ch29: env cond

Question 1

wha controls thermoregulation

Answer 1

hypothalamus

Question 2

what activates heat-regulating mechanisms

Answer 2

1- stimulation of peripheral thermal receptors in the skin
2- changes in blood temperature as it flows through the hypothalamus

Question 3

radiation

Answer 3

loss of heat from a warmenr object to a cooler object in the form of infrared waves

Question 4

factor affecting skin sweat evaporation

Answer 4

• skin surface exposed to the env
• temp and relative humidity of the ambient air
• convective air currents around the body

Question 5

hydration parameters

Answer 5

• preercersie: 500-600ml 2-3h before
  200-300ml 10-20min
• exercise: 200-300ml every 10-20min
• postexercise: within 2h 150% of weight loss

Question 6

miliaria rubra vs miliaria profunda

Answer 6

r- seen in humid climates or with skin totally covered by clothing. sweat glands are occluded with organic debris and can no longer produce sweat for evaporation

rubrA= heat rash is localized
profound = cond becomes more generalized and prolonged

s/s
- inflamed, itchy skin

Question 7

raynauds syndrome

Answer 7

• caused by underlying didease or anatomical abnormality, source often unknown
• fingers become cold, pale and numb
  followed by hyperemia w/ redness, throbbing pain and swelling

Question 8

degrees of frosbite

Answer 8

1st= skin is soft to the touch and appears initially red, then white, and usually painless. typically noticed by others first

2nd= skin is firme to the touch, but tissue beneath is soft and initially appears red and swollen. Diffuse numbness maybe preceded by an itchy or prickly sensation. white or waxy skin color may appear later

3rd= skin is hard to the touch,, totally numb, and appears blotchy white to yellow-gray or blue-gray