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Vagal Tone and Cardiac Muscle Conductivity

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Vagal Tone and Cardiac Muscle Conductivity

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Questions and Answers

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 Signup and view all the answers

What is the role of Purkinje fibers in the heart's conductivity?

Rapidly conduct impulses to excite the entire ventricle Signup and view all the answers

What is a 'heart block' in terms of heart conduction?

Block in transmission of impulse Signup and view all the answers

What are the properties of cardiac muscle?

Involuntary, striated, and highly resistant to fatigue Signup and view all the answers

Describe the different chambers of the heart.

The heart consists of four chambers: two atria (right and left) and two ventricles (right and left). Signup and view all the answers

What is the anatomical structure of the heart?

The heart is a hollow, muscular organ located between the lungs in the thoracic cavity. Signup and view all the answers

How do heart valves function in the cardiovascular system?

Heart valves prevent backward flow of blood and ensure unidirectional blood flow through the heart. Signup and view all the answers

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. Signup and view all the answers

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. Signup and view all the answers

What are the four chambers of the heart?

2 atria (right and left) and 2 ventricles (right and left) Signup and view all the answers

Name the two types of valves found in the heart.

Atrioventricular valves and Semilunar valves Signup and view all the answers

What is the outermost covering of the heart called?

Pericardial sac Signup and view all the answers

What are the three parts that make up the wall of the heart itself?

Epicardium, Myocardium, Endocardium Signup and view all the answers

What is the dark area that separates individual cardiac cells from one another?

Intercalated disc Signup and view all the answers

What allows rapid diffusion of ions between cardiac cells, making the cardiac muscle function like a single unit?

Gap junction Signup and view all the answers