The term threshold as it applies to an action potential is the voltage at which you first observe an action potential. Define the terms skeletal muscle fiber, motor unit, skeletal muscle twitch, electrical stimulus, and latent period. Students gather data, analyze results, and check their understanding all on screen. In the extracellular solution just outside the cell body 2. The time between stimulation and the action potential differed because of the amount of myelination. The results did not support the prediction.
It increased for both patients. How well did the results compare with your prediction? Which respiratory process is impaired the most by emphysema? Which of the membranes can it pass through? A nerve is a bundle of axons, and some nerves are less sensitive to lidocaine. Sensory neurons have a resting potential based on the efflux of potassium ions as demonstrated in Activity 1. How does Mg2+ block the effect of extracellular calcium on neurotransmitter release? Yes Activity 3: Effect of Restricted Air Flow on Respiratory Volumes 1. This agreed with my prediction. Judging from the trace you generated, each inspiration took place over how many seconds? What is the approximate concentration of K+ inside a typical cell intracellular concentration? My results went well compared to my prediction because I predicted that the resting membrane potential would become less negative.
Each expiration took place over how many seconds? The dentist should inject the lidocaine in the nerve in the gums where the stimulus occurs to block pain perception. The thyroidectomized Tx rat is You correctly answered: c. Now that you have calculated the oxygen consumption per hour for this rat, you can calculate the metabolic rate per kilogram of body weight with the following equation note that you need to convert the weight data from grams to kilograms to use this equation. Now that you have calculated the oxygen consumption per hour for this rat, you can calculate the per kilogram of body weight with the following equation note that you need to convert the weight data from grams to kilograms to use this equation. Absolute refractory period is the interval at which the second action potential fails. The normal rat will become hyperthyroidic and develop a goiter.
Your answer: A threshold is a transmembrane potential at which an action potential begins. Describe two variables that affect the rate of diffusion. Which of the following has the most negative voltage? During moderate aerobic exercise, which… 963 Words 4 Pages causes the membrane potential to change to a less negative value. This neurotransmitter diffuses to the receiving end of an interneuron, where it binds to receptors and causes You correctly answered: d. Fewer intracellular K+ ions would result in the membrane potential being less negative. Your answer: If the extracellular K+ increases then the concentration of intracellular K+ will decrease causing a decrease in the steepness of the concentration gradient and fewer K+ ions would be drawn out.
The diaphragm moves to a flattened position. Fewer action potentials are recorded at R2 when lidocaine is applied because lidocaine blocks the voltage-gated Na+ channels between R1 and R2, which blocks the propagation of the action potential from R1 to R2. How well did the results compare with your prediction? Voltage-gated sodium channels are inactivated when the depolarized membrane potential is repolarizing and the K+ channels are open during this phase. Stimulus frequency refers to You correctly answered: b. Aldosterone release from the posterior pituitary gland is stimulated by decreased blood pressure and the need to reabsorb water into the blood to increase blood pressure. How well did the results compare with your prediction? Define the term threshold as it applies to an action potential. What is the effect of axon diameter on the conduction velocity? Which respiratory process is impaired the most by emphysema? I think this is wrong because an hour or a day should not decide wither the foetus.
I did not notice any pressure changes. PhysioEx allows students to repeat labs as often as they like, perform experiments without harming live animals, and conduct experiments that are difficult to perform in a wet lab environment because of time, cost, or safety concerns. Increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels because the membrane is permeable to K+ ions. Increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels because the membrane is permeable to K+ ions. How well did the results compare with your prediction? Your answer: Neither the Pacinian corpuscle or the free nerving have an isaomylacetate receptor protein. How well did the results compare with your prediction? As the pressure increased, the urine volume increased proportionally.
There were more pumps for transport. There are only a few Na+ leakage channels and usually diffuse inward due to the concentration gradient. When both arteriole radii changes were implemented, glomerular filtration rate and pressure rose above baseline values. Which of the following caused a change in membrane potential from -70 to -40 in the cell body? If you expand the ability of individual members of the organization, you expand the ability of the organization. Why does the frequency of action potentials increase when the stimulus intensity increases? Why did these values change as they did? After the student performs a step, instructions for the next step appear. During a single twitch of a skeletal muscle You correctly answered: b.
Would the response at R2 after lidocaine application necessarily be zero? Your answer: There weren't as many Na+ leakage channels as there were K+ leakage channels. Operating Strategy We shall place a lot of values on providing standard services to our customers by carrying out analysis…. The normal rat will become hypothyroidic and develop a goiter. At the axon terminal, each action potential causes the release of neurotransmitter. No they would be equal Does being unable to observe diffusion necessarily mean that diffusion is not taking place? The frequency of the action potentials is the reciprocal of the interspike interval with a conversion from milliseconds to seconds. How well did the results compare with your prediction? The nature of plasma membrane.
Which of the following statements about metabolism is false? Your answer: There was a very small response in the R1 receptor, but the other 3 showed no response. This protein only responds to chemical stimuli, in which the Pacinian corpuscle free nerven endings don't respond to. Your answer: The resting membrane potential is really a potential difference between the inside of a cell and the outside of the cell across the membrane. Explain why a change in extracellular Na+ did not significantly alter the membrane potential in the resting neuron? There are fewer sodium leak channels than compared to potassium leak channels and therefore the. How well did the results compare with your prediction? Why is the resting membrane potential the same value in both the sensory neuron and the interneuron? There are more negative charges than positive charges just inside the membrane.