HBS 312: Blood Pressure, Stroke Volume, Cardiac Output video

What makes the heart's ventricles more significant than the atria in terms of blood pressure generation?

• Ventricles are larger in size

• Ventricles contract more forcefully to pump blood to the body

• Ventricles receive blood directly from the lungs

• Ventricles beat more frequently than atria

1. Which physiological relationship best explains why blood pressure is measured using two numbers?

• The two numbers represent left and right ventricle pressures

• One measures arterial pressure while the other measures venous pressure

• They represent pressure during the contraction and relaxation phases

• The numbers show pressure in the upper vs lower body

What is the most accurate explanation for the sounds heard during a heartbeat?

•  Blood rushing through the arteries

• The ventricles contracting

•  The atria filling with blood

• Heart valves closing

If a patient's blood pressure reading is 140/90 mm Hg, what is the most likely interpretation?

• The patient has lower than normal blood pressure

• The patient has slightly elevated blood pressure

• The patient's blood pressure is exactly normal

• The reading indicates a measurement error

Time to do some math. (Use your calculator on your Chromebook!)

If a person's stroke volume is 80 mL and their heart rate is 65 beats per minute, what would their cardiac output be?

• 5.2 L/min

• 4.8 L/min

• 5.8 L/min

• 4.2 L/min

Which of these scenarios would most likely result in increased cardiac output?

• Sleeping

• Running a marathon

• Sitting in a chair

• Standing Still

Why does increasing physical activity lead to increased cardiac output?

• The heart grows larger during exercise

• Blood becomes thinner and flows more easily

• HIgher heart rate pumps more blood per minute to meet oxygen demands.

• The stroke volume doubles during physical activity.

A patient's cardiac output suddenly increases from 5.0 L/min to 7.5 L/min. Which combination of changes could explain this?

• Decreased stroke volume and increased heart rate

• Increased stroke volume but decreased heart rate

• Increased stroke volume and increased heart rate

• No change in stroke volume but doubled heart rate.