Study notes on “Human Heart” For Govt. Exam 2019

General Science is an equally important section in SSC CGLCHSL, MTS, RRB NTPC exams and has even more abundant importance in some other exams conducted by SSC.  To let you make the most of the General Science section, we are providing notes on “Human Heart ”. Also, General Science is a major part to be asked for various posts exams. We have covered important notes focusing on these prestigious examsWe wish you all the best of luck to come over the fear of General Awareness section.
HUMAN HEART
The human heart is an organ that pumps blood throughout the body via the circulatory system, supplying oxygen and nutrients to the tissues and removing carbon dioxide and other wastes.
 The human heart has four chambers: 
  • The right atrium and right ventricle together make up the “right heart,”  
  • the left atrium and left ventricle make up the “left heart.” 
  • A wall of muscle called the septum separates the two sides of the heart.
  • Valves prevent backflow, keeping the blood flowing in one direction through the heart.
A double-walled sac called the pericardium encases the heart, which serves to protect the heart and anchor it inside the chest. 
Between the outer layer, the parietal pericardium, and the inner layer, the serous pericardium, runs pericardial fluid, which lubricates the heart during contractions and movements of the lungs and diaphragm.

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The heart’s outer wall consists of three layers:-
  • The outermost wall layer, or epicardium, is the inner wall of the pericardium.  
  • The middle layer, or myocardium, contains the muscle that contracts. 
  • The inner layer, or endocardium, is the lining that contacts the blood.
The sinoatrial node produces the electrical pulses that drive heart contractions.
 

HUMAN HEART FUNCTION

 
The heart circulates blood through two pathways: 
  1. The pulmonary circuit 
  2. The systemic circuit
In the pulmonary circuit, deoxygenated blood leaves the right ventricle of the heart via the pulmonary artery and travels to the lungs, then returns as oxygenated blood to the left atrium of the heart via the pulmonary vein.
 
In the systemic circuit, oxygenated blood leaves the body via the left ventricle to the aorta, and from there enters the arteries and capillaries where it supplies the body’s tissues with oxygen. Deoxygenated blood returns via veins to the vena cava, re-entering the heart’s right atrium.
The cardiovascular system circulates blood from the heart to the lungs and around the body via blood vessels.
 

Blockage of any artery can cause a heart attack, or damage to the muscle of the heart. A heart attack is distinct from cardiac arrest, which is a sudden loss of heart function that usually occurs as a result of electrical disturbances of the heart rhythm.

How the Heart Beats
How does the heart beat? Before each beat, your heart fills with blood. Then its muscle contracts to squirt the blood along. When the heart contracts, it squeezes — try squeezing your hand into a fist. That’s sort of like what your heart does so it can squirt out the blood. Your heart does this all day and all night, all the time. The heart is one hard worker!

 
The heart contains electrical “pacemaker” cells, which cause it to contract — producing a heartbeat.
 
A healthy heart contraction happens in five stages. 
1st stage: (early diastole), the heart is relaxed. 
2nd stage:Then the atrium contracts (atrial systole) to push blood into the ventricle. 
3rd stage: The ventricles start contracting without changing volume. 
4th stage: Then the ventricles continue contracting while empty. 
5th stage: Finally, the ventricles stop contracting and relax. 
Then the cycle repeats. 

Keep Your Heart Happy
Most kids are born with a healthy heart and it’s important to keep yours in good shape. Here are some things that you can do to help keep your heart happy:

Remember that your heart is a muscle. If you want it to be strong, you need to exercise it. How do you do it? By being active in a way that gets you huffing and puffing, like jumping rope, dancing, or playing basketball. Try to be active every day for at least 30 minutes! An hour would be even better for your heart! Eat a variety of healthy foods and avoid foods high in unhealthy fats, such as saturated fats and trans fats (reading food labels can help you figure out if your favorite snacks contain these unhealthy ingredients). Try to eat at least five servings of fruits and vegetables each day. Avoid sugary soft drinks and fruit drinks. Don’t smoke. It can damage the heart and blood vessels.

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