RRB NTPC Science Notes & MCQs | Most Important Questions
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RRB NTPC Science Heart is a high-scoring topic for railway exams. Questions are simple and mostly factual, so clear basics can help students gain easy marks. Regular study of the heart structure, valves, and heartbeat is very useful.
The video class explains the human heart in an easy way, covering parts, working, the pacemaker, and common exam points. Watching and revising these concepts helps students remember facts and perform better in RRB NTPC exams.
RRB NTPC Science Heart
RRB NTPC Science Heart is an important topic of RRB NTPC Biology for students preparing for railway exams. Questions from the human heart are often asked in a simple and direct way. If you understand the basics clearly, you can score easy marks from this chapter.
Railway NTPC Science Heart Class
Below is a helpful video that teaches the RRB NTPC Science heart topic in simple language for competitive exam students. This class explains the human heart’s parts, valves, heartbeat, pacemaker, and more in a clear way that makes it easy to understand and remember for exams like RRB NTPC.
Watch the full lesson here:
What is the Human Heart?
The RRB NTPC Science heart topic starts with understanding what the human heart is. The human heart is a muscular organ present in our chest. It works like a pump. Its main job is to pump blood to all parts of the body.
The heart does not think or feel emotions. It only pumps blood day and night without stopping. This is why the heart is the most important part of the circulatory system.
Also Read: RRB NTPC Selection Process
Location and Size of the Heart
In RRB NTPC Science heart, students should know the basic location and size of the heart. The heart is located slightly towards the left side of the chest. Its size is almost equal to a closed fist of a person.
Before looking at the details, remember that size and weight are common exam questions.
|
Feature |
Details |
|
Location |
Slightly left side of chest |
|
Shape |
Cone-shaped |
|
Size |
Almost equal to a fist |
|
Weight |
Around 300–400 grams |
Structure of the Human Heart
The RRB NTPC Science heart chapter explains that the heart has four chambers. These chambers help in proper blood flow. Chambers are divided by a wall called septum.
|
Chamber |
Position |
Function |
|
Right Atrium |
Upper right |
Receives impure blood |
|
Right Ventricle |
Lower right |
Sends blood to lungs |
|
Left Atrium |
Upper left |
Receives pure blood |
|
Left Ventricle |
Lower left |
Sends blood to body |
Valves of the Heart
Valves are very important in RRB NTPC Science heart. Valves stop blood from flowing backward. The human heart has four valves.
|
Valve Name |
Also Called |
Location |
|
Tricuspid Valve |
Right valve |
Between right atrium and ventricle |
|
Bicuspid Valve |
Mitral valve |
Between left atrium and ventricle |
|
Pulmonary Valve |
Semilunar valve |
Between heart and lungs |
|
Aortic Valve |
Semilunar valve |
Between heart and aorta |
Check: RRB NTPC Syllabus
Working of the Heart (Heartbeat)
The RRB NTPC Science heart topic includes how the heart beats. The heartbeat sound is not “dhak dhak.” The correct sound is “lub dub.”
One heartbeat is made of two steps:
-
Systole – heart contracts
-
Diastole – heart relaxes
Together, these two actions create one heartbeat.
|
Term |
Meaning |
|
Systole |
Contraction of heart |
|
Diastole |
Relaxation of heart |
|
Normal heartbeat |
Around 72 per minute |
Blood Pumping Capacity
In RRB NTPC Science heart, students must remember that the heart pumps a large amount of blood. This shows how strong the heart is.
|
Time |
Blood Pumped |
|
1 minute |
About 5 liters |
|
1 day |
Thousands of liters |
Pacemaker and SA Node
The RRB NTPC Science heart chapter explains pacemaker clearly. The natural pacemaker of the heart is called the SA Node (Sinoatrial Node).
It produces electrical signals that control heartbeat. If it fails, doctors use an artificial pacemaker.
|
Type |
Description |
|
Natural pacemaker |
SA Node |
|
Artificial pacemaker |
Battery device |
|
Battery used |
Lithium |
Heart Rate Disorders
Heart rate problems are important for RRB NTPC Science heart questions. A normal heart rate is about 72 beats per minute.
|
Condition |
Meaning |
|
Bradycardia |
Heartbeat less than normal |
|
Tachycardia |
Heartbeat more than normal |
Blood Pressure and Instruments
In RRB NTPC Science heart, instruments are often asked in exams. Each instrument has a specific job.
|
Instrument |
Use |
|
ECG |
Measures heart activity |
|
Sphygmomanometer |
Measures blood pressure |
|
EEG |
Measures brain activity |
Heart Covering and Fluid
The heart is protected by a covering called Pericardium. This topic is part of RRB NTPC Science heart basics.
|
Part |
Description |
|
Pericardium |
Protective layer |
|
Layers |
Fibrous and serous |
|
Fluid |
Cardiac fluid |
Cholesterol and Heart Disease
Cholesterol buildup blocks arteries. In RRB NTPC Science heart, this condition is called atherosclerosis. It can lead to heart attack.
Healthy food and exercise help prevent heart problems.
Circulatory System
The heart is part of the circulatory system. Blood flows continuously in the body. This system carries oxygen and nutrients. This concept is often linked with circulatory system questions in RRB NTPC exams.
RRB NTPC Science Heart Important MCQs
Below are 10 important MCQs prepared directly from the video content. These questions are useful for RRB NTPC Science (Biology) and focus on the human heart, its structure, and functions.
Q1. How many valves are present in the human heart?
A. Two
B. Three
C. Four
D. Five
Correct Answer: C. Four
Q2. Which valve is present between the right atrium and right ventricle?
A. Bicuspid valve
B. Tricuspid valve
C. Aortic valve
D. Pulmonary valve
Correct Answer: B. Tricuspid valve
Q3. The valve connected to the pulmonary artery is called:
A. Mitral valve
B. Aortic valve
C. Tricuspid valve
D. Pulmonary (semilunar) valve
Correct Answer: D. Pulmonary (semilunar) valve
Q4. What is the normal sound of the human heart?
A. Tik–Tik
B. Dhak–Dhak
C. Lub–Dub
D. Tap–Tap
Correct Answer: C. Lub–Dub
Q5. One complete heartbeat takes approximately how much time?
A. 0.5 second
B. 0.8 second
C. 1 second
D. 2 seconds
Correct Answer: B. 0.8 second
Q6. The contraction phase of the heart is called:
A. Diastole
B. Relaxation
C. Systole
D. Expansion
Correct Answer: C. Systole
Q7. Which structure is known as the natural pacemaker of the heart?
A. AV node
B. SA node
C. Purkinje fibers
D. Ventricles
Correct Answer: B. SA node
Q8. The instrument used to record heart activity is:
A. EEG
B. Sphygmomanometer
C. ECG
D. Thermometer
Correct Answer: C. ECG
Q9. Heart rate lower than normal (below 72 beats/min) is called:
A. Tachycardia
B. Hypertension
C. Bradycardia
D. Hypotension
Correct Answer: C. Bradycardia
Q10. The membrane that surrounds the heart is called:
A. Pleura
B. Peritoneum
C. Pericardium
D. Endocardium
Correct Answer: C. Pericardium
Importance of RRB NTPC Science Heart for Exams
The Human Heart topic in RRB NTPC General Science is highly scoring and easy to prepare. Questions are usually direct, factual, and based on basic concepts such as structure, functions, blood circulation, and heart-related terminology.
With regular revision and consistent practice of human heart notes, candidates can answer these questions accurately and boost their overall score. Due to its predictable nature, this topic should not be skipped during preparation.
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