Which term defines the amount of blood pumped out by either ventricle per minute?

Which term defines the amount of blood pumped out by either ventricle per minute?

• A. Aldosterone
• B. Delta Wave
• C. Spina Bifida
• D. Cardiac Output

Answer: (D)

Cardiac output is the amount of blood pumped by a ventricle per minute. It reflects how effectively the heart delivers blood to the body's tissues and is determined by the heart rate and the amount of blood ejected with each beat (stroke volume). In formula terms, CO = heart rate × stroke volume. For a typical resting adult, this is about 5 liters per minute, though it can rise dramatically with exercise as both heart rate and stroke volume increase. Understanding what affects this helps: preload is the venous return filling the heart; increasing preload generally increases stroke volume via the Frank-Starling mechanism. Afterload is the pressure the heart must work against to eject blood; higher afterload can reduce stroke volume, lowering CO. Contractility refers to the heart muscle’s ability to contract; stronger contractility raises stroke volume and CO. The term described here specifically refers to the volume the ventricle pumps per minute, not other physiological concepts. Aldosterone is a hormone that helps regulate fluid balance, not the amount pumped per minute. Delta waves are EEG patterns associated with certain brain activity, and spina bifida is a congenital spinal defect; neither directly defines cardiac output.

Cardiac output is the amount of blood pumped by a ventricle per minute. It reflects how effectively the heart delivers blood to the body's tissues and is determined by the heart rate and the amount of blood ejected with each beat (stroke volume). In formula terms, CO = heart rate × stroke volume. For a typical resting adult, this is about 5 liters per minute, though it can rise dramatically with exercise as both heart rate and stroke volume increase.

Understanding what affects this helps: preload is the venous return filling the heart; increasing preload generally increases stroke volume via the Frank-Starling mechanism. Afterload is the pressure the heart must work against to eject blood; higher afterload can reduce stroke volume, lowering CO. Contractility refers to the heart muscle’s ability to contract; stronger contractility raises stroke volume and CO.

The term described here specifically refers to the volume the ventricle pumps per minute, not other physiological concepts. Aldosterone is a hormone that helps regulate fluid balance, not the amount pumped per minute. Delta waves are EEG patterns associated with certain brain activity, and spina bifida is a congenital spinal defect; neither directly defines cardiac output.