Control Of Water And Ion Content Of The Body
Muhtasari
Breathe onto a cold window and a patch of mist appears. That water was inside you a moment earlier, and nothing you decided put it there. Spend an afternoon working in the sun and your shirt dries into a faint pale crust, which is what stays behind when the water in sweat evaporates and the dissolved salts do not. Neither loss asked your permission and neither of them ever stops.
This lesson follows water, dissolved ions and a little waste out of the body by the three routes that carry them: the lungs, the skin and the kidneys. You will learn exactly which substance leaves by which door, why two of those doors cannot be closed however short of water you are, what the small word excess is doing in the phrase excess water is removed via the kidneys, and how to set a day of intake against a day of losses accurately enough to work out a volume nobody measured.
Malengo
- Water leaves the body via the lungs when we breathe out and the skin when we sweat. Excess water is removed via the kidneys in the urine.
- Urea and ions are lost via the skin when we sweat. Excess ions are removed via the kidneys in the urine.
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Maelezo ya Somo
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Control Of Water And Ion Content Of The Body. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- By which route is water lost from the body but ions are not? A. The lungs B. The skin C. The kidneys D. The liver Answer: A
- Which substances are lost from the body in sweat? A. Water only B. Water and glucose only C. Water, ions and a small amount of urea D. Ions and urea only Answer: C
- What is removed from the body by the kidneys in the urine? A. All of the water and all of the ions in the body B. Excess water and excess ions C. Excess water only D. Excess ions only Answer: B
- What decides how much water is lost from the skin? A. How much water the body has to spare B. How many ions there are in the food eaten that day C. How hot the body is D. How fast the person is breathing Answer: C
- In one day a woman takes in 2600 cm3 of water in total and loses 1100 cm3 by routes other than urine. The water content of her body does not change. What volume of urine does she produce? A. 1100 cm3 B. 1500 cm3 C. 2600 cm3 D. 3700 cm3 Answer: B
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