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a) Weakened or defective valve in veins; causing blood, body fluid/ tissue fluid to accumulate; leading to swelling or flabby veins.
b) When exposed to air, they rupture/ burst, releasing thromboplastin/ thrombokinase enzyme that initiate clotting process by neutralising heparin, which is anticlotting factor in the blood.
johnmulu answered the question on May 3, 2017 at 08:58
- The diagram below shows blood circulation in a mammalian tissue.(Solved)
The diagram below shows blood circulation in a mammalian tissue.
a) Name the part labeled P and Q.
b) Name the substances that are:
i) Required for respiration that move out of capillaries;
ii) Removed from tissue cells as a result of respiration
c) Name one component of the blood that is not found in the part labeled P.
Date posted: May 3, 2017. Answers (1)
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Red blood cells are adapted to their function. Explain three ways in which they are adapted to their function.
Date posted: May 3, 2017. Answers (1)
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Explain why it is not advisable to be in a poorly ventilated room with a burning charcoal stove
Date posted: May 3, 2017. Answers (1)
- a) State three structural difference between arteries and veins in mammals.
b) Name a disease that causes thickening and hardening of arteries (Solved)
a) State three structural difference between arteries and veins in mammals.
b) Name a disease that causes thickening and hardening of arteries
Date posted: May 3, 2017. Answers (1)
- a) what is a single circulatory system
b) Name an organism which has single circulatory system
c) Name the opening to the chamber of the heart of an insect (Solved)
a) what is a single circulatory system
b) Name an organism which has single circulatory system
c) Name the opening to the chamber of the heart of an insect
Date posted: May 3, 2017. Answers (1)
- 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. Answers (1)
- a) What prevents blood in veins from flowing backwards?
b) State two ways in which the red blood cells are adapted to their function. (Solved)
a) What prevents blood in veins from flowing backwards?
b) State two ways in which the red blood cells are adapted to their function.
Date posted: May 3, 2017. Answers (1)
- 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. Answers (1)
- Why would carboxyhaemoglobin lead to death (Solved)
Why would carboxyhaemoglobin lead to death
Date posted: May 3, 2017. Answers (1)
- 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. Answers (1)
- Distinguish between natural and acquired immunity (Solved)
Distinguish between natural and acquired immunity
Date posted: May 3, 2017. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
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Why are people with blood group O universal donors?
Date posted: May 3, 2017. Answers (1)
- 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)
- 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. Answers (1)
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State two ways by which Acquired Immuno deficiency syndrome (AIDS) virus is transmitted.
Date posted: May 3, 2017. Answers (1)
- 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. Answers (1)
- 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. Answers (1)