L3 Quiz, BMS204

Which node is known as the pacemaker of the heart?

Sinoatrial node (SAN) (correct)
Purkinje fibers
Bundle of His
Atrioventricular node (AVN)

What is the approximate weight of the heart in females?

250 gm (correct)
320 gm
200 gm
300 gm

Which of the following is NOT a layer of the heart wall?

Epicardium
Myocardium
Endocardium
Pericardium (correct)

What is the function of the atrioventricular node (AVN)?

Conducts the impulse to the atrioventricular bundle (A) Signup and view all the answers

Which of the following is NOT a type of cardiac muscle fiber?

Connective fibers (C) Signup and view all the answers

Which of the following is NOT a function of the atria?

Pumping blood into the aorta and pulmonary artery (C) Signup and view all the answers

What is the resting membrane potential of the sinoatrial node (SAN)?

-40 mV (B) Signup and view all the answers

Which of the following is responsible for the self-excitation of SAN fibers?

Natural leakiness of the membrane to Na+ (A) Signup and view all the answers

What separates the atria from the ventricles?

Fibrous skeleton (D) Signup and view all the answers

Which of the following is NOT a property of cardiac muscle?

Elasticity (B) Signup and view all the answers

Which of the following statements about the structure of cardiac muscle is INCORRECT?

Gap junctions have high electric resistance. (B) Signup and view all the answers

What is the significance of the slow conductivity in the atrioventricular node (AVN)?

Gives time for atria to empty blood into ventricles (B) Signup and view all the answers

Which of the following is NOT a characteristic of Purkinje fibers?

Slow conduction velocity (B) Signup and view all the answers

What is the effect of sympathetic stimulation on the heart rate?

Increases heart rate (D) Signup and view all the answers

Which of the following is NOT a function of the ventricles?

Blood reservoirs during atrial systole (A) Signup and view all the answers

What is the role of gap junctions in cardiac muscle?

Transmit electrical currents for cell-to-cell conduction (C) Signup and view all the answers

Which of the following is NOT a factor affecting rhythmicity?

Blood pressure (D) Signup and view all the answers

What is the mechanism of parasympathetic stimulation on the sinoatrial node (SAN) rhythm?

Increases K+ efflux (B) Signup and view all the answers

Which of the following is NOT a phase of the SAN action potential?

Plateau phase (A) Signup and view all the answers

What is the threshold level for the membrane potential in the SAN action potential?

-40 mV (B) Signup and view all the answers

Which of the following is NOT a component of the action potential?

Resting potential (D) Signup and view all the answers

What is the function of the Na-K pump in repolarization?

Resumes the normal polarity and ionic distribution (C) Signup and view all the answers

Which of the following is NOT a characteristic of the action potential?

Caused by an ineffective stimulus (C) Signup and view all the answers

What is the main function of the fibrous skeleton of the heart?

Provides structural support and insulation (B) Signup and view all the answers

Which of the following is NOT a characteristic of contractile muscle fibers?

Initiate and propagate the heartbeat (C) Signup and view all the answers

What is the main function of the intercalated discs in cardiac muscle?

Facilitate cell-to-cell conduction (A) Signup and view all the answers

Which of the following is NOT a characteristic of nodal fibers?

Responsible for the contractile function of the heart (A) Signup and view all the answers

What is the main function of the conducting fibers in the heart?

Transmit electrical impulses throughout the heart (C) Signup and view all the answers

Which of the following is NOT a component of the conducting system of the heart?

Chordae tendineae (B) Signup and view all the answers

What is the significance of the vagus escape phenomena?

Prevents the heart from stopping completely under high vagal tone (B) Signup and view all the answers

What is the function of the Na-K pump in repolarization?

Resumes the normal polarity and ionic distribution (A) Signup and view all the answers

Which of the following is NOT a characteristic of the action potential?

Caused by an ineffective stimulus (D) Signup and view all the answers

What is the main function of the fibrous skeleton of the heart?

Provides structural support and insulation (A) Signup and view all the answers

Which of the following is NOT a characteristic of contractile muscle fibers?

Initiate and propagate the heartbeat (B) Signup and view all the answers

What is the main function of the intercalated discs in cardiac muscle?

Facilitate cell-to-cell conduction (B) Signup and view all the answers

Which of the following is NOT a characteristic of nodal fibers?

Responsible for the contractile function of the heart (B) Signup and view all the answers

What is the main function of the conducting fibers in the heart?

Transmit electrical impulses throughout the heart (A) Signup and view all the answers

Which of the following is NOT a component of the conducting system of the heart?

Chordae tendineae (D) Signup and view all the answers

What is the significance of the vagus escape phenomena?

Prevents the heart from stopping completely under high vagal tone (A) Signup and view all the answers

In the sinoatrial (SA) node, phase 4 depolarization (pacemaker potential) is attributed to:

An increase in Na+ conductance (A) Signup and view all the answers

L3 Quiz, BMS204

Choose a study mode

Podcast

Questions and Answers

Which node is known as the pacemaker of the heart?

What is the approximate weight of the heart in females?

Which of the following is NOT a layer of the heart wall?

What is the function of the atrioventricular node (AVN)?

Which of the following is NOT a type of cardiac muscle fiber?

Which of the following is NOT a function of the atria?

What is the resting membrane potential of the sinoatrial node (SAN)?

Which of the following is responsible for the self-excitation of SAN fibers?

What separates the atria from the ventricles?

Which of the following is NOT a property of cardiac muscle?

Which of the following statements about the structure of cardiac muscle is INCORRECT?

What is the significance of the slow conductivity in the atrioventricular node (AVN)?

Which of the following is NOT a characteristic of Purkinje fibers?

What is the effect of sympathetic stimulation on the heart rate?

Which of the following is NOT a function of the ventricles?

What is the role of gap junctions in cardiac muscle?

Which of the following is NOT a factor affecting rhythmicity?

What is the mechanism of parasympathetic stimulation on the sinoatrial node (SAN) rhythm?

Which of the following is NOT a phase of the SAN action potential?

What is the threshold level for the membrane potential in the SAN action potential?

Which of the following is NOT a component of the action potential?

What is the function of the Na-K pump in repolarization?

Which of the following is NOT a characteristic of the action potential?

What is the main function of the fibrous skeleton of the heart?

Which of the following is NOT a characteristic of contractile muscle fibers?

What is the main function of the intercalated discs in cardiac muscle?

Which of the following is NOT a characteristic of nodal fibers?

What is the main function of the conducting fibers in the heart?

Which of the following is NOT a component of the conducting system of the heart?

What is the significance of the vagus escape phenomena?

What is the function of the Na-K pump in repolarization?

Which of the following is NOT a characteristic of the action potential?

What is the main function of the fibrous skeleton of the heart?

Which of the following is NOT a characteristic of contractile muscle fibers?

What is the main function of the intercalated discs in cardiac muscle?

Which of the following is NOT a characteristic of nodal fibers?

What is the main function of the conducting fibers in the heart?

Which of the following is NOT a component of the conducting system of the heart?

What is the significance of the vagus escape phenomena?

In the sinoatrial (SA) node, phase 4 depolarization (pacemaker potential) is attributed to:

Related Documents

More Like This

L3 SAQ Pharmaceutical Regulatory Authorities Quiz

L3 MCQ Pharmaceutical Regulatory Authorities Quiz

Anatomical View of Esophagus and Stomach Quiz L3

Quiz L3 - TEL1