(a(i))[2]
Explain the term homeostasis with reference to sweating.
(a(ii))[4]
Explain how receptors and blood vessels in the man’s skin are also involved in homeostasis when he is in the hot kitchen.
(b)[1]
Sweat contains very small quantities of the waste product urea. State the name of the organ where most urea is produced in the body.
(c(i))[4]
Use the data in the table to compare the chemical composition of urine and blood plasma.
(c(ii))[3]
A patient has kidney disease and is about to begin dialysis treatment. Suggest and explain the concentration of urea in the sweat of the patient compared with that of a person who does not have kidney disease.