Exploring Cardiac Output and Its Impact on the Body

What is the definition of cardiac output?

• Volume of blood pumped by each ventricle in one hour

• Volume of blood pumped by each ventricle in one minute

• Volume of blood pumped by the heart in one minute

• Volume of blood pumped by the heart in one hour

Tags

NGSS.HS-LS1-3

What directly affects cardiac output?

• Heart rate and blood pressure

• Heart rate and ventricular volume

• Blood pressure and stroke volume

• Heart rate and stroke volume

What is the average heart rate for an adult at rest?

• 65 beats per minute

• 80 beats per minute

• 75 beats per minute

• 70 beats per minute

What is the average stroke volume for an adult at rest?

• 70 ml per beat

• 65 ml per beat

• 75 ml per beat

• 80 ml per beat

What factor is key in regulating stroke volume?

• Amount of blood in the atria

• Speed of heart contractions

• Amount of stretching in ventricular cardiac muscle

• Blood pressure levels

What effect does epinephrine have on heart rate?

• Decreases it slightly

• Increases it significantly

• No effect

• Decreases it significantly

Tags

NGSS.HS-LS1-3

What effect does acetylcholine have on heart rate?

• Increases it slightly

• Increases it significantly

• Decreases it significantly

• No effect

How does sympathetic nerve activity affect heart rate?

• Varies depending on the person

• No effect

• Increases it

• Decreases it

Tags

NGSS.HS-LS1-3

What increases stroke volume?

• Decreased heart rate

• Lower venous return

• Higher arterial pressure

• Greater stretching of cardiac muscle cells

What is the formula for calculating cardiac output?

• Heart rate / stroke volume

• Heart rate + stroke volume

• Heart rate x stroke volume

• Heart rate - stroke volume