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BLOOD VESSELS -
1. Tunica Externa - Made up of connective tissue, collagen fibres present.
2. Tunica media - Thick, made up of smooth muscles arranged in circular way.
3. Tunica interna - Inner most layer. Outerly made up of yellow elastin fibre. Inner layer is of endothelial cells.
S.NO.
ARTERY
VEIN
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Carry blood away from heart
Pure blood flows
(in pulmonary artery impure blood flows)
Blood flows with jerk
Blood flows with more pressure
Walls are thick
Lumen is narrow
Not collapse after death
Deeply placed
Valve absent
Wall firm
Towards heart
Impure blood flows
(In pulmonary vein pure blood flows)
Steady
Less pressure
Thin
Broad
Collapse
Superficially placed
Present to check back flow
Elastic
BACK CROSS When F 1 individual (Tt) is crossed with one of the two parents, either tall (TT) or dwarf (tt), such a cross is called the back cross. There are two possibilities
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