Conduction in Heart

Q.

Define the following terms and give their location?

(i) Purkinje fibre

(ii) Bundle of His

Q.

‘Bundle of His’ is a part of which one of the following organs in human?

1. Brain

2. Kidney

3. Heart

4. Pancreas

Q. Which of the following diagram is/are wrong representation of cardiac cycle?

1. $1$ and $2$
2. $2$ and $3$
3. $3$ and $4$
4. $1$ and $4$

Q.

By counting the number of _________________ that occurs in a given time period, one can determine the heart rate of an individual

1. QRS complex

2. ST interval

3. P- wave

4. T – wave

Q.

The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is
$\begin{array}{ccccc}\left(a\right)& SANode& AVNode& Purkinjefiber& AVBundle\\ \left(b\right)& SANode& Purkinjefiber& AVNode& AVBundle\\ \left(c\right)& SANode& AVNode& AVBundle& Purkinjefiber\\ \left(d\right)& SANode& Purkinjefiber& AVBundle& AVNode\end{array}$

Q.

What is the significance of the atrio-ventricular node and atrio-ventricular bundle in the functioning of heart?

Q. During contraction of skeletal muscle $C{a}^{2+}$ bind to:

1. Actin
2. Troponin
3. Tropomyosin
4. Myosin ATPase

Q.

In a human foetus the limbs and digits develop after

1. First trimester

2. 8 weeks

3. 12 weeks

4. $5^{th}$ month

Q. Match the following and choose the correct options.

$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{A. Trophoblast}& \text{1. Embedding of blastocyst in the endometrium}\\ \text{B. Cleavage}& \text{2. Group of cells that would differentiate as embryo}\\ \text{C. Inner cell mass}& \text{3. Outer layer of blastocyst attached to the endometrium}\\ \text{D. Implantation}& \text{4. Mitotic division of zygote}\end{array}$

1. $\begin{array}{cccc}A-2& B-1& C-3& D-4\end{array}$
2. $\begin{array}{cccc}A-3& B-4& C-2& D-1\end{array}$
3. $\begin{array}{cccc}A-2& B-4& C-3& D-1\end{array}$
4. $\begin{array}{cccc}A-3& B-1& C-2& D-4\end{array}$

Q.

What is the significance of time gap in the passage of action potential from sino-atrial node to the ventricle?

Q.

Read the following statements and choose the correct option.
Statement I Atria receive blood from all parts of the body which subsequently flows to ventricles.
Statement II Action potential generated at sino-atrial node passes from atria to ventricles.
(a) Action mentioned in statement I is dependent on action mentioned in Statement II
(b) Action mentioned in statement II is dependent on action mentioned in Statement I
(c) Action mentioned in statement I and II are independent of each other
(d) Action mentioned in statement I and II are synchronous.

Q.

Does an embryo have a heartbeat?

Q. To which of the following, Bundle of His passes stimulus of contraction?

1. AV-node
2. SA-node
3. Purkinje fibre
4. Atrium

Q. What happens when the pacemaker is non functional?

1. Only the auricles will contract rhythmically
2. The cardiac muscles do not contract in a coordinated manner rhythmically.
3. Only ventricles contract rhythmically.
4. Cardiac muscles will contract in a coordinated manner.

Q.

Heart beats are accelerated by the

1. Cranial nerves

2. Stomach peristalsis

3. Number of RBCs

4. Sympathetic nerves

Q. Bundle of His

1. generates action potential which causes the atria to contract
2. conducts the action potential and helps in the contraction of ventricles
3. regulates the rhythm of heart rate
4. changes the duration of contraction between the atria and ventricles

Q. Repolarisation refers to

1. no change in the negative charge in the conduction cells of the heart
2. decrease in the negative charge in the conduction cells of the heart
3. increase in the negative charge in the conduction cells of the heart
4. none of these

Q.

The conduction mechanism consists of three stages. Which of the following is the correct order of events during this process?

1. atrial depolarization → ventricular depolarization → atrial and ventricular repolarization

2. ventricular repolarization → atrial depolarization → atrial and ventricular repolarization

3. atrial and ventricular repolarization → ventricular depolarization → atrial depolarization

4. ventricular repolarization→ atrial depolarization→ atrial and ventricular depolarization

Q. Describe the conducting system of the human heart.

Q.

Where do the bundle branches originate from?

Q. Given below is the ECG of a normal human. Which one of its components is correctly interpreted below?

1. Peak P- Initiation of left atrial contraction only
2. Peak P and peak R together - Systolic and diastolic blood pressures
3. Peak T - Initiation of total cardiac contraction
4. Complex QRS - One complete pulse

Q.

Electrical conduction of the heart's cells is also known as?

1. Defibrillation

2. Repolarisation

3. Polarisation

4. Depolarisation

Q.

Which is the pumping organ of your body?

Q. WHAT IS THE FUNCTION OF INTERCALATED DISC IN CARDIAC MUSCLES?

Q. Given below is the ECG of a normal human. Which one of its components is correctly interpreted below?

1. Peak T - Initiation of total cardiac contraction
2. Complex QRS - One complete pulse
3. Peak P and peak R together - Systolic and diastolic blood pressures
4. Peak P- Initiation of left atrial contraction only

Q. Bundle of His

1. generates action potential which causes the atria to contract
2. conducts the action potential and helps in the contraction of ventricles
3. regulates the rhythm of heart rate
4. changes the duration of contraction between the atria and ventricles

Q. When does the blood enter in Atria. Choose the correct:-
(a) During generation of impulse from SAN
(b) Atrial relaxation
(c) As the tricuspid and bicuspid valves are open
(d)Joint diastole

1. a, b
2. a, b, c
3. b, c, d
4. all

Q. Choose the type of nervous system and type of muscle supplying visceral organs

1. Sympathetic nervous system, voluntary
2. Sympathetic nervous system, involuntary
3. Parasympathetic nervous system, involuntary
4. Both sympathetic and parasympathetic nervous systems, involuntary

Q.

Identify the labelled parts of heart’s conduction system as depicted in the image.

1. (i)SA node, (ii) Purkinjefibres, (iii) AV node, (iv) Bundle of His

2. (i)Bundle of His, (ii) Purkinjefibres, (iii) AV node, (iv) SA node

3. (i)Purkinjefibres, (ii)Bundle of His, (iii) SA node, (iv) AV node

4. (i)SA node, (ii) AV node, (iii) Bundle of His, (iv) Purkinje fibres

Q. During the rhythmicity of heart beat, the impulse of cardiac begins at _________.

1. A.V. Node
2. S.A. Node
3. Purkinje fibres
4. Bundle of His