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.
You will see your blood pressure reading written like this: 120/80. The systolic blood pressure reading is the top number, and the diastolic blood pressure reading is on the bottom. Both values represent the pressure in millimeters of mercury, or mmHg. Both the systolic and diastolic numbers are important.