#1
Which chamber of the heart receives oxygen-rich blood from the lungs?
Right atrium
Left atrium
Right ventricle
Left ventricle
#2
What is the purpose of heart valves?
To regulate blood flow and prevent backflow
To pump blood to the rest of the body
To exchange gases in the blood
To produce red blood cells
#3
What is the approximate size of an adult human heart?
About the size of a walnut
About the size of a fist
About the size of a tennis ball
About the size of a grapefruit
#4
Which blood vessels supply oxygenated blood to the heart muscle itself?
Pulmonary arteries
Pulmonary veins
Coronary arteries
Coronary veins
#5
What is the approximate resting heart rate for a healthy adult?
60-80 beats per minute
100-120 beats per minute
40-60 beats per minute
20-30 beats per minute
#6
Which of the following is NOT a major blood vessel connected to the heart?
Carotid artery
Pulmonary vein
Aorta
Inferior vena cava
#7
Which vessel carries deoxygenated blood from the heart to the lungs?
Pulmonary artery
Pulmonary vein
Aorta
Superior vena cava
#8
What is the function of the sinoatrial (SA) node in the heart?
To regulate blood pressure
To conduct electrical impulses and initiate heartbeats
To filter blood
To store oxygen in the heart
#9
What causes the lub-dub sound of the heartbeat?
Closure of the atrioventricular valves (tricuspid and mitral valves)
Opening of the semilunar valves (aortic and pulmonary valves)
Contraction of the atria
Relaxation of the ventricles
#10
Which part of the nervous system primarily controls heart rate?
Sympathetic nervous system
Parasympathetic nervous system
Central nervous system
Peripheral nervous system
#11
Which layer of the heart wall is responsible for contracting and pumping blood?
Endocardium
Myocardium
Pericardium
Epicardium
#12
What is the term for the relaxation phase of the heart's pumping cycle?
Diastole
Systole
Arrhythmia
Tachycardia
#13
Which of the following factors does NOT affect heart rate?
Physical activity
Temperature
Blood pressure
Eye color
#14
What is the medical term for a rapid heartbeat, typically more than 100 beats per minute?
Bradycardia
Tachycardia
Arrhythmia
Fibrillation
#15
Which hormone is responsible for increasing heart rate during times of stress or danger?
Insulin
Cortisol
Epinephrine
Melatonin
#16
Which of the following hormones increases heart rate?
Insulin
Adrenaline
Glucagon
Estrogen