During haemodialysis, the composition of the dialysis fluid (dialysate) and the design of the dialysis machine are carefully regulated to maintain homeostasis in patients with renal failure. Which of the following statements correctly describe these homeostatic features?

1. The dialysis fluid contains a glucose concentration equal to that of normal blood plasma to prevent the net loss of glucose from the patient's blood.
2. The dialysis fluid flows in the same direction as the flow of blood (concurrent flow) to ensure rapid equilibrium of urea is reached.
3. The dialysis fluid is maintained at body temperature ($37^{\circ }C$) to prevent the cooling of the patient's blood and to maintain a high rate of diffusion.