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Heart
The heart is a major organ of the body that is found in the circulatory system. It pumps blood throughout the blood vessels. Questions related to the heart should be put here.
8,781 Questions
What is the advantages of having the left ventricle a thicker walls than the right ventricle?
The thicker walls of the left ventricle allow for greater pumping force. This increased force is needed because blood in the systemic circuit must travel much farther than that in the pulmonary circuit.
Where are all the good men dead in the heart or in the head?
The dead men never hurt the heart of the good in the head.
What bone is in front of the heart which is in the middle of your chest?
NO. Here's how to find your heart: with your finer, find the bottom of your sternum (the flat bone in the middle of your chest that's connected to your ribs). Move your finger about two inches to the left; this is where the bulk of your heart is. The top of your heart IS in the middle of your chest, but it tilts towards your left hip.
What is the main job of the heart?
The heart is located in the chest cavity. It is surrounded by a covering called the pericardium. The heart itself is divided into four chambers, called the right and left atria and the right and left ventricles.
The heart is connected to the rest of the body by means of VEINS which return to the lungs and the ARTERIES which pump blood to the body. The AORTA is the main artery coming out of the heart and receives blood under great pressure from it.
It is important to note is that the heart itself needs a constant supply of oxygen and nutrients to work (much as a car needs gas to run). This is supplied by the CORONARY ARTERIES which run on the surface of the heart. They come out of the root of the aorta.
There are two coronary arteries: RIGHT AND LEFT. The left is the larger one and is deviled into the LEFT ANTERIOR DESCENDING and the LEFT CIRCUMFLEX.
The left anterior descending (abbreviated LAD) supplies the major portion of the heart including the front wall and most of the middle septum in the heart. Blockage developing in this artery is serious because the resulting heart attack can be large and serious.
The left CIRCUMFLEX supplies the the side of the heart. The RIGHT CORONARY ARTERY supplies the lower part of the heart. In some people this artery is large and can supply the side of the heart as well. It can also be extremely small.
How the heart works:
The main function of the heart is to pump blood containing oxygen and nutrients to the body. The blood is first pumped to the lungs to pick up oxygen and then to the rest of the body. Blood flows inside the heart in an orderly fashion, first going to the right atrium, then to the right ventricle, then to the lungs and finally to the left atrium and left ventricle.
The heart beats almost like a clock, about 60 to 80 times per minute, CONTINUOUSLY, whether you are asleep or awake. The heartbeat is regulated by a small "battery" located in the right atrium called the SINUS NODE. Electric currents travel in the heart by means of minute fiber's in the wall of the heart, much like concealed wiring inside a room.
Do the arterioles send blood to the heart?
Arteries carry blood away from the heart while veins carry blood to the heart.
The vena cava (a vein) carries blood to the right atrium, and the pulmonic vein carries blood to the left atrium.
If you are talking about the coronary arteries that feed the muscle of the heart, they go to the myocardium.
How many heart chambers the alligator has?
Grasshoppers have an open circulatory system that contains a heart with 4 chambers. Unlike a human's 4 chambered heart, the grasshopper's heart pumps the blood to their head where it flows openly through their body.
Which areas of the heart are thinner or thicker?
The left ventricle (the lower chamber on the left side of your heart).
Can a person be born without vocal cords or a voicebox?
vocal cord differences in different genders include the following: size-women's smaller=higher pitch, men's bigger=lower pitch length-depends, male sizes=17mm-25mm, women sizes=12.5 mm-17.5mm tissue shape-can change sound!!!!! Yes. You can be born without vocal cords. It would be a birth defect.
What is the purpose of the heart?
Keeps your blood pumping round your body, and never takes a break from it.
Blood is good because it carries oxygen and chemicals around your body and delivers it to different parts.
Heart is really useful;]
The purpose of the heart is to pump blood around the different parts of the body.
To pump blood around the body via veins (into the heart) and arteries (out of the heart). The heart oxidises (fills it with oxygen) the blood. The blood's purpose is to deliver oxygen and warmth.
What is the significant name for heart muscle?
cardiac muscle. a type of cardiac muscle is the papillary muscles attach to the lower portion of the interior wall of the ventricles. They connect to the chordae tendineae, which attach to the tricuspid valve in the right ventricle and the mitral valve in the left ventricle. The contraction of the papillary muscles opens these valves. When the papillary muscles relax, the valves close.
Do you suffocate when your heart stops beating?
Breathing has both an automatic (involuntary) and a voluntary control. Of course, you don't have to voluntarily inhale and exhale consciously in order to stay alive; a part of the brain called the brainstem takes care of that. You can, of course control voluntarily the muscles you use for breathing (ie. the diaphragm and the intercostals), which is essential for speech, and many other activities.
The rhythm of the heart is not given by the brain. It comes from the heart's own pacemaker, a small node of special heart muscle called the sinus node or sinoatrial node. What the brain does is only the regulation of the heart rate. When you are relaxed, your heart beats slower, when excited, faster. But the heart is totally automatic: it keeps beating even after totally being separated from the nervous system (which is exactly the case in transplanted hearts).
Of course, the heart needs oxygen, and plenty of it. But, it can keep beating for quite a few minutes without breathing. This is what makes resuscitation possible sometimes even after more than 15 minutes of no breathing and heartbeat.
While the heart can keep beating for some time after the breathing stops, the reverse is practically not possible. Breathing is only possible with a functioning brainstem, and to keep the brainstem working, it needs blood full of oxygen. So, breathing usually stops seconds after the heart stops, and can be restarted only together with the heart during a cardiopulmonary resuscitation.
Is the left ventricle thicker than right ventricle because pumps blood against a greater resistance?
The left side of the heart is much bigger and stronger because it must pump blood through out to the entire body. The right side of the heart must only pump blood through the lungs (and then to the left side). So, since the blood is pumped in through and out of the left side with more pressure, the myocardium must be thicker.
What is it called when the damage to the valves of the heart caused by rheumatic fever?
Protein antibodies produced to defend the body against streptococcus bacteria
Do you turn a toilet valve right or left to loosen?
To loosen a toilet valve, you typically turn it to the left (counterclockwise). This direction follows the common rule that lefty-loosey, righty-tighty applies to most threaded fasteners. However, always check for any specific markings or instructions on the valve, as some may have unique designs.
How many chambers could be found in a dinosaur's heart?
There are four chambers in the human heart; two atriums and two ventricles.
Describe the size and location of the heart?
The Heart is roughly the shape and size of a person's clenched fist.
It's position can easily be seen in a mirror, by raising your arms above your head, draw an imaginary line across your nipples. Your heart is in the middle of that line, leaning towards the left.
This position corresponds to the position of the third button from the top, on a shirt or blouse.
How is the lub sound made in the heart?
The lubb sound happens when the ventricles relax and the AV valves close.
Why does you heart beat faster when you exercise?
The heart pumps blood through the body to provide nutrients and remove waste from the body's tissues, according to Gary Thibodeau and Kevin Patton in their book, "Structure and Function of the Body." The body requires more nutrients and produces more wastes as you exercise. Your body reacts to these and other changes by increasing the speed at which your heart beats.
Read more: http://www.livestrong.com/article/131922-why-does-your-heart-beat-fast-when-you-exercise/#ixzz1PABLI4LH
What are the structures involved in the conduction system of the heart?
Internal pacemaker , sinoatrial(sa) node, atrioventricular (av) node , atrioventricular bundle (bundle of his ) and purkinje fibres.
What is the first sound in the heartbeat?
The first sound of the heart is made by the bi- and tri- cuspid valves closing once the ventricles fill up with blood. The sounds themselves are not due to the sound of the valves actually closing, though it is caused by the rapid deceleration of blood hitting the closed valves (i.e. mitral valve closes - blood from LA filling LV hits the valve & heart walls, decelerating, resulting in reverberation of the heart walls, thus giving the S1). The second sound is made by the pulmonary and aortic semi-lunar valves via the same processes as S1.
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