cardiac reflex

简明释义

心脏反射

英英释义

例句

1.Understanding the cardiac reflex 心脏反射 is crucial for cardiologists when diagnosing heart conditions.

了解cardiac reflex 心脏反射对于心脏病专家在诊断心脏病时至关重要。

2.Patients with certain neurological disorders may have an altered cardiac reflex 心脏反射 response.

患有某些神经系统疾病的患者可能会有改变的cardiac reflex 心脏反射反应。

3.The cardiac reflex 心脏反射 helps regulate heart rate in response to various stimuli.

在对各种刺激作出反应时，cardiac reflex 心脏反射有助于调节心率。

4.During the physical examination, the doctor checked for any abnormal cardiac reflex 心脏反射 responses to assess the patient's heart health.

在体检过程中，医生检查了患者的心脏健康是否存在异常的cardiac reflex 心脏反射反应。

5.The cardiac reflex 心脏反射 can be triggered by sudden changes in blood pressure during exercise.

在运动期间，突然的血压变化可以触发cardiac reflex 心脏反射。

作文

The human body is a complex system that relies on various mechanisms to maintain homeostasis and respond to internal and external stimuli. One such mechanism is the cardiac reflex, which plays a crucial role in regulating heart function and blood circulation. The cardiac reflex refers to a series of involuntary responses that occur in the heart and blood vessels in reaction to changes in blood pressure, blood volume, and other physiological factors. This reflex is essential for maintaining adequate blood flow to vital organs, especially during times of stress or physical activity.To better understand the cardiac reflex, it is important to look at how it operates within the cardiovascular system. When blood pressure rises, baroreceptors located in the walls of the arteries detect this change. These specialized nerve endings send signals to the brain, specifically the medulla oblongata, which is responsible for autonomic functions. In response, the brain activates the parasympathetic nervous system, leading to a decrease in heart rate and dilation of blood vessels. This process helps to lower blood pressure back to a normal range, illustrating the body's ability to self-regulate through the cardiac reflex.Conversely, when blood pressure drops, the opposite occurs. The baroreceptors send fewer signals to the brain, prompting the sympathetic nervous system to take action. This results in an increase in heart rate and constriction of blood vessels, effectively raising blood pressure to ensure that blood flow remains adequate to the brain and other critical areas. This dynamic interplay between the sympathetic and parasympathetic systems underscores the importance of the cardiac reflex in maintaining cardiovascular stability.In addition to blood pressure regulation, the cardiac reflex also responds to other stimuli such as physical exertion, emotional stress, and postural changes. For instance, during exercise, the body requires more oxygen and nutrients, which leads to an increase in heart rate and cardiac output. The cardiac reflex facilitates this by adjusting the heart's pumping action to meet the heightened demands of the body. Similarly, when a person stands up quickly, gravity causes blood to pool in the legs, potentially leading to a drop in blood pressure. The cardiac reflex quickly compensates for this by increasing heart rate and constricting blood vessels to maintain cerebral perfusion and prevent fainting.Understanding the cardiac reflex is not only important for grasping basic physiological principles but also has practical implications in clinical settings. Abnormalities in this reflex can lead to various cardiovascular issues, including hypertension, orthostatic hypotension, and even heart failure. Medical professionals often assess the integrity of the cardiac reflex through tests that measure heart rate variability and blood pressure responses to different stimuli.In conclusion, the cardiac reflex is a vital component of the cardiovascular system, ensuring that the heart and blood vessels respond appropriately to changes in the body's needs. By understanding this reflex, we gain insight into how our bodies maintain balance and adapt to various conditions. As research continues to uncover the intricacies of the cardiac reflex, we can appreciate its significance in both health and disease, highlighting the remarkable capabilities of the human body to self-regulate and sustain life.

人体是一个复杂的系统，依赖多种机制来维持体内平衡并对内部和外部刺激做出反应。其中一种机制是心脏反射，它在调节心脏功能和血液循环中发挥着至关重要的作用。心脏反射指的是一系列无意识的反应，这些反应发生在心脏和血管中，以回应血压、血容量和其他生理因素的变化。这种反射对于维持重要器官的适当血流至关重要，特别是在压力或身体活动时期。为了更好地理解心脏反射，重要的是要了解它在心血管系统中的运作方式。当血压升高时，位于动脉壁中的压力感受器会检测到这一变化。这些专门的神经末梢将信号发送到大脑，特别是负责自主功能的延髓。作为响应，大脑激活副交感神经系统，导致心率下降和血管扩张。这个过程有助于将血压降低到正常范围，展示了身体通过心脏反射自我调节的能力。相反，当血压下降时，情况正好相反。压力感受器向大脑发送的信号减少，促使交感神经系统采取行动。这导致心率增加和血管收缩，有效地提高血压，以确保大脑和其他关键区域的血流保持充足。这种交感和副交感系统之间的动态互动强调了心脏反射在维持心血管稳定性方面的重要性。除了血压调节，心脏反射还会对其他刺激做出反应，例如身体运动、情绪压力和姿势变化。例如，在锻炼期间，身体需要更多的氧气和营养物质，这导致心率和心输出量增加。心脏反射通过调整心脏的泵血动作以满足身体的高度需求来促进这一过程。同样，当一个人快速站起来时，重力导致血液在腿部聚集，可能导致血压下降。心脏反射迅速对此作出补偿，通过增加心率和收缩血管来维持大脑灌注，防止晕厥。理解心脏反射不仅对掌握基本生理原理很重要，而且在临床环境中也具有实际意义。该反射的异常可能导致各种心血管问题，包括高血压、体位性低血压甚至心力衰竭。医疗专业人士通常通过测量心率变异性和血压对不同刺激反应的测试来评估心脏反射的完整性。总之，心脏反射是心血管系统的重要组成部分，确保心脏和血管能够适当地响应身体需求的变化。通过理解这一反射，我们可以深入了解我们的身体如何维持平衡并适应各种条件。随着研究继续揭示心脏反射的复杂性，我们能够欣赏它在健康和疾病中的重要性，突显人类身体自我调节和维持生命的非凡能力。