Heart

Assertion: Angina pectoris means "pain in the chest".

Reason: It results due to carrying of extra blood to the heart muscle.

• Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

• Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

• Assertion is correct but Reason is incorrect.

• Both Assertion and Reason are incorrect.

Read the statements and choose the correct option:

S1: Cardiac output would increase through either an increase in heart rate or a rise in stroke volume.

S2:Reptiles have three chambered heart, mammals have two chambered and fishes have only two chambered heart.

S3:The walls of auricles are comparatively thicker than ventricles.

• S1 & S3 are correct

• only S3 is correct

• S2 & S3 are correct

• only S1 is correct

Match the columns and choose the correct option.

(i)Stroke volume (a)70-75 action potential per minute

(ii)Cardiac output (b)Ventricular repolarisation

(iii)SAN (c)70 ml of blood per cardiac cycle

(iv)P-wave (d)5000 ml of blood per cardiac cycle

(v)T-wave (e)Atrial depolarisation

• i-d, ii-c, iii-a, iv-b, v-e

• i-a, ii-e, iii-c, iv-d, v-b

• i-c, ii-d, iii-a, iv-e, v-b

• i-c, ii-a, iii-d, iv-e, v-b

Read the statements and choose incorrect one:

• The valves in the heart allows the flow of blood only in one direction, i.e., from the atria to the ventricles and from the ventricles to the pulmonary artery or aorta.

• The atrium and the ventricle of the same side are also separated by a thick fibrous tissue called the atrio-ventricular septum.

• AV bundle continues from the AVN which passes through the atrio-ventricular septa to emerge on the left of the inter-ventricular septum and immediately divides into a right and left bundle.

• This sequential event in the heart which is cyclically repeated is called the cardiac cycle a

Statement 1: AV node delays the impulses to heart apex approx for about 0.1 sec as it allowed the atria to empty completely.

Statement 2: Portal system is one in which a vein starts from an organ and ends up in another organ by dividing into capillaries.

• Both statement 1 and 2 are correct

• Both statement 1 and 2 are incorrect

• Only statement one is correct

• Only statement two is correct

Calculate the cardiac output of person, if his heart rate is 70 beats per min, blood volume in the ventricles at the end of the diastole is 150ml, and at the end of the systole blood in ventricles is 60ml.

• 63000L

• 5000 L

• 6300 L

• 5500 L

All of the following observations can be seen in a person doing exercise except:

• Increase in heart rate

• Increase in cardiac output

• increase in duration of cardiac cycle

• increase in blood flow to skeletal muscles

Assertion: SA node is called the pacemaker of the heart.

Reason: AVN is responsible for initiating and maintaining the rhythmic contractile activity of heart.

• Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

• Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

• Assertion is correct but Reason is incorrect

• Assertion is incorrect but Reason is correct

Read the statements and find the incorrect one:

• The ECGs obtained from different individuals have roughly the same shape for a given lead configuration, any deviation from this shape indicates a possible abnormality or disease.

• The deoxygenated blood pumped into the pulmonary artery is passed on to the lungs from where the oxygenated blood is carried by the pulmonary veins into the left atrium.

• Systemic heart refers to the right atrium and left ventricle.

• Pulmonary heart refers to the Right atrium and Right ventricle.

Which of the following is incorrect about the ECG:

• The machine (electro-cardiogram) is used to obtain an electrocardiograph

  (ECG).

• To obtain a standard ECG a patient is connected to the machine with three electrical leads that continuously monitor the heart activity.

• By counting the number of QRS complexes that occur in a given time period, one can determine the heart beat rate of an individual.

• The T-wave represents the return of the ventricles from excited to normal state.