Question

1.) Some animals that live in the desert never drink water. They are able to survive by producing water from the foods they eat. How does this work? (Please describe this at the molecular level) 2.) A person eats a meal consisting of 180g of glucose. How many grams of carbon are in this meal? 3.) What happens to the carbon? (How is it eliminated from the body?) 4.) What happens to the hydrogens that are part of the glucose meal? (How are the hydrogen atoms eliminated from the body?)

Answer 1

1) The kidneys of these animals are highly efficient. They excrete almost solid urine. They have evolved adaptations in their body to allow salt concentration in their urine to be as high as 24%. Animals like kangaroo rats have complex passages in their nostrils that condense,collect and recycle moisture. Water is metabolically obtained from the seeds they eat.

2)72g(6×12)

3) Respiration mainly carbon dioxide released.

4) The main function of hydrogen ions are they keep the body hydrated as they are present as water mainly. They are removed by tubules that are part of the nephrons of kidneys. Excretion of H+ ions takes place with urine. A process called secretion takes place.