- Utra filtration takes place in the Bowman’s capsule.
- The efferent arteriole is narrower than theafferent arteriole ; making pressure in theBowmans capsule high. High pressure causes ultrafiltration to occur within the glomerulus ;
- The filtrate consists of urea, glucose, amino acids, mineral salts and water ;
- Large molecular particles such as plasma proteins and blood cells are not filtered ;
- In the proximal convoluted tubule useful substances such as glucose, amino acids, some water and vitamins ; are
selectively reaborbed into the blood by active transport and diffusion ;
- Selective reabsorption uses energy provided by the mitochondria found in cells lining the tubules ;
- In the loop of Henle, salts are reabsorbed into the blood by active transport ; water isreabsorbed by osmosis ;
- In the distal convoluted tubule, hydrogen ions are absorbed from the blood into the urine for excretion. This happens
when there is a high concentration of the ions in the blood ;
- Reabsorption of salts occurs under the influence of aldosterone ; and reabsorption of water occurs under the influence of the anti-diuretic hormone ; in the distole convoluted tubule salt and water are reabsorbed ; In the collecting duct water and mineral salts are reabsorbed ;
- The urine formed passes into the collecting duct which leads to the pelvis, then to theureter and to the bladder.
- Urea is not reabsorbed into the blood.
- In a healthy person, glucose and amino acids are completely reabsorbed into the blood.
- Reabsorption of water also takes place in the collecting duct by osmosis as the renal fluid flows down.
sharon kalunda answered the question on May 24, 2019 at 10:31
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Briefly explain how any three factors affect population growth.
(Solved)
Briefly explain how any three factors affect population growth.
Date posted:
May 24, 2019
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Answers (1)
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(Solved)
The figure below shows a section through a leaf. A leaf is designed for photosynthesis and this process provides a supply of simple sugars for a plant.
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Date posted:
May 24, 2019
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(Solved)
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Date posted:
May 24, 2019
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Answers (1)
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(Solved)
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Date posted:
May 24, 2019
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(Solved)
The figure below represents three cells 1, 2 and 3.
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Date posted:
May 24, 2019
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Answers (1)
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(Solved)
The following diagram is a longitudinal section of the root apex.
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Date posted:
May 24, 2019
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Answers (1)
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What is meant by bivalent chromosome.
Date posted:
May 24, 2019
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(Solved)
Give three examples of complex carbohydrates.
Date posted:
May 24, 2019
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(Solved)
Name two sex-linked characteristics in human determined by genes located on Y- chromosome.
Date posted:
May 24, 2019
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Answers (1)
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(Solved)
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Date posted:
May 24, 2019
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Answers (1)
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(Solved)
What characteristics do mammalian lungs and the gills of bony fish have in common that enables them to exchange gases efficiently?
Date posted:
May 24, 2019
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Answers (1)
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(Solved)
What is the importance of chewing food?
Date posted:
May 24, 2019
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(Solved)
State two adaptation of herbivorous which enable them to digest cellulose?
Date posted:
May 24, 2019
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State the importance of the following features in gaseous exchange;
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(ii) Alveoli, gill filaments and tracheoles being...
(Solved)
State the importance of the following features in gaseous exchange;
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Date posted:
May 24, 2019
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Answers (1)
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(Solved)
With a reason, name the organelles that would be found in large numbers in cell of secretory glands.
Date posted:
May 24, 2019
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Answers (1)
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The table provided below shows stomata distribution on leaves A and B and their surface area.
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(Solved)
The table provided below shows stomata distribution on leaves A and B and their surface area.
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(b) Give a reason for your answer in (a) above.
Date posted:
May 24, 2019
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Answers (1)
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(Solved)
Distinguish between Blood plasma and serum.
Date posted:
May 24, 2019
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(Solved)
Give two nitrogenous bases in a DNA molecule.
Date posted:
May 24, 2019
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(Solved)
State three sites of gaseous exchange in mesophytes.
Date posted:
May 24, 2019
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Answers (1)
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The diagram below shows an experiment on germination peas.
a) (i) What changes are observable at the end of the experiment?
(ii) Give the reason the...
(Solved)
The diagram below shows an experiment on germination peas.
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(ii) Give the reason the observation in a(i) above.
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Date posted:
May 24, 2019
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Answers (1)