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PHYS4
Regulation of Body Temperature
| Question | Answer |
|---|---|
| Relate teh circardian rhymth to body temperature? What shape does it resemble? | Temp is high at day, low at night; like a parabola...:) |
| What are the four ways the body exchanges heat with the environment? | Radiation, conduction, conversction, and evaporation |
| Radiation involves? | Electromagnetic waves |
| Conduction? Gain or Loss of energy in our body? | Thermal energy during collison of molecules; GAIN energy |
| Convection? Gain or lose energy in the body/ | conductive heat aided by air or water; GAIN energy |
| TEMP REGULATION REFLEXES | TEMP REFLEXES |
| What controls temperature in the body? | Hypothalamus |
| What are we trying to balance in temp regulatioN? | Heat production (MR) and heat loss (external environment) |
| What detects these body temp changes? | Thermoreceptors |
| What kind of thermoreceptors are there and what do they detect? | Peripheral (skin) and central (hypo, spine, organs) |
| What kind of nerve output is the result of thermoreceptors sensing a change in temp | SNS: Sweat glands, skin arterioles, and adrenal meulla and MOTOR nerves--skeletal muscles |
| How do you alter heat production? | Increase muscle tone, shivering, activity |
| SHIVERING | SHIVERING |
| What causes shivering? Result of shivering? | Motor innervation; quick increase in heat production |
| What is a key considering in the heat loss by radioation, conduction , and convection? | The different in temp b/w skin and environment |
| How does skin temp decrease when it is cold? | reduce blood flow there by SNS |
| How does skin temp increase in response to heat? How much water evaporates from us per day?n | Skin temp increases by inhibiting vasoconstricition and activating SYMPATHETIC VASO DILA TION nerves. 600mL |
| Water for evaporation is supplied by? | SNS stimulate of sweat |
| What happens above thermoneutral zone? Below? | Above = Sweating; Below = increased heat production |
| What is acclimitization? | Person getting used to a temperature; not having as great of a decrease in temp when they go into a hot environment |
| How does HEAT acclimitzation get acheived? | Early sweat, more sweat, less salt in sweat |
| Onset of Fever steps? (four of them) | 1. Raise thermostat 2. Vasoconstriction and shivering 3. Increase body temp 4. Re-set set point, get better |
| What causes you to feel cold when your temp is actaully higher? | Mismathch b/w body temp and set point |
| Hyperthermia in excercise is due to? | Greater metabolic activity-->greater temp (NOT RE_SET POINT) |
| What receptors are activated? to dissipate heat | Center thermoreceptors |
| What brings on fainting? | Depletion of plasma volume (no sweat), vasodialtion-->hypotension due to decreased CO and TPR |
| How does evaporation work? | Use energy to transfer water from liquid-->gas, |
| What does evaporation yeild? An increase of heat or decrease of heat in the skin? | Decrease of heat. This process RELEASES heat |
| In acclimatization in response to heat, what happens? | 1. Sweat earlier, 2. Sweat more. 3. Less salt in sweat |
| Why do you have less salt in sweat? | Increased aldosterone secretion |
| In cold acclimatization the opposite of heat acclimatization? | NO!! |
Created by:
talkglitter2486