|
The structure of which of the following consists of a layer of single cell thickness? |
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|
a) |
Blood capillary |
b) |
Artery |
c) |
Venule |
d) |
Arteriole |
|
The structure of which of the following consists of a layer of single cell thickness? |
|||||||
|
a) |
Blood capillary |
b) |
Artery |
c) |
Venule |
d) |
Arteriole |
(d)
Pulmonary artery differs from pulmonary vein in having thick muscular wall. The veins have internal semilunar valve to prevent backflow of blood.