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1. Veins have valves which helps to prevent backflow of blood since the blood moves with low pressure.
2. Veins have narrow lumen on their walls which enables blood to flow in low presurre.
0704577605 answered the question on February 13, 2018 at 22:16
- (a)Name two cardiovascular diseases. (b)If the nerve supply to the heart of a mammal is severed the rhythmic heart contraction and relaxation will go on and...(Solved)
a)Name two cardiovascular diseases.
(b)If the nerve supply to the heart of a mammal is severed the rhythmic heart contraction and relaxation will go on and heart continues to beat. Explain why.
Date posted: February 10, 2018. Answers (1)
- Name the respiratory sites of the following:
(i) Fish
(ii) Insects (Solved)
Name the respiratory sites of the following:
(i) Fish
(ii) Insects
Date posted: February 10, 2018. Answers (1)
- Differentiate between gaseous exchange and ventilation. (Solved)
Differentiate between gaseous exchange and ventilation.
Date posted: February 10, 2018. Answers (1)
- State one adaptation of the following parts of mammalian eye.
(i) Fovea centralis.
(ii) Sclera.
(iii) Cilliary body.(Solved)
State one adaptation of the following parts of mammalian eye.
(i) Fovea centralis.
(ii) Sclera.
(iii) Cilliary body.
Date posted: February 10, 2018. Answers (1)
- a)Define the term natural selection.
(b)Name three evidence of organic evolution. (Solved)
a)Define the term natural selection.
(b)Name three evidence of organic evolution.
Date posted: February 10, 2018. Answers (1)
- List down the roles of lipids in the body(Solved)
List down the roles of lipids in the body.
Date posted: February 10, 2018. Answers (1)
- Give five functions of peptides(Solved)
Give five functions of peptides
Date posted: February 10, 2018. Answers (1)
- Name three animals in phylum chordata?(Solved)
Name three animals in phylum chordata?
Date posted: February 9, 2018. Answers (1)
- Explain physical barriers that mediate natural immunity(Solved)
Explain the physical factors that mediate natural immunity.
Date posted: February 8, 2018. Answers (1)
- Explain the various conditions necessary for germination(Solved)
Explain the various conditions necessary for germination
Date posted: February 8, 2018. Answers (1)
- Name three supportive tissues in plants. (Solved)
Name three supportive tissues in plants.
Date posted: February 6, 2018. Answers (1)
- a) Distinguish between homologous and analogous structure.
b)Explain the term continental drift as used in evolution.(Solved)
a)Distinguish between homologous and analogous structure.
b)Explain the term continental drift as used in evolution.
Date posted: February 6, 2018. Answers (1)
- (a) Define polyploidy.
(b) Name three disorders resulting from gene mutations. (Solved)
(a) Define polyploidy.
(b) Name three disorders resulting from gene mutations.
Date posted: February 6, 2018. Answers (1)
- State two adaptations of Guard cell to its function in plant tissue.(Solved)
State two adaptations of Guard cell to its function in plant tissue.
Date posted: February 6, 2018. Answers (1)
- State the functions of the following organelles.
(i) Centriole.
(ii) Nucleolus.(Solved)
State the functions of the following organelles.
(i) Centriole.
(ii) Nucleolus.
Date posted: February 6, 2018. Answers (1)
- In which form is carbon (IV) oxide transported in the body.(Solved)
In which form is carbon (IV) oxide transported in the body.
Date posted: February 6, 2018. Answers (1)
- State the functions of the following parts of a light microscope.
(a) Condenser.
(b) Diaphragm. (Solved)
State the functions of the following parts of a light microscope.
(a) Condenser.
(b) Diaphragm.
Date posted: February 6, 2018. Answers (1)
- What is the causative agent of cholera?(Solved)
What is the causative agent of cholera?
Date posted: February 6, 2018. Answers (1)
- Describe Amitosis as a type of cell division.(Solved)
Describe Amitosis as a type of cell division.
Date posted: February 2, 2018. Answers (1)
- Define the term Genomic imprinting.(Solved)
Define the term Genomic imprinting.
Date posted: February 2, 2018. Answers (1)