Lab 7 - Blood Vessels and BP

When Measuring BP, Which of the Two Methods Tested Was More Accurate for Determining Systolic BP and Why?

Auscultation method (microphone) is more accurate because it detects the first Korotkoff sounds from turbulent flow

Describe the Differences in the Type of Blood Flow at the brachial Artery that Allow for the Determination of BP

no bloof flow: when cuff pressure > systolic presure

turbulent flow: between systolic and diastolic

laminar flow: when cuff pressure < diastolic pressure → no sound

What Happens to HR During “Pre-immersion” or “Immersion”. What Causes This?

HR breifly increases due to initial sympathetic stress response or anticipation of cold water

As Time Immersed Progressed, What Happened to HR? How Might These Changes be Beneficial?

HR decreased (bradycardia) due to dive reflex

this helps conserve oxygen by reducing the workload of the heart

As Time Immersed Progressed, What Happened to Pulse Amplitude? What Function Does this Change Serve?

pulse amplitude typically decreases due to peripheral vasoconstriction

• helps redirect blood flow to vital organs

What is the Overall Goal of all the Changes Observed During Drive Reflex

to converse oxygen and maintain blood flow the brain and heart