Q1 of 38 Page 96

Observe the chart depicting the structure of a nephron.


i) Mention the structures A to F


ii) Explain the main function of a nephron.


i) A- Glomerulus


B- Bowman’s capsule


C- Proximal convoluted tubule


D- Loop of Henle


E- Distal Convoluted tubule


F- Collecting duct


ii) Nephron is the structural and functional unit of kidney. Their function is to filter substances from the blood, regulate blood pressure, blood pH and blood volume, control electrolyte and metabolite balance. Nephrons basically filter the blood and form urine.


More from this chapter

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15

Any change in the lifestyle, the food habits and the body form of an organism in order to make it comfortable in the environment / habitat, is called adaptation. Identify the suitable adaptation given below against each mammal.

i) conservation of body heat in large marine mammals like whale (Jaws are modified into baleen plates / Forelimbs are modified into flippers /


Fat is deposited in subcutaneous tissue.)


ii) Locating food source by bats-( Forelimbs are modified into wings / Hanging upside down using legs / Production of sounds and detection of the echo)


 16

The Master chemists of our body are the kidneys. Justify.

i) Kidneys filter all chemicals in the body.


ii) Kidneys maintain the chemical composition of blood.


iii) Kidneys eliminate all chemicals absorbed by the body.


iv) Kidneys store the chemicals accumulated in the body.


 2

With a suitable diagram, describe the structure and functions of the human heart.

 3

Draw the L.S of kidney and label the parts.