Cardiac Physiology

The amount of blood returned to the heart during diastole is referred to as preload

• True

• False

Which of these is a characteristic of cardiac myocytes?

• Voluntary contraction

• Non-striated

• Intercalated disks

• Multinucleate

During exercise, more blood is sent to the skeletal muscle than to the kidneys.

• True

• False

Tags

NGSS.HS-LS1-3

Diastolic function is a measure of the ability of the myocardium to______and allow adequate ventricular_____.

• Contact, Filling

• Relax, Filling

• Relax, Contact

• Contact, Emptying

Contractility is the same as contractile force.

• True

• False

What is the most important physiological factor that enhances cardiac contractility?

• Epinephrine

• Norepinephrine

• Growth hormones

• None of the above

Myofibrils are not composed of sacromeres

• True

• False

The three primary factors that determine the stroke volume are...

• Conractility, Afterload, Overload

• Preload, Afterload, Contractility

• Preload, Afterload, Overload

• Preload, Contractility, Overload

Degree of stretch and intracellular calcium affect the force of contraction

• True

• False

Cardiac myocyte contraction begins when calcium ions bind to ____ causing a configurational change.

• Tropomyosin

• Actin

• Troponin

• Myosin