There are more negative charges than positive charges just inside the membrane. Gas pressure inside the lungs is lowered. The action potential at R1 or R2 stayed the same as I increased the stimulus above the threshold voltage. The hypophysectomized Hypox rat is You correctly answered: a. What change in membrane potential depolarization or hyperpolarization triggers an action potential? Which of the membranes can it pass through? Thyroxine is You correctly answered: c. Which respiratory process is impaired the most by emphysema? What does lidocaine do to voltage-gated Na+ channels? The nature of plasma membrane.
Submit this completed document by the assignment due date found in the Syllabus. My results did not compare well with my prediction because I predicted that the peak value of the action potential would increase. Sensory neurons respond to an appropriate sensory stimulus with a change in membrane potential that is You correctly answered: b. Identify which of the stimulus modalities induced the largest amplitude receptor potential in the Pacinian corpuscle. If the depolarization that reaches the axon is large and suprathreshold, the result in the axon is You correctly answered: c. The threshold voltage changes by increasing in the relative refractory period, during this time a second action potential can be produced if the stimulus intensity is increased.
Inactivation as it applies to a voltage-gated sodium channel means some voltage-gated sodium channels inactivate after the peak of the action potential. Services Our business principles shall rely on Quality, Honesty, Truth and Integrity. How well did the results compare with your prediction? It is a type of diffusion. Your answer: Stimulus intensity describes the amount of force generate Stimulus frequency refers to the rate of delivered stimulus to the muscle 2. Each expiration took place over how many seconds? Hint: What variable was changed in the procedure? Your answer: Compared to the conotrol extracellular fluid, the neurotransmitter Mg2+ was released in a very small amount. Your answer: The free nerve ending would likely respond to green lights. When the intensity of the stimulus is increased, the size of the action potential does not become larger.
How well did the results compare with your prediction? There also appeared to be more K+ channels open. This is caused by the flow of ions following the concentration gradient of traveling from an area of high concentration to areas of low concentration. My results went well compared to my prediction because I predicted that the resting membrane potential would become less negative. The results appeared to support the prediction. 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. What is the difference between stimulus intensity and stimulus frequency? Absolute refractory period is the interval at which the second action potential fails.
Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. Your answer: When the stimulus intensity increased, the number of synaptic vesicles increased with the intensity. Describe what happened when you applied a strong stimulus to the sensory receptor. Thyrotropin-releasing The normal rat is You correctly answered: c. Therefore, the K+ ions will diffuse down its concentration gradient from a region of higher concentration to a region of lower concentration. There are two potassium's for every sodium so the increase of potassium will make it more negative. 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 increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels. It had a peak value of -30mv and an amplitude response of 40mv. The levels were a little off. Predict Question 2: What do you think will happen after you inject thyroxine into the three rats? Record your data here: Stimulus Latent voltage:… 1262 Words 6 Pages Activity 1 1. The larger molecule will diffuse more slowly than the smaller molecule.
How the arrests happened and provide details about why and how the cop went about arresting riley. How well did the results compare with your prediction? Inhaler medications for an asthma patient are designed to You correctly answered: b. What is the approximate concentration of K+ inside a typical cell intracellular concentration? 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. The part of the neuron that was investigated in this activity was the axon. As the interval between the stimuli decreases, the threshold for the second action potential increased.
Submit this completed document by the assignment due date found in the Syllabus. The results did not support the prediction. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. Why is it harder to generate a second action potential during the relative refractory period? The threshold for the second action potential increased when the interval was decreased. This is because only partial repolarization has occurred, and only a greater than normal stimulus can cause an action potential to occur.
With increased pressure and the valve closed, the filtration rate decreased but the glomerular pressure stayed the same. How well did the results compare with your prediction? How well did the results compare with your predictions? Activity 8 Review Sheet Results 1. It helps the company to evaluate their product and sometimes identify what are some features that must be included when developing a new product. When the radius of the afferent arteriole was decreased, the pressure and the filtration rate both decreased. What type of sensory neuron would likely respond to the green light? Your answer: When a weak stimulus was applied to the sensory receptor, there was a very small response in the R1 receptor, but none at R2, R3, and R4.
Why does the frequency of action potentials increase when the stimulus intensity increases? Give one possible explanation for this. How well did the results compare with your prediction? Thyroid-stimulating… 1586 Words 7 Pages the molecule. Which of the following statements about metabolism is false? The results did not support the prediction. The sodium channels are mostly closed during the resting state. Students are also asked to make predictions about the results for an experiment to apply what they have learned before seeing the results.