Circulatory System Functions and Anatomy

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What is the main function of the circulatory system?

Pumping blood to the lungs and different organs of the body

Regulating body temperature and producing antibodies

Creating a defensive mechanism against external threats

Transporting gases, waste products, and hormones (correct)

Which chamber of the heart receives blood from the lungs?

Left atrium (correct)

Right atrium

Right ventricle

Left ventricle

How many cusps are the Tricuspid and Semilunar valves formed of?

2 cusps

3 cusps (correct)

4 cusps

5 cusps

When does the mechanical contraction (systole) of cardiac muscle start in relation to depolarization?

After depolarization Signup and view all the answers

What is the duration of the relative refractory period (RRP) in relation to excitability?

Excitability is decreased Signup and view all the answers

How long does the mechanical response last in relation to the duration of the action potential?

1.5 times as long as the duration of the action potential Signup and view all the answers

During which phase of the cardiac cycle does the supernormal phase of excitability coincide?

Second half of diastole Signup and view all the answers

What are the automatic fibers involved in the transmission of electrical signals in the heart?

S.A.N, A.V.N, and purkinje fibers Signup and view all the answers

What is the speed of transmission in the A.V. node?

0.02-0.03 meters/sec Signup and view all the answers

Which factor affects the force of myocardial contraction based on Starling’s Law?

Initial length of cardiac muscle fibers Signup and view all the answers

What is the period during which the ventricles contract, forcing blood out into the aorta and main pulmonary artery?

Systole Signup and view all the answers

What is the physiological importance of A-V nodal delay?

It protects the ventricles against atrial fibrillation Signup and view all the answers

Which stimulation has a positive inotropic effect on the heart?

Adrenaline stimulation Signup and view all the answers

What is the volume of blood pumped by each ventricle per beat known as?

(EDV – ESV) Signup and view all the answers

What is the function of the tricuspid valve in the heart?

Receives blood from the body through superior and inferior vena cava Signup and view all the answers

What coincides with the absolute refractory period (A.R.P) of the cardiac muscle?

Depolarization phase Signup and view all the answers

What is the main function of the left ventricle in the heart?

Pumping blood to reach different organs of the body Signup and view all the answers

What is the relation between mechanical response and action potential in the cardiac muscle?

Mechanical response lasts 1.5 times as long as the duration of action potential Signup and view all the answers

What is the relationship between relaxation (diastole) and repolarization in the cardiac muscle?

Relaxation starts with rapid repolarization phase Signup and view all the answers

How many cusps are formed in the mitral valve of the heart?

2 cusps Signup and view all the answers

What is the period during which the ventricles relax and refill with blood known as?

Diastole Signup and view all the answers

Which factor directly affects the force of myocardial contraction based on Starling’s Law?

Preload Signup and view all the answers

What is the volume of blood pumped by each ventricle per beat known as?

Stroke volume Signup and view all the answers

During which phase of the cardiac cycle does the supernormal phase of excitability coincide?

Diastole Signup and view all the answers

What does tachycardia (increased heart rate) have on the force of contraction?

Increases force of contraction Signup and view all the answers

What is the speed of transmission in the A.V. node?

~0.02-0.03 meters/sec Signup and view all the answers

What are the physiological causes of A-V nodal delay?

Less negative resting membrane potential Signup and view all the answers

What is the main function of the circulatory system?

Transportation of nutrients and waste products Signup and view all the answers

Circulatory System Functions and Anatomy

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Questions and Answers

What is the main function of the circulatory system?

Which chamber of the heart receives blood from the lungs?

How many cusps are the Tricuspid and Semilunar valves formed of?

When does the mechanical contraction (systole) of cardiac muscle start in relation to depolarization?

What is the duration of the relative refractory period (RRP) in relation to excitability?

How long does the mechanical response last in relation to the duration of the action potential?

During which phase of the cardiac cycle does the supernormal phase of excitability coincide?

What are the automatic fibers involved in the transmission of electrical signals in the heart?

What is the speed of transmission in the A.V. node?

Which factor affects the force of myocardial contraction based on Starling’s Law?

What is the period during which the ventricles contract, forcing blood out into the aorta and main pulmonary artery?

What is the physiological importance of A-V nodal delay?

Which stimulation has a positive inotropic effect on the heart?

What is the volume of blood pumped by each ventricle per beat known as?

What is the function of the tricuspid valve in the heart?

What coincides with the absolute refractory period (A.R.P) of the cardiac muscle?

What is the main function of the left ventricle in the heart?

What is the relation between mechanical response and action potential in the cardiac muscle?

What is the relationship between relaxation (diastole) and repolarization in the cardiac muscle?

How many cusps are formed in the mitral valve of the heart?

What is the period during which the ventricles relax and refill with blood known as?

Which factor directly affects the force of myocardial contraction based on Starling’s Law?

What is the volume of blood pumped by each ventricle per beat known as?

During which phase of the cardiac cycle does the supernormal phase of excitability coincide?

What does tachycardia (increased heart rate) have on the force of contraction?

What is the speed of transmission in the A.V. node?

What are the physiological causes of A-V nodal delay?

What is the main function of the circulatory system?

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