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What else can I help you with?
When do the ventricles contract?
After the blood pumps from the atria to the ventricles, during systole.Systole
What makes the valves between atriums open and close?
There are no valves between the atria. The valves between the atria and ventricles close when the ventricles contract.
Do atrioventricular vales prevent backflow into the heart?
yes, they get it back by pumping blood to the 4 parts of your heart. when you inhale, it makes rich blood when you exhale it takes out poor blood which turns into carbon dioxide.
How does a normal heartbeat sound?
makes two sounds, "lubb" when the valves between the atria and ventricles close, and "dupp" when the valves between the ventricles and the major arteries close
What is the Difference between the papillary muscle and the pectinate muscle?
The pectinate muscles are shaped a bit like brush bristles, and their function is to allow maxium contraction of the atria using the minimal muscle mass. Papillary muscles are connected to strong tendons in the ventricles called the chordae tendinae, which gives them a lot of strength. Their purpose is to prevent prolapse of the valves in the ventricles after the ventricles contract. Prolapse means that the valves fall inward, allowing backflow of blood back into the ventricles after they have contracted, which makes for a far less efficient action of the ventricles. Prolapsed valves and the blackflow of blood caused by the valves folding onto themselves is called a "heart murmur".
What is the sound of your heart beating?
The atria and ventricles work together, alternately contracting and relaxing to pump blood through your heart. The electrical system of your heart is the power source that makes this possible. Your heartbeat is triggered by electrical impulses that travel down a special pathway through the heart.
What type of tissue makes up nonconducting skeleton of the heart?
Muscular
What makes ventricles contract?
Purkinje Fibers actually makes the ventricles contract.
What makes the heart sound you hear with a stethoscope?
The contractions of the heart muscle working against the heart valves make the "lub-DUB" sound that we hear as heartbeats. The sounds are made by the closing of : 1) the atrioventricular (AV) valves that separate the atria and ventricles of the heart The tricuspid valve is closing the entrance from the right atrium to the right ventricle, and the mitral valve is closing the entrance from the left atrium to the left ventricle. 2) the semilunar valves that control the exits from the ventricles The right ventricle is pumping blood into the pulmonary artery through the pulmonary valve, and the left ventricle is pumping blood into the aorta through the aortic valve. The two heart sounds therefore mark the entrance (lub) and exit (DUB) of blood from the ventricles.
What are the roles of the sino atrial nodes?
the sinoatrial (SA) node is the "pacemaker" of the heart-it is the first stucture that makes up the conduction system of the heart-the system of electrical impulses that are discharged throughout the heart and cause rhythmic cardiac contractions and relaxations. impulse conduction starts in the SA node, causing the atria to contract, then goes to the atrioventricular (AV) node, the bundle of His, and then to the pukinje fibers which cause the ventricles to contract.
What makes the semi lunar valves stay shut when the atria contracts?
The semi-lunar valves, located at the entrance of the aorta and pulmonary artery, remain shut when the atria contract due to the pressure dynamics in the heart. During atrial contraction, blood is pushed into the ventricles, causing ventricular pressure to remain lower than the pressure in the arteries. As a result, the blood in the aorta and pulmonary artery exerts pressure on the semi-lunar valves, preventing them from opening. This ensures that blood flows in the correct direction and that the ventricles fill properly before they contract.
What tissue type makes up the heart?
Cardiac muscles
