Homeostasis
ByAdmin
Week- 9 Homeostasis >>> Understanding the Brain: The Neurobiology of Everyday Life
1. Piloerection is accomplished by autonomic (sympathetic) contraction of smooth muscle at the base of hair follicles. When hairs stand up, they create a space where air is relatively stationary. This layer of air receives heat from the skin and keeps it there to form an insulating layer. Which of the following are true of piloerection?
2. Testosterone stimulates prostate cancer growth. Therefore men with prostate cancer often undergo therapy that antagonizes the effect of testosterone on the prostate. A high proportion of such men experience hot flashes. The thought is that the loss of testosterone (which can be converted to estrogen by aromatase) in men has the same effect as the lowered levels of estrogen in postmenopausal women. For men and women with hot flashes, which of the following happens first during a hot flash?
1 point
3. While a moderately elevated temperature (less than 39°C, less than 102°F) may be beneficial, higher body temperatures are dangerous. With that piece of information and using what you know about thermoregulation, which one of the following treatments would you choose first for a person with chattering teeth and a core temperature of 38°C (101°F)?
1 point
4. Which one of the following treatments would you choose first for a person with chattering teeth and a core temperature of 34°C (93°F)?
1 point
5. Which one of the following treatments would you choose first for a flushed and sweating person with a 0core temperature of 41°C (104°F) who seeks medical help after going for a run in the desert at noon during the summer?
1 point
6. Which of the following influence the timing of initiating urination? Check all that apply.
1 point
7. Neurons in the brain are sensitive to CO2 levels. In congenital central hypoventilation syndrome (CCHS), aka Ondine’s curse, a genetic mutation causes a loss of CO2 sensitivity in neurons in the pons. People with CCHS are challenged during exercise and typically must sleep with ventilatory (breathing) assistance. From what you know which of the following would you expect are working correctly in an otherwise healthy person with CCHS? Check all that apply.
1 point
8. What is the biggest influence on a person who stays up all night and then in the morning drinks a cup of coffee and stays up all day?
1 point
9. What is the biggest influence on a person who stays up all night and then falls asleep while driving at 10:00 in the morning?
1 point
10. What is the biggest influence on a person who works nights and falls asleep during work?
1 point
11. In neonatal mammals (including humans), urination is reflexive. Once the bladder fills up, the bladder muscle (named the detrusor) contracts and the external urethral sphincter relaxes. Young mammals (a few years old for humans) learn to control the external urethral sphincter. In adults, which of the following are true? Check all that apply.
1 point
12. People with sleep apnea are treated with continuous positive airway pressure (CPAP). This treatment provides a constant flow of air into the airway, preventing airway collapse. Which phase of breathing does CPAP aid?
1 point
