A behavioral physiologist is studying the homeostatic control of blood pH. In a trial, a lizard runs on a treadmill for a set amount of time and the blood pH is measured. The blood pH drops as carbon dioxide is released into the bloodstream. Which component of the homeostatic feedback system is responsible for determining if the blood pH is far enough from normal that a response is necessary? Sensor Effector Assimilator Integrator

A behavioral physiologist is studying the homeostatic control of blood pH. In a trial, a lizard runs on a treadmill for a set amount of time and the blood pH is measured. The blood pH drops as carbon dioxide is released into the bloodstream. Which component of the homeostatic feedback system is responsible for determining if the blood pH is far enough from normal that a response is necessary? Sensor Effector Assimilator Integrator

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter15: Fluid And Acid-base Balance

Section: Chapter Questions

Problem 14UC

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1) As a physiologist, which of the following terms should you immediately associate with negative feedback regulation? Answer choices Constancy Relative constancy Relative constancy in interstitial fluid Relative constancy in intracellular fluid 2) Which of the following is true about physiological set-points? Answer choices They act as the integrating center in a negative feedback arc They represent the internal environment They are determined by the actions of the receptors and integrating centers They are constant They act as the effector in a negative feedback arc 3) What is the general purpose of negative feedback mechanisms? Answer choice a. to maintain a constant internal environment b. To anticipate changes in the environment c. To return a variable to its set-point d. To bring about the rapid change of a variable e. To detect changes in the external environment
a) Develop a Forrester Diagram, based on the schematic below, for blood temperature homeostasis. Consider four state variables. Keep in mind that the final goal of the model is to show how normal body temperature is re-established after a perturbation. Of note, if you draw your solution by hand make sure your scan is readable (not just a bunch of cell phone pictures) and converted to pdf Using an e-pencil is usually better, or ppt. Thermoregulation center in brain is activated. Temperature rises above normal. Sweat glands secrete sweat that evaporates, cooling the body. Blood vessels in skin dilate and heat escapes. Homeostasis: Internal body temperature of approximately 36-38°C Blood vessels in skin constrict, minimizing heat loss. Skeletal muscles rapidly contract, causing shivering which generates heat. Temperature falls below normal. Thermoregulation center in brain is activated. b) Write-up the equations (FDEs) for your Forrester Diagram. (Source: Biology on-line textbook.…
During rhythmic, moderately intense aerobic exercise, there is a redistribution of blood flow throughout the body. Which of the following statements is true? O beta-2 receptors cause dilation and increased blood flow to the exercising muscle there is a large increase in blood flow to the brain to keep you alert mean arterial pressure increases 5-8x due to a similar increase in total cardiac output blood flow to the kidneys and gut increases due to the presence of alpha-2 receptors
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Define homeostasis. What happens when homeostasis fails? List the three basic components of a control system and give an example. Describe the components of a reflex pathway. Contrast the response loop and the feedback loop. Explain the relationship between a regulated physiological variable and its setpoint. Is the physiological variable exactly at its setpoint? Compare and contrast negative and positive feedback. Give a biological example of each. Is the setpoint constant or can it change over time? If setpoints can change over time, what is this called? Chapter 2:
The Respiratory System and Urinary System work hand-in-hand to maintain blood pH. Depending upon the cause, each system will utilize mechanisms to increase or decrease pH levels. Sometimes, one system works sufficiently to alleviate the acidosis or alkalosis. At other times, both systems will work together to bring pH levels within normal range. Compensation is the term used to describe how one system assists the other in normalizing blood plasma pH. Respiratory compensation works quickly, using brainstem respiratory centers to eliminate or retain CO2 levels in the blood and works more quickly. Renal compensation takes more time, changes HCO3- levels and generally has a greater ability to restore normal pH values. Based on the information given for each of the cases below, indicate whether there is an alkalosis or acidosis present. Assume that appropriate time has lapsed to cause the lab results listed. 1. For each case, indicate whether the cause is…
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An athlete tested positive for Methylhexaneamine in urine with a level of 0.90 µg/mL. At her appeal in the Court of Arbitration, she quotes a highly respected scientific publication that states that at levels of 1.0 µg/mL there is no performance enhancement. If the athlete’s levels are indeed below this threshold, the athlete can face a year’s suspension instead of a ban for life. Use the Estimate of Uncertainty to determine if the Athlete should be given a 1 year suspension or banned for life.
When a person is in a state of heat exhaustion, trying to reduce body temperature is a priority over trying to maintain MAP. With this in mind, explain why people in a state of heat exhaustion have a rapid heart rate, but low stroke volume.
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