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The normal heart sounds heard through a stethoscope are caused by the contractions of the ventricles?
Normal heart sounds (often called lub-dub) are caused by the pressure changes in the ventricles closing the various heart valves. The first sound, lub, is caused by the closing of the atrioventricular valves after the ventricles have filled with blood and as the ventricles begin to contract. The second sound, dub, is caused by the closing of the semilunar valves as the ventricles relax after pushing blood forward.
What else can I help you with?
What two heart sounds do you hear when listening with a stethoscope and what specific event is happening to cause each sound?
The lub-DUB of the heartbeat is caused by the closing of two separate pairs of valves, in response to heart muscle contractions. Turbulent blood flow occurs as blood pushes against the valves. The first sound is caused by the closing of atrioventricular valves (mitral valve, tricuspid valve) that separate the upper chambers (atria) and lower chambers (ventricles) of the heart, as blood enters the ventricles. The second sound is caused by the closing of the semilunar valves at the exit of the ventricles (the right ventricle having pumped blood into the pulmonary artery and the left ventricle having pumped blood into the aorta). There are other specific heart sounds that occur, usually as a result of problems with the function of the heart.
The crackle sound that is heard through a stethoscope when air bubbles through liquid in the lungs is called?
Atelectasis. It is caused from various pathologies and or from prolonged static positions.
What causes the sounds that are normally heard when listening to the heart through a stethoscope?
The sound is caused by the closing of valves in the heart.
What caused by rhythmic contractions of the heart?
The pulse is caused by the rhythmic contractions of the heart. The pulse can be measured at superficial arteries in teh body.
What is the movement of food in the oesophagus?
Peristalsis is the movement of food through the alimentary canal, caused by rhythmic contractions of the muscles therein.
What are heart beats caused by?
The 'lub' is caused from turbulence of the blood in the ventricles once they have contacted. The 'dub' is the backflow of blood against the semi-lunar valves in the pulmonary artery and aorta once it has been squeezed out by the ventricles.
Why does a girl get period pain?
It is caused by contractions in the womb/uterus
What causes shaking before a fever?
It is caused by involuntary muscle contractions.
What are afterpains?
Afterpains is the pain caused by uterine contractions experienced after childbirth.
The alternative expansion and contraction of the artery walls caused by the contraction and relaxation of the ventricles?
Pulse
What measures caused by ventricles contracting and pushing blood out of the heart?
The beats that you feel of your pulse.
A deficiency of parathyroid hormone can cause involuntary muscle contractions of a type called?
Tetany is the term for the muscle contractions that may be caused by hypoparathyroidism.
