Fill in the missing information by determining the amounts represented by letters a - d. 
Definitions:
Symptoms
Signs or indications of a disease or condition experienced by an individual.
REM Sleep
A unique phase of sleep characterized by rapid eye movement, low muscle tone, and the propensity to dream vividly.
Physiological Changes
Alterations in the body's normal biological functions, which can be due to various factors such as stress, exercise, or illness.
Blood Pressure
The force exerted by circulating blood on the walls of blood vessels, a critical indicator of cardiovascular health.
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