Q3 of 41 Page 207

In the figure given below the structures associated with human kidneys are marked (X,Y and Z). The relative concentrations of urea in these structure is

The structures are labeled as:


X – Renal vein


Y – Renal artery


Z - Ureter


The renal artery (Y) carries oxygenated blood to the kidneys from the heart. This blood contains negligible amounts of waste products (such as urea). On the other hand, the ureters (Z) transport urine from the kidneys to the urinary bladder. The urine contains comparatively high amounts of urea to be excreted out. Thus, the relative concentration of urea in Y is always lower than that in Z.

More from this chapter

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1

Observe the figure given below which represents the control of water concentration in the blood.


This is a negative feedback

 2

The diagram given below shows the human excretory system.


Identify the function of part labelled as x

 4

The diagram given below represents the liver, kidney and some associated blood vessels. Identify the vessel from the labelled parts A-D in which the blood will contain the lowest concentration of urea?

 5

A healthy woman consumes a litre of water at once.

(i) How will be the internal environment of her body affected by this?


(ii) A corrective measure to bring the arising condition to normal state is?


Select the correct option for (i) and (ii) from those given below