Cardiac Output

Tachycardia is faster than _____ beats per minute

100

Newborn infants average heart rate

120 beats per minute

Bradycardia is slower than _____ beats per minute

60

Average Stroke volume

60-80ml/beat

Young adult males average heart rate

64-72 beats per minute

The heart ejects about ___ ml each time it beats (Stroke volume)

70

Young adult females average heart rate

72-80 beats per minute

Typical resting heart rate

75 beats per minute

Stroke volume is the amount of _________

Blood ejected by the heart with each beat

Formula for cardiac output

CO= HR X SV HR: Number of times the heart beats in 1 min SV: Amount of blood ejected by the heart with each beat

The only 2 ways to affect cardiac output:

Change the heart rate, change the stroke volume

When heart rate increases, stroke volume _____

Decreases (Because the faster the heart rate, the less time the ventricles have to fill)

Cardiac output measures the _________

Effectiveness of the heart

The stronger the contraction, the _____ the stroke volume

Greater

Cardiac output _____ with activity

Increases

Cardiac output refers to _________

The amount of blood the heart pumps in 1 minute

Cardiac output depends on ______ and ______

Venous return and strength of the contraction