Quiz 4: Cardiac Changes

True or False: Females have a greater rate of muscle loss than males.

• True

• False

Which states are have been associated with age? (Select all that apply).

• decrease aerobic fitness

• increase maximal heart rate

• increase maximal stroke volume

• decrease maximal (A-V)O2

• increase maximal (A-V)O2

If your end-diastolic volume is 140mL and your end-systolic volume is 50mL, what is your stroke volume?

• 190mL

• 1.6mL

• 90mL

• 80mL

What does not contribute to stroke volume?

• contractility

• afterload

• preload

• latentload

(a)   is the resistance that must be overcome by the left ventricle.

The QRS complex represents a phase of...

• atrial depolarization

• atrial hyperpolarization

• ventricular depolarization

• ventricular repolarization

What may happen to the QRS complex with age? (Select all that apply)

• increase amplitude

• decrease amplitude

• increase duration

• decrease duration

What causes prolonged QT interval because of a slower diastolic phase?

• Greater incidence of arrhythmias and fibrillation

• Fast and irregular beats

• Increase fat and collagen deposits

• Increase thickness of the valves

Which law states that the more the heart fills during diastole, the greater the force of contraction during systole?

• Bernoulli

• Starling

• Starlight

• Common-law

As preload increases, stroke volume ________.

• decreases

• increases

• does not change