Question

What will happen it wall present or adsent in vein?

Answer 1

Explanation:

Blood in the veins is under much lower pressure when it returns from the different organs and tissues to the heart and hence has a chance of reverse flow if the valves are not there to avoid it.

Apart from preventing blood backflow, valves in the veins help to return blood from the extremities to the heart especially from the feet and legs.

Answer 2

Mitochondria may have a number of different shapes.[23] A mitochondrion contains outer and inner membranes composed of phospholipid bilayers and proteins.[17] The two membranes have different properties. Because of this double-membraned organization, there are five distinct parts to a mitochondrion:

the outer mitochondrial membrane,

the intermembrane space (the space between the outer and inner membranes),

the inner mitochondrial membrane,

the cristae space (formed by infoldings of the inner membrane), and

the matrix (space within the inner membrane).

Mitochondria stripped of their outer membrane are called mitoplasts.

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