18 Questions
What is vagal tone?
Continuous impulses in the vagus nerve that decrease the heart rate
What is the property of cardiac muscle known as conductivity?
Ability to transmit an action potential over the whole heart
Which part of the heart initiates the cardiac impulse?
SA Node
What is the function of the AV Node delay?
Allows time for proper ventricular filling
What is the role of Purkinje fibers in the heart's conductivity?
Rapidly conduct impulses to excite the entire ventricle
What is a 'heart block' in terms of heart conduction?
Block in transmission of impulse
What are the properties of cardiac muscle?
Involuntary, striated, and highly resistant to fatigue
Describe the different chambers of the heart.
The heart consists of four chambers: two atria (right and left) and two ventricles (right and left).
What is the anatomical structure of the heart?
The heart is a hollow, muscular organ located between the lungs in the thoracic cavity.
How do heart valves function in the cardiovascular system?
Heart valves prevent backward flow of blood and ensure unidirectional blood flow through the heart.
Explain the function of the conductive system in the heart.
The conductive system coordinates the heartbeat by generating and transmitting electrical impulses that regulate the heart's contraction.
What is the importance of the cardiac cycle in the heart's function?
The cardiac cycle is crucial for pumping blood throughout the body, ensuring oxygen and nutrient delivery to tissues.
What are the four chambers of the heart?
2 atria (right and left) and 2 ventricles (right and left)
Name the two types of valves found in the heart.
Atrioventricular valves and Semilunar valves
What is the outermost covering of the heart called?
Pericardial sac
What are the three parts that make up the wall of the heart itself?
Epicardium, Myocardium, Endocardium
What is the dark area that separates individual cardiac cells from one another?
Intercalated disc
What allows rapid diffusion of ions between cardiac cells, making the cardiac muscle function like a single unit?
Gap junction
Learn about the concept of vagal tone, which impacts heart rate, and the conductivity properties of cardiac muscle in transmitting action potentials. Explore the different conduction velocities in the SA Node, AV Node, Bundle of His, and Purkinje fibers.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
