Compare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.
ALVEOLI |
NEPHRONS |
Alveoli are the tiny air sacs made up of squamous epithelium, which are present in the lungs for the exchange of gases. |
Nephron is the structural and the functional unit in the kidney and has elongated tubule like structure helps in the excretion process. |
It has thin wall for the exchange of gases – carbon dioxide and the oxygen. |
It is composed of Bowman’s capsule, distal and proximal convoluted tubule and the Loop of Henle for the excretion process by crossing the collecting duct and ejection of waste material occurs through the urethra. |
Numerous alveoli in the lungs show the maximum area for the exchange of gases between the air in the alveoli and into the blood in their surrounding capillaries and diffusion of oxygen occurs through this way. |
Nephron regulates the fluid balance or the water balance by eliminating the excess water from the blood by converting them into the urine. So, balancing of fluid regulates the blood pressure. |
Alveoli balance the carbon dioxide and the oxygen ratio. Oxygen goes from the lungs to the bloodstream and carbon dioxide gets eliminated from the bloodstream to the lungs through the capillaries which are located in the wall of the alveoli. |
By eliminating the acidic substances, excess water, minerals and salts and the nitrogenous waste from the blood; this maintain the volume, composition, pH and the osmotic pressure of the body fluids known as fluid homeostasis. |
Gaseous exchange in the alveoli is a passive diffusion process across the surface. |
Excretion is also a passive process primarily and secretion is an active process. |
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How is the amount of urine produced regulated?
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(a) cytoplasm. (c) chloroplast.
(b) mitochondria. (d) nucleus.
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Where do plants get each of the raw materials required for photosynthesis?
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What is a good source of energy?
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What changes can you make in your habits to become more environment-friendly?
What is the difference between a reflex action and walking?
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If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is
(a) towards south (b) towards east
(c) downward (d) upward
What effect does the concentration of H+(aq) ions have on the nature of the solution?
The position of three elements A, B and C in the Periodic Table are shown below –
Group 16 Group 17
- -
- A
- -
B C
(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
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Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.
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Which of the statements about the reaction below are incorrect?
2PbO(s) + C(s) → 2Pb(s) + CO2(g)
(a) Lead is getting reduced.
(b) Carbon dioxide is getting oxidised.
(c) Carbon is getting oxidised.
(d) Lead oxide is getting reduced.
(i) (a) and (b)
(ii) (a) and (c)
(iii) (a), (b) and c
(iv) all
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(a) mass (b) speed
(c) velocity (d) momentum
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What is the difference between displacement and double displacement reactions? Write equations for these reactions.