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- 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
- Briefly explain how any three factors affect population growth.(Solved)
Briefly explain how any three factors affect population growth.
Date posted: May 24, 2019. Answers (1)
- 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...(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.
(a) State the adaptation of the chloroplasts to photosynthesis.
(b) Name a mineral ion in chloroplast.
(c) (i) Name the tissues that translocates sugar from the leaves to other parts of the plants.
(ii) How is the tissue named in c(i) above adapted to its function?
(d) Write a word equation for the process of photosynthesis.
Date posted: May 24, 2019. Answers (1)
- In an experiment, a black mouse was mated with a brown mouse. All the offsprings in F1 generated were black. The offspring grew and were...(Solved)
In an experiment, a black mouse was mated with a brown mouse. All the offsprings in F1 generated were black. The offspring grew and were all allowed to mate with one another. The total number of F2 generation offspring were 96.
(a) Using letter B to denote the gene for black colour, work out the genotype of the F1 generation.(Use a punnet square)
(b) State the following for the F2 generation.
(i) Genotypic ratio.
(ii) Phenotypic ratio
(iii) The total number of brown mice.
Date posted: May 24, 2019. Answers (1)
- The figure below shows a light microscope.(Solved)
The figure below shows a light microscope.
(a) State the functions of the parts labelled 1, 2, and 3.
(b) (i) State two differences between an electron microscope and a light microscope.
(ii) Give one advantage of using a light microscope over that of an electron microscope.
(c) Calculate the magnification that is obtained when an object is viewed with a X10 eye piece and a X100 objective lens.
Date posted: May 24, 2019. Answers (1)
- Name the tissues which are responsible for growth in;
(i) girth
(ii) length(Solved)
Name the tissues which are responsible for growth in;
(i) girth
(ii) length
Date posted: May 24, 2019. Answers (1)
- The figure below represents three cells 1, 2 and 3.
Identify the three regions of the root tip from which the cell were got from?(Solved)
The figure below represents three cells 1, 2 and 3.
Identify the three regions of the root tip from which the cell were got from?
Date posted: May 24, 2019. Answers (1)
- The following diagram is a longitudinal section of the root apex.
Identify the parts labeled A, B and C.(Solved)
The following diagram is a longitudinal section of the root apex.
Identify the parts labeled A, B and C.
Date posted: May 24, 2019. Answers (1)
- What is meant by bivalent chromosome.(Solved)
What is meant by bivalent chromosome.
Date posted: May 24, 2019. Answers (1)
- The diagram below shows a phenomenon which occurs during cell division.
(a) Name the parts labelled X and Y.
(b) State the biological importance of the...(Solved)
The diagram below shows a phenomenon which occurs during cell division.
(a) Name the parts labelled X and Y.
(b) State the biological importance of the parts labelled X and Y.
Date posted: May 24, 2019. Answers (1)
- Give three examples of complex carbohydrates.(Solved)
Give three examples of complex carbohydrates.
Date posted: May 24, 2019. Answers (1)
- An experiment was carried out to investigate the growth response in a bean seedling as illustrated in the diagram below.
a) What type of response was...(Solved)
An experiment was carried out to investigate the growth response in a bean seedling as illustrated in the diagram below.
a) What type of response was being investigated.
(b) Explain the response exhibited by the root.
Date posted: May 24, 2019. Answers (1)
- Name two sex-linked characteristics in human determined by genes located on Y- chromosome.(Solved)
Name two sex-linked characteristics in human determined by genes located on Y- chromosome.
Date posted: May 24, 2019. Answers (1)
- The graph below represents the growth in a certain phylum.
(a) Name the type of growth pattern shown on the graph.
(b) Identify the process represented...(Solved)
The graph below represents the growth in a certain phylum.
(a) Name the type of growth pattern shown on the graph.
(b) Identify the process represented by X.
(c) Name the hormone responsible for the process in (b) above.
Date posted: May 24, 2019. Answers (1)
- What characteristics do mammalian lungs and the gills of bony fish have in common that enables them to exchange gases efficiently?(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. Answers (1)
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What is the importance of chewing food?
Date posted: May 24, 2019. Answers (1)
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State two adaptation of herbivorous which enable them to digest cellulose?
Date posted: May 24, 2019. Answers (1)
- Study the diagram below and answer the following questions.
(a) Name the muscles labelled A and B.
(b) What happens to each muscle as the arm...(Solved)
Study the diagram below and answer the following questions.
(a) Name the muscles labelled A and B.
(b) What happens to each muscle as the arm is straightened?
(c) Name the type of joint present in part labelled X.
Date posted: May 24, 2019. Answers (1)
- State the importance of the following features in gaseous exchange;
(i) The presence of cartilage in trachea and bronchi.
(ii) Alveoli, gill filaments and tracheoles being...(Solved)
State the importance of the following features in gaseous exchange;
(i) The presence of cartilage in trachea and bronchi.
(ii) Alveoli, gill filaments and tracheoles being numerous in the respective organisms where they occur.
Date posted: May 24, 2019. Answers (1)
- Give three prevention measures of cholera.(Solved)
Give three prevention measures of cholera.
Date posted: May 24, 2019. Answers (1)
- With a reason, name the organelles that would be found in large numbers in cell of secretory glands.(Solved)
With a reason, name the organelles that would be found in large numbers in cell of secretory glands.
Date posted: May 24, 2019. Answers (1)