Q13 of 41 Page 206

Outline the functioning of kidney dialysis machine?

● The dialysis machine serves as artificial kidney.


● It is used for patients with damaged or dysfunctional kidneys.


● It filters blood and removes waste products and excess fluid from the body.


● It works on the principle of diffusion.


● It consists of semi-permeable tubes (made of cellophane) and a special dialyzing fluid.


● A small incision is made on the arm and a tube is connected. The blood is passed along the tubes placed in dialyzing fluid that filter waste products from the blood through diffusion.


● The filtered blood is transported back into the body.


More from this chapter

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11

What is the difference between excretion and defecation? Explain the process of excretion in humans.

 12

The given diagram shows parts of the urinary system of a mammal.


Identify the structures labelled A, B and C.

 14

Ritu learned that excretion removes harmful metabolic wastes, i.e. nitrogenous wastes from the body. Different processes are employed in varied organisms depending on body’s organisation.

Read the passage and answer the following questions.


(i) Why can’t diffusion be carried out as excretory process in multicellular organisms?


(ii) Aquatic animals usually excrete ammonia as excretory waste. Give reason.


(iii) List the values observed in Ritu.

 15

Rohan studied excretion in plants. He observed that the oxygen we breathe is actually a waste product of photosynthesis in plants. He wondered about other waste products and their uses. He was also bothered about the increased deforestation which disturbs the O2-CO2 balance of the environment. Read the above passage and answer the questions following.

(i) How do plants release gaseous wastes from their body?


(ii) Apart from oxygen, what other waste products are released by plants? Give two examples along with their use.