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The normal pattern of impulse conduction through the heart is?
Wiki User
∙ 13y ago
SA node, AV node, AV Bundle, Bundle branches, subedocardial branches (purkinje fibers)
Wiki User
∙ 13y ago
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What critical role does the nodal system play in heart physiology?
Normal impulse conduction
What characterizes the normal operation of the heart?
each part contracts in a specific order. Contraction of the muscle is triggered by an electrical impulse. These electrical impulses travel through specialized cells that form a conduction system. Following this pathway ensures that contractions will
What is responsible for initiating the heartbeat?
There is a group of cells in the heart called the "pacemaker" that sends out a nerve shock to initiate a heartbeat. It also changes the pulse depending on certain external conditions to maintain homeostasis. -Richard
What is a group of cells that adjusts the heart rate?
There are two groups or clusters of specialized cells that act as the "pacemaker" for the heart. They are modified cardiac myocytes, which is a type of muscle tissue but these don't contract like normal muscle tissue. The Sinoatrial (SA) Node, located at the apex of the right atrium; and the Atrioventricular (AV) Node, located at the base of the right atrium. The SA Node starts the "heart beat" by sending out an electrical impulse (or action potential) about 60-90 times per minute. The rate can be adjusted by your parasympathetic nervous system, like when you go to sleep; or by your sympathetic nervous system, like when you exercise. Other factors can also deregulate the rate of that action potential, things like: Fatigue, dehydration, alcohol, caffeine, and a number of other chemical imbalances (sodium, potassium, calcium, etc...) So this is just another reason why it's important to eat a well balanced diet, because you can cause your SA Node to go crazy! This impulse from the SA Node causes the left and the right atria to contract simultaneously, sending blood to the ventricles, it also travels along special conduction channels to the AV Node. The AV Node picks up the impulse from the SA Node where it first delays for about .10s allowing time for the atria to fully eject their blood into the ventricles. Then the AV Node amplifies the signal, for the larger ventricular muscles, and fires its electrical impulse down the His Bundle (specialized nerve/conduction pathways), through the Purkinje fibers (more special nerves) and finally to the ventricular myocardium causing the ventricles to contract. Then, God willing, the whole thing starts over again.
Are slow motion effects achieved when the film is run through the camera at a slower-than-normal rate and then projected at normal speed?
No. Slow motion is the result of recording images at a very fast rate and then playing them back at a normal rate.
What critical role does the nodal system play in heart physiology?
Normal impulse conduction
The nodal system plays a critical role in heart physiology What is that role?
Normal impulse conduction
What characterizes the normal operation of the heart?
each part contracts in a specific order. Contraction of the muscle is triggered by an electrical impulse. These electrical impulses travel through specialized cells that form a conduction system. Following this pathway ensures that contractions will
Can someone help you decipher your EKG report It says sinus tachycardia borderline AV conduction delay and probable left atrial abnormality.?
sinus tachycardia = rapid heartbeat borderline av conduction delay = a slight delay in the conduction of electrical impulse from the atria, at the top of the heart, to the ventricles, at the base of the heart. The ventricles are the chambers that do the pumping of blood to the lungs and to the body. The atria are the two "collecting" chambers for the blood returning to the heart from the lungs and from the body. The electrical impulse of a heartbeat starts in the right atrium, travels across to the left atrium and down to the top of the ventricles. This causes the atria to contract and push blood through heart valves into the chambers of the heart called Ventricles. The contraction then has a slight pause as the impulse "stimulates" the atrioventricular node to pass the impulse down to the base of the right and left ventricles. When the impulse passes the AV node, the ventricles contract and push the blood out to the lungs to be oxygenated and to the body. A slight delay in the conduction of the impulse is normal but it is only a fraction of a second. Any delay in the conduction which is longer than the "normal" fraction of a second is considered an abnormal av conduction delay. Probable Left Atrial abnormality = some kind of abnormal size, shape, structure, or electrical conduction in the chamber at the top of the left side of the heart. Remember that the atria are chambers for collecting blood returning to the heart. The left atrium is the chamber for collecting blood which is returning from the lungs. This is freshly oxygenated blood. The blood travels from the lungs to the left atrium. When the atria contract, the blood is pushed from the left atrium into the left ventricle. When the ventricles contract, the blood is then pumped from the left ventricle out into the aorta (the largest artery in your body) and then on to the furthest reaches of your body.
Does heat loss happen more vigorously through conduction than radiation?
Depends on the material itself(for conduction) or it's surface and the temperature(for radiation) - at very high temperatures(like a lightbulb filament), radiation is far more significant then conduction, but a heatsink in a normal PC is doing to be far more dependant on conduction then radiation...
Is a solid liquid or gas sread by conduction?
Conduction is a form of heat transfer. The other forms are radiation and convection. Conduction is the normal way for heat to spread throughout a solid object. Convection is the normal way for gases and liquids.
Do normal microwaves use conduction?
No. They heat via radiation.
How exitatory and inhibitory interact in normal nerve function?
propagation of impulse pre synaptic to post synaptic
If a hearing threshold were at 50 dB HL by air conduction and 5 dB HL by bone conduction what type of hearing loss exists?
Conductive, assuming the scores represent the same ear. The bone conduction is within normal limits while the air conduction score represents a mild to moderate loss.
What is the difference conductive deafness and sensorineural deafness?
Conductive Loss - Normal hearing for bone conduction scores ([ & ]), and showing a hearing loss for Air Conduction scores (X &O) Sensorineural Loss- Hearing loss (equally) for both air and bone conduction
How do i get back into my sleeping pattern when I have jet lag?
For me, the only way to get back into my normal sleep pattern when I have jet lag is to stay awake through the entire day or night that I return and go to sleep at my normal time the following day.
Deafness results from conditions in the middle ear that block the normal transfer of vibrations from the tympanum to the oval window?
conduction
