PBS 4.2 The Heart at Work

What does the QRS wave on an EKG show?

• The atria are contracting

• The ventricles are contracting

• The ventricles are relaxing

• The heart is at rest

What does the T wave of an EKG shows?

• ventricular diastole

• atrial systole

• ventricular systole

• atrial diastole

Which of the following is known as the pacemaker of the heart?

• SA node

• AV node

• purkinje fibers

• bundle of His

Blood pressure is the force of blood pushed against?

• Brain

• Artery wall

• Lung

• None of the above

Pressure in the arteries measured with the ventricles are contracting is called?

• Systolic pressure

• diastolic pressure

• high blood pressure

• low blood pressure

Pressure in the arteries measured when the ventricles are relaxing is called?

• systolic pressure

• diastolic pressure

• defibrillation

• arrhythmia

On the diagram where is the atria contraction?

• 1

• 2 4 5

• 3

• 2 4 5 9

On the diagram where is the QRS complex, where the ventricles contract?

• 1

• 2 4 5

• 2 4 5 9

• 3

On the diagram where is the wave that indicates ventricular diastole (relaxation of the ventricles)?

• 1

• 2 4 5

• 3

• 9

Structure in the septum that carries the impulses to the ventricles.

• SA node

• AV bundle (Bundle of His)

• AV node

• perkinje fibers