MTA certification addresses a wide spectrum of fundamental technical concepts, assesses and validates your core technical knowledge, and enhances your technical credibility. Note MTA exams do not qualify for MCP certification, nor are they a prerequisite for MCSA or MCSD certification.
The bottom number is the more important of the two. The bottom number of your BP (104) is a bit high. That's the pressure in your blood vessels after your heart has contracted and is now at momentary rest. Average is about 80. Your upper number (128) corresponds to the pressure in your vessels when your heart contracts.
Either a sphygmomanometer or a special machine is used to measure blood pressure. During this procedure, two numbers are recorded -- one appearing over the other as a fraction. The top number represents pressure when your heart is beating; the bottom number measures pressure when your heart is resting. The unit used when taking a blood pressure reading is millimeters of mercury (mmHg).