CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which sequence correctly traces oxygenated blood returning from lungs?
A. left ventricle → aortic valve → aorta → systemic arteries
B. lungs → pulmonary veins → left atrium → mitral valve → left ventricle
C. right ventricle → pulmonary valve → pulmonary artery → lungs
D. systemic veins → venae cavae → right atrium → tricuspid valve → right ventricle
Correct Answer: B
The pathway is lungs → pulmonary veins → left atrium → mitral valve → left ventricle.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which sequence correctly traces blood traveling from heart to lungs?
A. systemic veins → venae cavae → right atrium → tricuspid valve → right ventricle
B. left ventricle → aortic valve → aorta → systemic arteries
C. lungs → pulmonary veins → left atrium → mitral valve → left ventricle
D. right ventricle → pulmonary valve → pulmonary artery → lungs
Correct Answer: D
The pathway is right ventricle → pulmonary valve → pulmonary artery → lungs.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which sequence correctly traces venous blood returning from the body?
A. left ventricle → aortic valve → aorta → systemic arteries
B. right ventricle → pulmonary valve → pulmonary artery → lungs
C. lungs → pulmonary veins → left atrium → mitral valve → left ventricle
D. systemic veins → venae cavae → right atrium → tricuspid valve → right ventricle
Correct Answer: D
The pathway is systemic veins → venae cavae → right atrium → tricuspid valve → right ventricle.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
The T wave mainly represents:
A. Ventricular depolarization
B. SA-node firing only
C. Ventricular repolarization
D. Atrial depolarization
Correct Answer: C
T wave = ventricular repolarization.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
The QRS complex mainly represents:
A. Ventricular filling
B. Aortic pressure
C. Atrial repolarization only
D. Ventricular depolarization
Correct Answer: D
QRS = ventricular depolarization.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
The P wave mainly represents:
A. Ventricular repolarization
B. Ventricular depolarization
C. Atrial depolarization
D. Valve closure
Correct Answer: C
P wave = atrial depolarization.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
An ECG records the heart's:
A. Electrical activity
B. Valve anatomy directly
C. Blood glucose
D. Oxygen content only
Correct Answer: A
ECG records electrical potential changes.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Diastole refers primarily to a phase of:
A. Gas exchange
B. Blood clotting
C. Cardiac relaxation and filling
D. Ventricular ejection only
Correct Answer: C
Diastole is relaxation/filling.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Systole refers primarily to a phase of:
A. Blood-cell production
B. Cardiac contraction
C. Cardiac filling only
D. Valve formation
Correct Answer: B
Systole is contraction.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
The second heart sound is mainly due to closure of the:
A. Atria
B. Atrioventricular valves
C. Semilunar valves
D. Venae cavae
Correct Answer: C
S2 mainly reflects aortic/pulmonary closure.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
The first heart sound is mainly due to closure of the:
A. Semilunar valves
B. Atrioventricular valves
C. Venae cavae
D. Coronary arteries
Correct Answer: B
S1 mainly reflects mitral/tricuspid closure.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which artery normally carries deoxygenated blood?
A. Carotid artery
B. Coronary artery
C. Aorta
D. Pulmonary artery
Correct Answer: D
The pulmonary artery carries venous blood to lungs.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which vessels carry oxygenated blood from lungs to heart?
A. Coronary veins
B. Venae cavae
C. Pulmonary arteries
D. Pulmonary veins
Correct Answer: D
Pulmonary veins return oxygenated blood to left atrium.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
The human heart normally has how many chambers?
A. 2
B. 3
C. 6
D. 4
Correct Answer: D
The heart has two atria and two ventricles.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which cardiac structure is best identified by the following role/location: supply oxygenated blood to the heart muscle?
A. Left atrium
B. Coronary arteries
C. Tricuspid valve
D. Bundle of His
Correct Answer: B
The cardiac structure matching 'supply oxygenated blood to the heart muscle' is Coronary arteries.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which role/location is correctly associated with Coronary arteries?
A. supply oxygenated blood to the heart muscle
B. guards the outflow from right ventricle to pulmonary trunk
C. rapidly distribute excitation through ventricular myocardium
D. receives oxygenated blood from pulmonary veins
Correct Answer: A
Coronary arteries is associated with supply oxygenated blood to the heart muscle.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which cardiac structure is best identified by the following role/location: rapidly distribute excitation through ventricular myocardium?
A. Right ventricle
B. Purkinje fibers
C. Right atrium
D. Left ventricle
Correct Answer: B
The cardiac structure matching 'rapidly distribute excitation through ventricular myocardium' is Purkinje fibers.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which role/location is correctly associated with Purkinje fibers?
A. receives oxygenated blood from pulmonary veins
B. rapidly distribute excitation through ventricular myocardium
C. normally initiates the heartbeat
D. lies between left atrium and left ventricle
Correct Answer: B
Purkinje fibers is associated with rapidly distribute excitation through ventricular myocardium.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which cardiac structure is best identified by the following role/location: conducts impulses from AV node into the ventricular conduction system?
A. Bundle of His
B. Coronary arteries
C. Purkinje fibers
D. Mitral valve
Correct Answer: A
The cardiac structure matching 'conducts impulses from AV node into the ventricular conduction system' is Bundle of His.
CSS - PMS - CCE - PCS - Everyday Science
Human Heart
Which role/location is correctly associated with Bundle of His?
A. pumps oxygenated blood into the aorta
B. conducts impulses from AV node into the ventricular conduction system
C. lies between left atrium and left ventricle
D. lies between right atrium and right ventricle
Correct Answer: B
Bundle of His is associated with conducts impulses from AV node into the ventricular conduction system.