(D) $Cyanosis$ is the bluish discoloration of the skin and mucous membranes.It occurs due to the presence of a high concentration of deoxygenated haem

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Skin turning blue due to excessive amount of deoxygenated haemoglobin in the skin blood vessels

(D) $Cyanosis$ is the bluish discoloration of the skin and mucous membranes.It occurs due to the presence of a high concentration of deoxygenated haemoglobin in the cutaneous blood vessels.This condition is often a clinical sign of hypoxemia or poor circulation.

Class 11 Biology Breathing and Exchange of Gases Disorders of respiration system

Easy

Cyanosis is:

A
Lack of oxygen in body fluids
B
Difficult or heavy breathing
C
Excess of carbon dioxide in the body fluids
D
Skin turning blue due to excessive amount of deoxygenated haemoglobin in the skin blood vessels