BIO 219: LAB 16.2 - Movement of Blood Pressure

used to measure arterial blood
• consists of an inflatable cuff connected to a pressure gauge

force exerted by blood on the walls of the blood vessels
• expressed in millimeters of mercury (mm Hg)
• must be regulated to meet requirements for blood flow to the body organs.
• driving force for blood flow

sequence of sounds produced as the cuff pressure is decreased from systolic to diastolic pressure
• divided into 5 phases:
1. brief loud tapping
2. longer, softer murmurs
3. loud thumping sounds
4. soft muffled sounds
5. silence

the average blood pressure in the aorta and large arteries.
• The MAP is related to the cardiac output (CO) and total peripheral resistance (TPR) according to the formula:
MAP = CO x TRP

the difference between the systolic and diastolic pressure (systolic P - diastolic P)

pressure exerted on the arterial walls during ventricular contraction

lowest level of arterial pressure during a ventricular cycle

Systolic Pressure under 120
Diastolic Pressure under 80

chronically elevated arterial blood pressure, the heart works harder to pump blood around the body

Diastolic Pressure + (Pulse Pressure/3)

Subject must sit on the table with their left or right arm resting on the table at the same level with their heart. Put the cuff of the sphygmomanometer around the arm just above the elbow. Palpate the pulse in the brachial artery and close the screw valve. Inflate the cuff while listening to the brachial artery. Inflate the cuff about 20mmHg above the point where the pulse disappears. Place the diaphragm of the stethoscope over the brachial artery open screw valve slightly to slowly release pressure rate of 3 mmHg per second. Watch the pressure gauge while listening to the artery. Record systolic pressure as the point where you hear the 1st Korotkoff sound. Diastolic pressure is the point where the sound disappears.