Conduction of atrial impulses to the ventricles is variable and unpredictable. |
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We turn next to crocodiles and alligators, in which the heart has two anatomically separate ventricles. |
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As the impulse travels down the bundles, the ventricles contract and the cycle repeats itself. |
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Blood vessels that originate from the right and left ventricles are designated as arteries and have a distinctive structure. |
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Examination of the brain revealed only enlarged lateral and third ventricles. |
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The subarachnoid space is continuous with the cavities of the cerebral ventricles. |
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Unlike a human heart, which has two ventricles or pumping chambers, a reptile heart has only one. |
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This encroachment on brain tissue by enlarged ventricles impinges on the caliber of arterioles and capillaries, often resulting in ischemia. |
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This new pressure distends the ventricles, stretching surrounding nerve fibers and compressing the periventricular parenchyma. |
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In first degree block there is a delay in conduction of the atrial impulse to the ventricles, usually at the level of the atrioventricular node. |
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Thus, after delay in the atrioventricular mode, atrial contraction is followed by rapid and coordinated contraction of the ventricles. |
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Arteries carried in with the pial fold provide the choroid plexuses of the 3rd and lateral ventricles. |
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It has a real beating heart with all its auricles, ventricles and valves in their anatomically correct positions. |
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These include the respiratory epithelium of the airways, the embryonic node, and the ependyma of the brain ventricles. |
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Interestingly, in both ventricles myocytes adjacent to the adipose tissue showed multiple sarcoplasmic vacuoles. |
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Common findings on brain imaging include enlarged ventricles, widened cortical sulci, and cerebral, cerebellar, or brain stem atrophy. |
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They had less grey matter in the frontal lobes and had enlarged ventricles. |
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He stated that the fore part of the brain contained three ventricles, and the hinder part, one. |
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Intraventricular meningiomas are rare but typically occur around the choroid plexus in the trigone of the lateral ventricles. |
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The ventricles respond irregularly to the dysrhythmic bombardment from the atria. |
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The MRI scans were used to quantify total volume of the cerebrum, lateral ventricles, hippocampus and amygdala. |
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The ventricles each contain a choroid plexus that secretes cerebrospinal fluid. |
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Both groups of children were born with left ventricles that, on average, had higher mass and lower contractility, or a diminished ability to pump. |
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Escape rhythms are the result of spontaneous activity from a subsidiary pacemaker, located in the atria, atrioventricular junction, or ventricles. |
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Crocodilians' hearts have four chambers like mammals and birds, but there is a pore between the left and right ventricles which allows some mixing. |
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From the lateral ventricles CSF drains into the central third ventricle, and thence through the aqueduct in the midbrain into the fourth ventricle. |
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Blood flows from the atria to the ventricles through a one-way valve. |
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One area is the subventricular zone of the lateral ventricles, which are fluid-filled cavities in both brain hemispheres connected to the central canal of the spinal cord. |
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Contraction of the right and left atria forces blood past the right tricuspid and left bicuspid valves into the right and left ventricles, respectively. |
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When the ventricles are normally situated, this means that the aorta is connected to the right ventricle and the pulmonary artery to the left ventricle. |
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Some children with congenital heart abnormalities have fine tungsten spirals inserted into the heart to plug small holes between the cavities of the two ventricles. |
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Third-degree AV block or complete heart block is present when impulses from the atrium are not conducted to the ventricles. |
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The mammalian heart has four chambers, two upper atria, the receiving chambers, and two lower ventricles, the discharging chambers. |
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The impulse reaches the atrioventricular node, where it's momentarily delayed before it spreads throughout the walls of the ventricles. |
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Both ventricles had normal systolic function, and both atrioventricular valves were completely competent. |
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The heart was in standstill, hazy clots filling the ventricles. |
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The QT interval is the time it takes for depolarisation and repolarisation of the ventricles of the heart. |
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An additional atrioventricular ring has been designed to make fast depolarization of the ventricles. |
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Thus, at times sinus rhythm completely captures the ventricles and at other times shows isorhythmic atrioventricular dissociation from an idioventricular rhythm. |
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Hydrocephalus develops an elevated intracranial pressure due to increased cerebral-spinal fluid, which can compress the brain and dilate the ventricles. |
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Architecture of myocardial cells in human cardiac ventricles with concentric and eccentric hypertrophy as demonstrated by quantitative scanning electron microscopy. |
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He noticed that the two ventricles move together almost simultaneously and not independently like had been thought previously by his predecessors. |
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The selected section from vehicle control showed well developed lateral ventricles, olfactory process, pones, cerebral hemispheres and diencephalons. |
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Neurogenesis occurs in neural stem cells of the subventricular zone of the lateral ventricles, subgranular layer of the dentate gyrus, and olfactory bulbs. |
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A head CT revealed enlarged ventricles without shift and cerebral edema. |
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It appears that inflammation had damaged those brain cells and prevented that region of the brain from developing, and the ventricles simply expanded to fill the space. |
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The atria, ventricles, and septum are supplied of blood by this modality. |
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