y1 cvs set 1

A 61-year-old man presents with severe chest pain and a rhythmic pulsation over the left MCL 5th

intercostal space. Which of the portion of the heart is most likely responsible for the pulsation?

• Mitral valve

• Apex of heart

• Aortic arch

• Pulmonary valve

Answer explanation

-superior

-left

-apex

-inferior

-right

Cardiomyopathy results in the enlargement of the left atrium. Which of the following structure is

most likely to be compressed by this expansion?

• Azygos vein

• Oesophagus

• Left pulmonary artery

• Superior vena cava

A 68-year-old man is scheduled to have coronary bypass surgery to the posterior descending artery.

As this procedure is performed, which of the following vessels are most at risk of injury

• Anterior cardiac vein

• Great cardiac vein

• Middle cardiac vein

• Small cardiac vein

Answer explanation

right: ACV,SMV

left: great cardiac vein, coronary sinus

A boy is diagnosed with decreased blood flow into proximal descending thoracic aorta. His brachial

arterial pressure is high while femoral pressure is low. Which of the following embryonic structures

has fail to develop?

• 4th aortic arch

• 2nd aortic arch

• 6th aortic arch

An old man with typical coronary circulation has been suffering from an embolism of the circumflex

of LCA. This condition would result in ischemia of which of the following area of heart

• Posterior of LV

• Posterior of IV

• Anterior of LV

• Anterior of IV

Which of the following phases of cardiac action potential has the highest potassium permeability?

• Phase 0

• Phase 1

• Phase 2

• Phase 3

Answer explanation

p0: depolarization

p1: early repolarization

p2: plateau

p3: repolarization

p4: resting

Sympathetic stimulation of the heart does which of the following?

• Releases acetylcholine at the sympathetic endings

• Decreases sinus nodal discharge rate

• Decreases excitability of the heart

• Decreases cardiac contractility

Answer explanation

lebih senang nak pump jantung, heart rate increase

When recording lead avl on an ECG, which is the positive electrode?

• Left arm

• Left leg

• Right arm + left leg

• right arm

Answer explanation

aVR: right arm

aVF: ingat foot, left foot

aVL: left arm