t is a warm, summer day and you are out for a walk. Suddenly, you hear a dog bark. You turn, and see a dog the size of you running toward you. Describe in simple terms, the physiological responses of the nervous, endocrine, cardiovascular and respiratory systems to this stimulus.
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It is a warm, summer day and you are out for a walk. Suddenly, you hear a dog bark. You turn, and see a dog the size of you running toward you. Describe in simple terms, the physiological responses of the nervous, endocrine, cardiovascular and respiratory systems to this stimulus.
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- The diagram in Figure 5 shows the difference between negative feedback and positive feedback. Negative feedback Receptor Effector Departure from Return to resting level Resting level Positive feedback Further departure from resting level Receptor Effector Departure from Resting level FIGURE 5 Explain why negative feedback is important in homeostasis. Explain how negative feedback enables the carotid and aortic bodies and the medulla to maintain a constant blood carbon dioxide level. It is said that the initiation of an Action Potential is an example of positive feedback. With reference to the process involved, state why you think this statement is accurate?Unlike real life, pandemics in the movies often involve people turning into zombies - in which case many of us would need to run for our lives. Running for your life from zombies requires you to sense and respond to danger. Describe how your sensory, nervous, and endocrine systems would function together to help you survive a zombie apocalypse, including the specific organs, cells, tissues, molecules and/or processes involved.Positive feedback loops are used in chemical messaging in the body. Below is a list of steps that describe how a positive feedback system works in chemical messaging. The list is out of order. Placed the list in the proper order. 1. A sensor in a persons finger senses a change in the bloodstream. 2. The chemical messenger triggers the production of a specialized protein in the finger in response to the original signal. 3. A chemical messenger is released from the brain and travels to the finger. 4. As the specialized protein is made in the finger, it triggers the production of even more specialized protein. 5. The brain determines that conditions are no longer in homeostasis.
- Select the statements that correctly describe positive feedback pathways. 1. A sensor/receptor is required to monitor and limit levels. 2. A sensor/receptor is unnecessary to monitor and limit levels. 3. Feedback prevents homeostasis. 4. Feedback contributes to homeostasis. 5. Feedback stimulates the effector to continue to do the same thing. 6. Feedback stops the effector from doing one thing and stimulates it to do the opposite. 7. When the target level for a hormone is reached, feedback results in a reduction of that hormone being released. 8. When a target level for a hormone is reached, feedback results in an increase of that hormone being released. Record your answers in ascending (lowest to highest) order.Select the statements that correctly describe negative feedback pathways. 1. A sensor/receptor is required to monitor and limit levels. 2. A sensor/receptor is unnecessary to monitor and limit levels. 3. Feedback contributes to homeostasis. 4. Feedback prevents homeostasis. 5. Feedback stimulates the effector to continue to do the same thing. 6. Feedback stops the effector from doing one thing and stimulates it to do the opposite. 7. When the target level for a hormone is reached, feedback results in an increase of that hormone being released. 8. When the target level for a hormone is reached, feedback results in a reduction of that hormone being released. Record your answers in ascending (lowest to highest) order.b) The diagram in Figure 5 shows the difference between negative feedback and positive feedback. Negative feedback Receptor Effector Departure Return to resting level from Resting level Positive feedback Further departure from resting level Receptor Effector Departure from Resting level FIGURE 5 i) Explain why negative feedback is important in homeostasis.
- 4. The graph in Figure 4 shows changes in blood glucose concentration after a meal. A B D E F. 150 Blood glucose concentration/ mg per 100 cm3 100 50 30 60 90 120 150 180 210 Time/minutes played hockey meal eaten FIGURE 4 a) Explain with respect to specific hormones, the changes in glucose concentration in EACH of the stages A to F. Clearly identify each stage.For the following physiological events, identify the following components of homeostatic control Variable Stimulus Receptor Input Control center Output Effector Response Thyrotropin-releasing hormone (TRH) is a hormone regularly released by the hypothalamus. Once released, it then stimulates the anterior pituitary gland causing it to release thyroid stimulating hormone (TSH). TSH then stimulates the thyroid gland to release the hormones T3 and T4. T3 and T4 have two main effects. First, they increase overall metabolism. Secondly, T3 and T4 can bind to these receptors on the hypothalamus and anterior pituitary, inhibiting the production of TRH and TSH respectively.Which of the following is the correct definition of positive feedback? a The process by which the body neglects homeostasis. b A mechanism in which the body's response to a stimulis opposes the stimulus. c A mechanism whereby the body responds to a stimulus by acting to enhance the stimulus d The dynamic equilibrium maintained by an integrating center which causes an effector to respond to the stimulus received by the receptor.
- If a person is given an experimental drug, which response would indicate that this drug is an norepinephrine/epinephrine agonist? decreased blood pressure pupil constriction constriction of respiratory airways high blood sugar (hyperglycemia) decreased heart rateWhat component of control mechanism produces a response in the body? Group of answer choices stimulus control center receptor effectorsThe autonomous nervous system regulates involuntary functions of the body and can be subdivided into the sympathetic and the parasympathetic nervous system. Both of these systems control the same group of body functions, but have opposite effects on the functions they regulate. The sympathetic nervous system prepares the body for intense physical activity like the fight-or-flight response. The parasympathetic nervous system has the opposite effect and relaxes the body and inhibits or slows many high energy functions. Which of the following involuntary effects in the body are brought about by the sympathetic nervous system during a fight-or- flight situation? i. Increased salivation ii. Increased digestion ii. Loss of bowel and bladder control iv. Body shivering Сrying Pupil dilation B. i, iv and v V. vi. A. i, ii and vi C. iii, iv and vi D. iii and v