Question: Conduction velocity is least in_______________?

• 1. AV node
• 2. SA node
• 3. SA node
• 4. Purkinje fibers

Question: Absolute refractory period in heart______________?

• 1. Lasts till cardiac contraction
• 2. Longer than refractory period in skeletal muscle
• 3. A phase of cardiac cycle in which heart cannot be stimulated by any amount of stimulus
• 4. All of the above

Question: Increased functional demand on the heart produces increased size of the myocardium by _______________?

• 1. Hyperplasia
• 2. Hypertrophy
• 3. Fatty infiltration
• 4. Increased amounts of fibrous connective tissue

Question: Peripheral resistance is maximum in_______________?

• 1. Aorta
• 2. Artery
• 3. Arteriole
• 4. Vein

Question: Starling’s law of the heard________________?

• 1. Does not operate in the failing heart
• 2. Does not operate during exercise
• 3. Explains the increase in cardiac output that occurs when venous return is increased
• 4. Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated

Question: All the heart valves are open during which stage of cardiac cycle __________________?

• 1. Systolic ejection
• 2. Isovolumetric relaxation
• 3. Isovolumetric contraction
• 4. None of the above

Question: Cardiac output is not affected by __________________?

• 1. Heart rate
• 2. Peripheral resistance
• 3. Systolic blood pressure
• 4. Venous return

Question: Stroke output of each ventricle in normal adult is_____________?

• 1. 30 ml
• 2. 130 ml
• 3. 70 ml
• 4. 5 liters

Question: Normally, the rate of the heart beat in a human is determined by _________________?

• 1. The bundle of His
• 2. All cardiac muscle
• 3. The sinoatrial node
• 4. The cervical ganglion

Question: The first heart sound is produced by the_____________?

• 1. Closure of the aortic and pulmonary valves
• 2. Opening of the aortic and pulmonary valves
• 3. Closure of the mitral and tricuspid valves
• 4. Opening of the mitral and tricuspid valves