane potential in the resting neuron? Your answer: Because it did not effect the resting membrane potential. 4. Discuss the relative permeability
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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
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negative water potential to an area of more negative water potential. However‚ the water potential of the potato strip may not be zero‚ hence osmosis may either occur from the potato strip to the solution or vice versa. It is hoped through the experiment‚ the effects of osmosis of different stages on the potato strips would be explained‚ hence getting a better understanding of osmosis and its effect. It is also hoped that from the experiment the method to knowing the water potential in a certain
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