1AA3 Test 1

Action potentials are conducted _____ at the atrioventricular node compared to the sinoatrial node

• Slower

• Faster

• At the same speed

The ____ _____ conduct action potentials to ventricular muscle cells.

The ___ ____ (2 words) drains blood into the right atrium

The QT interval represents the start of ____ depolarization to the end of ____ repolarization

• ventricular; atrial

• atrial; atrial

• atrial; ventricular

• ventricular; ventricular

Repetitive relaxation of heart chamber is known as ______.

Diastolic pressure is reached at the end of _____

• active ventricular filling

• period of ejection

• period of isovolumetric relaxation

• period of isovolumetric contraction

End-diastolic volume is reached at the end of _____

• active ventricular filling

• period of isovolumetric contraction

• period of ejection

• period of isovolumetric relaxation

• passive ventricular filling

What prevents heart tissue from dying when a blockage occurs?

The "Lubb" sound is heard at the beginning of _____

• ventricular diastole

• atrial systole

• atrial diastole

• ventricular systole

What occurs during the depolarizing phase of the auto-rhythmic cells of the heart?

• K+ channels open

• Na+ channels open

• Ca2+ channels open

• A and C