#1
Which of the following is NOT a function of the heart?
Producing hormones
ExplanationHeart primarily pumps blood and does not produce hormones.
#2
Which chamber of the heart receives oxygenated blood from the lungs?
Left atrium
ExplanationLeft atrium receives oxygenated blood from the lungs.
#3
Which vessel carries deoxygenated blood from the heart to the lungs?
Pulmonary artery
ExplanationPulmonary artery carries blood to the lungs for oxygenation.
#4
Which of the following is NOT a risk factor for cardiovascular disease?
Low cholesterol levels
ExplanationLow cholesterol levels are considered beneficial for heart health.
#5
What is the primary function of the sinoatrial (SA) node?
Conduct electrical impulses
ExplanationInitiates the electrical impulses that regulate heart rhythm.
#6
During which phase of the cardiac cycle does ventricular contraction occur?
Ventricular systole
ExplanationVentricular systole is the contraction phase.
#7
What is the term for the volume of blood ejected by the left ventricle in one contraction?
Stroke volume
ExplanationStroke volume is the amount of blood ejected per beat.
#8
What is the purpose of the atrioventricular (AV) node in the heart?
Delay impulse transmission
ExplanationAV node delays the electrical impulse to allow atria to contract fully.
#9
Which of the following hormones increases heart rate and force of contraction?
Epinephrine
ExplanationEpinephrine acts as a 'fight or flight' hormone.
#10
Which coronary artery supplies blood to the left ventricle and interventricular septum?
Left anterior descending artery
ExplanationLAD artery supplies blood to the left ventricle and septum.