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Questions and Answers
Qual es le effecto de un stimulation del systema nervose autonomic (SNA) super le excitabilitate del musculo cardiac?
Qual es le effecto de un stimulation del systema nervose autonomic (SNA) super le excitabilitate del musculo cardiac?
- Le excitabilitate non es influentiate per le SNA.
- Le SNA sempre diminue le excitabilitate, protegente le corde contra superstimulation.
- Le SNA pote augmentar o diminuir le excitabilitate dependente del neurotransmissores release. (correct)
- Le SNA sempre augmenta le excitabilitate, meliorante le reaction del corde a stimulos.
Qual es le rolo del nodo atrioventricular (AVN) in le conductivitate cardiac e que consequentia ha un dysfunction de iste nodo?
Qual es le rolo del nodo atrioventricular (AVN) in le conductivitate cardiac e que consequentia ha un dysfunction de iste nodo?
- Illo initia le impulso electric e su dysfunction resulta in un frequentia cardiac plus rapide.
- Illo retarda le impulso de circa 0.13 secundas, permitente le contraction atrial complete ante le ventricular; un dysfunction pote conducer a blocos cardiac. (correct)
- Illo excita directemente le fibras de Purkinje e su dysfunction causa un contraction atrial incoordinate.
- Illo transmittie le impulso directemente al musculos ventricular sin retardation e su dysfunction non ha consequentias.
Que representa le undas, intervallos e segmentos in un electrocardiogramma (ECG)?
Que representa le undas, intervallos e segmentos in un electrocardiogramma (ECG)?
- Activitate mechanic del corde, pression sanguinee e volumine de ejection.
- Potentials electric generate durante le depolarisation e repolarisation del atrios e ventriculos. (correct)
- Observationes visual del contractiones atrial e ventricular.
- Concentrationes de electrolytos, temperatura corporal e nivellos de stress.
Como se compara le frequentia de automaticitate del nodo sinoatrial (SAN) con celle del fibras de Purkinje, e que implicationes ha isto in le function normal del corde?
Como se compara le frequentia de automaticitate del nodo sinoatrial (SAN) con celle del fibras de Purkinje, e que implicationes ha isto in le function normal del corde?
Qual es le differentia inter factores inotropic positive e negative e como influe illos le contractilitate del musculo cardiac?
Qual es le differentia inter factores inotropic positive e negative e como influe illos le contractilitate del musculo cardiac?
Flashcards
Excitabilitate cardiac
Excitabilitate cardiac
Le capacitate de responder a stimulos e generar un action potential.
Conductivitate cardiac
Conductivitate cardiac
Le transmission de impulsos electric via le systema conductive cardiac.
Electrocardiogramma (ECG)
Electrocardiogramma (ECG)
Un registro graphic del activitate electric del corde.
Automaticitate cardiac
Automaticitate cardiac
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Contractilitate cardiac
Contractilitate cardiac
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Study Notes
- Cardiac muscle properties includes excitability, conductivity, electrocardiogram, automaticity, contractility, and circulation.
Excitability
- It is the ability to respond to stimuli
- It generates propagating action potential
- Followed by contraction
- Is affected by the autonomic nervous system (ANS)
- Is affected by hormones like thyroxine and adrenaline
Conductivity
- It is the transfer of impulses.
- This occurs via the cardiac conductive system.
- It includes the sinoatrial node (SAN).
- It includes the atrioventricular node (AVN) with a 0.13 second delay.
- It includes Bundle of His
- It includes Purkinje Fibers
Electrocardiogram (ECG)
- Graphic recordings of electrical potentials
- Includes 12 leads.
- Limb leads, which are standard and augmented.
- Chest leads (V1-V6)
- Interpretation is based on interpretation of vector direction
Automaticity
- It is the ability to initiate own impulses
- Impulses are regular and spontaneous
- Is independent of nerve supply
- Due to self-excitable fibers.
- Sinoatrial Node (SAN) generates 90-110 bpm
- Atrioventricular Node (AVN) generates 60 bpm
- Purkinje Fibers generates 30 bpm
- Ventricular Muscle generates 25 bpm
Contractility
- It is the conversion of electrical impulses to mechanical energy
- Systole is contraction
- Diastole is relaxation
- Affected by positive inotropic factors
- Affected by negative inotropic factors
- Affected by the nervous system (ANS)
- Affected by chemical factors like hormones and drugs
- Affected by physical factors like temperature
Circulation
- The pulmonary circulation sends deoxygenated blood to the lungs.
- The systemic circulation oxygenates blood to the body.
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Description
Le musculo cardiac possede proprietates specific como excitabilitate e conductibilitate. Le electrocardiogramma registra le potentiales electric. Automaticitate permitte initia proprie impulsos, e influentia hormonal es etiam crucial.
