a) I) Arteries
-Thick muscular walls
_ No valves (except at bases of pulmonary artery and aorta)
-Narrow lumen
-Elastic walls
II) Veins
-Thin less muscular walls
-Have valves at regular intervals
-Wide lumen
-Less elastic walls
b) Arterioscerosis
johnmulu answered the question on May 3, 2017 at 07:46
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a) Name the antigens that determine human blood groups
b) State the adaption that enables the red blood cells to move in the blood capillaries.
(Solved)
a) Name the antigens that determine human blood groups
b) State the adaption that enables the red blood cells to move in the blood capillaries.
Date posted:
May 3, 2017
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Answers (1)
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a) Name one defect of circulatory system in humans
b) State three functions of blood other than transport
(Solved)
a) Name one defect of circulatory system in humans
b) State three functions of blood other than transport
Date posted:
May 3, 2017
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Answers (1)
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Why would carboxyhaemoglobin lead to death
(Solved)
Why would carboxyhaemoglobin lead to death
Date posted:
May 3, 2017
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Answers (1)
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The diagram below shows a vertical section through a mammalian heart.
(Solved)
The diagram below shows a vertical section through a mammalian heart.
a) Name the parts labeled A, B, E and F.
b) Give a reason why the wall of chamber C is thicker than chamber D
Date posted:
May 3, 2017
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Answers (1)
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Distinguish between natural and acquired immunity
(Solved)
Distinguish between natural and acquired immunity
Date posted:
May 3, 2017
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Answers (1)
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In what form is oxygen transported from the lungs to the tissues?
(Solved)
In what form is oxygen transported from the lungs to the tissues?
Date posted:
May 3, 2017
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Answers (1)
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a) The type of circulatory system found in members of the class insecta is
b) Name the blood vessel that transports blood from:
(Solved)
a) The type of circulatory system found in members of the class insecta is
b) Name the blood vessel that transports blood from:
i) Small intestines to the liver
ii) Lungs to the heart
Date posted:
May 3, 2017
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Answers (1)
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A person whose blood group is AB requires a blood transfusion. Name the blood groups of the donors
(Solved)
A person whose blood group is AB requires a blood transfusion. Name the blood groups of the donors
Date posted:
May 3, 2017
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Answers (1)
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Why are people with blood group O universal donors?
(Solved)
Why are people with blood group O universal donors?
Date posted:
May 3, 2017
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Answers (1)
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a) How may excessive bleeding results in death?
b) Name the process by which the human body naturally stops bleeding?
c) How can low blood volume be brought back to normal?
(Solved)
a) How may excessive bleeding results in death?
b) Name the process by which the human body naturally stops bleeding?
c) How can low blood volume be brought back to normal?
Date posted:
May 3, 2017
.
Answers (1)
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Describe the path taken by carbon dioxide released from the tissue of an insect to the atmosphere.
(Solved)
Describe the path taken by carbon dioxide released from the tissue of an insect to the atmosphere.
Date posted:
May 3, 2017
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Answers (1)
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State two ways by which Acquired Immuno deficiency syndrome (AIDS) virus is transmitted.
(Solved)
State two ways by which Acquired Immuno deficiency syndrome (AIDS) virus is transmitted.
Date posted:
May 3, 2017
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Answers (1)
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The diagram below shows a transverse section of a plant organ.
(Solved)
The diagram below shows a transverse section of a plant organ.
a) Name the plant organ from which the section was obtained.
b) i) Name the class to which the plant organ was obtained.
ii) Give a reason for your answer in (b)(i) above
Date posted:
May 3, 2017
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Answers (1)
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Why are the plants able to accumulate most of their waste products for long?
(Solved)
Why are the plants able to accumulate most of their waste products for long?
Date posted:
May 3, 2017
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Answers (1)
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Below is an illustration of a cross section of a plant showing the transportation of substances in the plant
(Solved)
Below is an illustration of a cross section of a plant showing the transportation of substances in the plant
a) Name the substances transported along the paths labeled K and L.
b) Give a reason for your answer in L above.
Date posted:
May 3, 2017
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Answers (1)
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State one adaptation of xylem vessels to their function.
(Solved)
State one adaptation of xylem vessels to their function.
Date posted:
May 3, 2017
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Answers (1)
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Explain how the following contribute to the movement of water up the xylem vessels:(a) cohesion (b) adhesion
(Solved)
Explain how the following contribute to the movement of water up the xylem vessels:
(a) cohesion
(b) adhesion
Date posted:
May 3, 2017
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Answers (1)
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Why are plants able to accumulate most of their waste products for long?
(Solved)
Why are plants able to accumulate most of their waste products for long?
Date posted:
May 3, 2017
.
Answers (1)
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The number of stomata on the lower and upper surfaces of two leaves from plant species X and Y were counted under the field of view of a light microscope. The results were as shown in the table below.
(Solved)
The number of stomata on the lower and upper surfaces of two leaves from plant species X and Y were counted under the field of view of a light microscope. The results were as shown in the table below.
a) Which of the two leaves would be expected to have a lower rate of transpiration?
b) Give a reason for your answer in (a) above
Date posted:
May 3, 2017
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Answers (1)
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The diagram below shows a transverse section of a plant organ.
(Solved)
The diagram below shows a transverse section of a plant organ.
a) Name the plant organ from which the section was obtained.
b) i) Name the class to which the plant organ was obtained
ii) Give a reason for your answer in (b)(i) above.
c) Name the part labeled X.
Date posted:
May 2, 2017
.
Answers (1)