Questions and answers on Man and his environment physiology
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عدد المساهمات : 9470 تاريخ التسجيل : 06/08/2009
موضوع: Questions and answers on Man and his environment physiology الجمعة نوفمبر 29, 2013 3:45 pm
Q: Outline 1-Baroreceptor mechanism in regulation of blood pressure 2-Chemoreceptor mechanism in regulation of respiration ==== A:
homeostatic system is formed of stimulus, receptor, center and response, thus:
1-Baroreceptor mechanism in regulation of blood pressure: Stimulus: increased arterial blood pressure. Receptor: baroreceptors ( receptors in carotid sinus and aortic arch respond to change in arterial blood pressure). Center: cardiovascular centers in brainstem. Response: decreased heart rate and vasodilatation to decrease arterial blood pressure towards normal.
2-Chemoreceptor mechanism in regulation of respiration: Stimulus: decreased arterial O2 and increased arterial CO2. Receptor: chemoreceptors ( receptors in carotid and aortic bodies respond to change in arterial O2 and CO2 concentrations). Center: respiratory centers in brainstem. Response: increased respiratory rate to increase O2 and decrease CO2 towards normal.
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عدد المساهمات : 9470 تاريخ التسجيل : 06/08/2009
موضوع: رد: Questions and answers on Man and his environment physiology السبت نوفمبر 22, 2014 6:49 am
Q: Mention effect of sweating rate on composition of sweat secretion?
Answer:
In eccrine sweat glands, the sweat is originally isotonic with blood plasma. When the rate of sweating is low, salt is conserved and reabsorbed by the gland's duct. High sweating rates, on the other hand, lead to less salt reabsorption and allow more water to evaporate on the skin to increase evaporative cooling.
Questions and answers on Man and his environment physiology
الجمعة نوفمبر 29, 2013 3:45 pm
