| 单词 | SA node |
| 例句 | Electrical charges spontaneously pulse from the SA node causing the two atria to contract in unison. Biology for AP Courses 2022-06-09T00:00:00Z Since the SA node is the pacemaker, it reaches threshold faster than any other component of the conduction system. Anatomy and Physiology 2013-06-19T00:00:00Z An electrical charge spontaneously pulses from SA node causing two atria to contract. Biology for AP Courses 2022-06-09T00:00:00Z Should there be a delay in passage of the impulse from the SA node to the AV node, it would be visible in the PR interval. Anatomy and Physiology 2013-06-19T00:00:00Z A defibrillator effectively stops the heart so that the SA node can trigger a normal conduction cycle. Anatomy and Physiology 2013-06-19T00:00:00Z Electrical charges pulse from the SA node causing the two atria to contract in unison; then the pulse reaches the atrioventricular node between the right atrium and right ventricle. Biology for AP Courses 2022-06-09T00:00:00Z The SA node, without nervous or endocrine control, would initiate a heart impulse approximately 80–100 times per minute. Anatomy and Physiology 2013-06-19T00:00:00Z SA nodal blocks occur within the SA node. Anatomy and Physiology 2013-06-19T00:00:00Z A second-degree or incomplete block occurs when some impulses from the SA node reach the AV node and continue, while others do not. Anatomy and Physiology 2013-06-19T00:00:00Z The sinus venosus develops into the posterior portion of the right atrium, the SA node, and the coronary sinus. Anatomy and Physiology 2013-06-19T00:00:00Z An electrical charge spontaneously pulses from SA node causing two atria to contract. Biology for AP Courses 2022-06-09T00:00:00Z Although each component of the conduction system is capable of generating its own impulse, the rate progressively slows as you proceed from the SA node to the Purkinje fibers. Anatomy and Physiology 2013-06-19T00:00:00Z The SA node has the highest inherent rate of depolarization and is known as the pacemaker of the heart. Anatomy and Physiology 2013-06-19T00:00:00Z This impulse spreads from its initiation in the SA node throughout the atria through specialized internodal pathways, to the atrial myocardial contractile cells and the atrioventricular node. Anatomy and Physiology 2013-06-19T00:00:00Z Figure 19.19 illustrates the initiation of the impulse in the SA node that then spreads the impulse throughout the atria to the atrioventricular node. Anatomy and Physiology 2013-06-19T00:00:00Z An electrical charge spontaneously pulses from SA node causing two atria to contract. Biology for AP Courses 2022-06-09T00:00:00Z Without the SA node, the AV node would generate a heart rate of 40–60 beats per minute. Anatomy and Physiology 2013-06-19T00:00:00Z The total time elapsed from the initiation of the impulse in the SA node until depolarization of the ventricles is approximately 225 ms. Anatomy and Physiology 2013-06-19T00:00:00Z Without any nervous stimulation, the SA node would establish a sinus rhythm of approximately 100 bpm. Anatomy and Physiology 2013-06-19T00:00:00Z Normally, vagal stimulation predominates as, left unregulated, the SA node would initiate a sinus rhythm of approximately 100 bpm. Anatomy and Physiology 2013-06-19T00:00:00Z The pulse reaches SA node where it pauses before spreading to the walls of the ventricles. Biology for AP Courses 2022-06-09T00:00:00Z |
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