Unkown ,Is It Really? Flashcards
What is the primary function of the heart’s electrical system?
To regulate the heartbeat and coordinate the contraction of heart muscles.
True or False: The sinoatrial (SA) node is known as the heart’s natural pacemaker.
True
Fill in the blank: The electrical impulses in the heart originate from the ______.
sinoatrial (SA) node
What structure follows the sinoatrial node in the conduction pathway of the heart?
Atrioventricular (AV) node
Multiple Choice: Which part of the heart receives electrical impulses from the AV node?
Bundle of His
What is the role of the Purkinje fibers in the heart?
To distribute electrical impulses throughout the ventricles.
True or False: The heart’s electrical impulses can be influenced by the nervous system.
True
What is the term for the period when the heart muscle is relaxed?
Diastole
Fill in the blank: The electrical conduction system of the heart is crucial for maintaining ______.
normal heart rhythm
Multiple Choice: Which of the following is NOT part of the heart’s conduction system?
Coronary arteries
What does an electrocardiogram (ECG) measure?
The electrical activity of the heart.
True or False: The ventricles contract before the atria.
False
What is the refractory period in cardiac muscle?
The time during which the heart muscle cannot be stimulated to contract.
Fill in the blank: The AV node delays the electrical impulse to ensure that the ______ contract before the ventricles.
atria
Multiple Choice: Which condition is characterized by an irregular heartbeat due to malfunctioning electrical impulses?
Arrhythmia
What is the significance of the Bundle of His in the conduction system?
It transmits impulses from the AV node to the ventricles.
True or False: Electrical impulses travel faster through the atria than the ventricles.
True
What does the P wave represent in an ECG?
Atrial depolarization.
Fill in the blank: The ______ is responsible for initiating the electrical impulse in the heart.
sinoatrial (SA) node
Multiple Choice: The heart’s electrical impulses are primarily regulated by which of the following?
The autonomic nervous system
What is the role of the sympathetic nervous system in heart function?
To increase heart rate and force of contraction.
True or False: The parasympathetic nervous system decreases heart rate.
True
What are ectopic beats?
Extra heartbeats that originate outside of the normal conduction pathway.
Fill in the blank: The ______ wave represents ventricular depolarization on an ECG.
QRS
Multiple Choice: Which part of the heart is primarily responsible for pumping blood to the lungs?
Right ventricle
What is the purpose of the cardiac cycle?
To describe the sequence of events in one heartbeat.
True or False: The heart can generate electrical impulses independently of the nervous system.
True
