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Excretion

Define excret...

Question

Define excretion. Name the excretory unit of a kidney.

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Solution

The process of removing waste products from the body of an organism is called excretion. The excretory unit of the kidney is nephron.

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(a) Define excretion.

(b) Name the basic filtration unit present in the kidney.

(c) Draw excretory system in human beings and label the following organs of excretory system which perform the following functions :

(i) forms urine.

(ii) is a long tube which collects urine from kidney.

(iii) Store urine until it is passed out.

Given below is a highly simplified diagram of the human kidney cut open longitudinally. Answer the questions that follow.

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(b) Name the functional units of the kidneys.

(c) Why does the cortex of the kidney show a dotted appearance?

(d) Mention two functions of the kidney.

(e) Write two differences in the composition of the blood flowing through the blood vessels, 'A' and 'B'.

Q. What is the excretory unit of human kidney called?

Q. Given below is a diagram of a human kidney cut open longitudinally Answer the following:
Figure

(i) Given definition of excretion.
(ii) Name the unit of kidney.
(iii) Why does the cortex of kidney show dotted appearence.
(iv) List the functions of the kidney.

Q. Why is excretion required? Name the components of the excretory system in humans.

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