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intestines relatively long/coiled /folded ;this allows food enough time for absorption.
Intestines long /have villi; to increase the surface area for absorption and digestion ;
The walls have glands which secrete enzymes for digestion;(examples of correct enzymes
e.g. Maltose, sucrose lactose etc).some glands /goblet cells also produce mucus; which protects
The intestinal wall from autodigestion/being digested; and reduce friction;
Intestines have opening of ducts which allows bile pancreatic juice into the lumen;
The intestines have circular and longitudinal muscle, whose contraction and relaxation/peristalsis;
Leads to mixing of food with enzymes/juice; facilitating rapid digestion and help push food along the gut; the intestines are well supplied with blood vessels to supply oxygen/ remove digested food from an efficient absorption and transporting system to move the food away from the small intestines;
Have lacteal vessels for transport of fat/lipid; have thin epithelial lining; to facilitating fast absorption /diffusion
marto answered the question on October 4, 2019 at 08:17
- The diagram below shows the effect of varying light intensity on the exchange of carbon IV oxide between the leaves of a green plant and...(Solved)
The diagram below shows the effect of varying light intensity on the exchange of carbon IV oxide between the leaves of a green plant and the atmosphere.
a) What is the name given to the point marked x?
b)
i) With reference to carbon IV oxide exchange state what happens at point x.
ii) Explain how the effect observed at point x occurs.
c) Explain why there is a net uptake of carbon IV oxide at light intensity above x.
d) What would happen to the plant if light intensity falling on it were maintained at x throughout?
e) What can you say about the exchange of oxygen between the plant and the surrounding air at intensities below x?
Date posted: October 4, 2019. Answers (1)
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The chart below shows the relationship between concentration of CO2 around the plant and the rate of photosynthesis.
(a) Account for the rate of photosynthesis between D-E
(b) Account for the rate of photosynthesis between F-G
(c) Briefly describe the reactions during the light stage of photosynthesis
Date posted: October 4, 2019. Answers (1)
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The diagram below represents a longitudinal section through the ileum wall.
a) Identify the structure labeled A and B
b) State one function of A and B
c) State two functions of the ileum
d) Explain the role of the liver in digestion
e) State the endocrine role of the pancreas in a mammal
Date posted: October 4, 2019. Answers (1)
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The figure below is a diagram of the anterior portion of the tapeworm. Taenia solium.
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Date posted: October 4, 2019. Answers (1)
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The figure shows the effect of temperature on an enzyme catalyzed reaction.
(a) Explain what happens between A and B
(b) What is X?
Date posted: October 4, 2019. Answers (1)
- The diagram below shows a leaf of a growing plant partly covered with aluminium foil.
The plant was placed in the sun from morning to midday...(Solved)
The diagram below shows a leaf of a growing plant partly covered with aluminium foil.
The plant was placed in the sun from morning to midday and then tested for starch.
(a) What was the aim of the experiment?
(b) State the observation made when the leaf was tested for starch.
Date posted: October 4, 2019. Answers (1)
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Name two products of light reaction used in the dark reaction.
Date posted: October 4, 2019. Answers (1)
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Date posted: October 4, 2019. Answers (1)
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Date posted: October 4, 2019. Answers (1)
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Date posted: October 4, 2019. Answers (1)
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Date posted: October 4, 2019. Answers (1)
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(a) Identify with reasons the mode of feeding of the animals whose dental formula is given above
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Date posted: October 4, 2019. Answers (1)
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State three ways by which the rate of enzyme controlled reactions can be increased.
Date posted: October 4, 2019. Answers (1)
- The concentration of carbon IV oxide in a tropical forest was measured during the course of 24 hour period from mid-night. The graph below shows...(Solved)
The concentration of carbon IV oxide in a tropical forest was measured during the course of 24 hour period from mid-night. The graph below shows the results obtained.
Account for the results obtained at:
(i) Midnight.
(ii) At 12.00 noon
Date posted: October 4, 2019. Answers (1)
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(b) State one way in which the dark reactions of photosynthesis depends on light reaction.
Date posted: October 4, 2019. Answers (1)
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(i) Name the most likely region of the alimentary canal of a mammal where enzyme B would be found.
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Date posted: October 4, 2019. Answers (1)
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(b) How is schistosome adapted to its parasitic mode of life?(Solved)
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(b) How is schistosome adapted to its parasitic mode of life?
Date posted: October 4, 2019. Answers (1)
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The diagram below represents a cell organelle.
(i) Name the part labeled y
(ii) State the function of the part labeled X
State the function of the vitamin named in (i) above
Date posted: October 4, 2019. Answers (1)
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Below is a process that takes place along the mammalian digestive system.
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Date posted: October 4, 2019. Answers (1)
- Briefly explain the fate of the following products from the light stage of the process of
Photosynthesis:
(a) Oxygen
(b) Hydrogen
(c) ATP(Solved)
Briefly explain the fate of the following products from the light stage of the process of
Photosynthesis:
(a) Oxygen
(b) Hydrogen
(c) ATP
Date posted: October 3, 2019. Answers (1)