What is the main function of the circulatory system?
A) Digestion of food
B) Transport of oxygen and nutrients
C) Production of hormones
D) Control of body temperature
Which organ is responsible for pumping blood throughout the body?
A) Lungs
B) Liver
C) Heart
D) Brain
What type of blood vessel carries blood away from the heart?
A) Veins
B) Capillaries
C) Arteries
D) Venules
What type of blood vessel carries blood back to the heart?
A) Arteries
B) Capillaries
C) Veins
D) Aorta
Which blood vessels are responsible for the exchange of oxygen and nutrients with tissues?
A) Arteries
B) Veins
C) Capillaries
D) Aorta
What is the largest artery in the body?
A) Pulmonary artery
B) Aorta
C) Coronary artery
D) Carotid artery
What chamber of the heart receives oxygen-rich blood from the lungs?
A) Right atrium
B) Left atrium
C) Right ventricle
D) Left ventricle
Which component of blood carries oxygen?
A) White blood cells
B) Plasma
C) Red blood cells
D) Platelets
What is the iron-containing protein in red blood cells that binds oxygen?
A) Hemoglobin
B) Myoglobin
C) Fibrinogen
D) Albumin
Which part of the heart pumps oxygen-rich blood to the body?
A) Left atrium
B) Right atrium
C) Left ventricle
D) Right ventricle
Which blood vessel carries oxygen-poor blood from the body to the heart?
A) Aorta
B) Pulmonary vein
C) Superior vena cava
D) Carotid artery
What is the function of white blood cells?
A) Transport oxygen
B) Fight infections
C) Clot blood
D) Maintain blood pressure
Which component of blood helps in clotting?
A) Red blood cells
B) White blood cells
C) Platelets
D) Plasma
What is the normal resting heart rate for an adult?
A) 30-50 bpm
B) 60-100 bpm
C) 120-150 bpm
D) 200-220 bpm
Which valve prevents the backflow of blood into the left atrium?
A) Aortic valve
B) Pulmonary valve
C) Tricuspid valve
D) Mitral valve
What is the smallest type of blood vessel?
A) Vein
B) Artery
C) Capillary
D) Venule
Which part of the circulatory system carries oxygen-poor blood to the lungs?
A) Pulmonary circulation
B) Systemic circulation
C) Coronary circulation
D) Hepatic circulation
What is the main function of plasma in blood?
A) Carry oxygen
B) Transport nutrients and hormones
C) Fight infections
D) Help in clotting
Which heart sound is produced by the closing of the atrioventricular (AV) valves?
A) Lub
B) Dub
C) Murmur
D) Pulse
What is the term for high blood pressure?
A) Hypotension
B) Hypertension
C) Arrhythmia
D) Bradycardia
Which structure connects arteries to veins?
A) Aorta
B) Capillaries
C) Venules
D) Arterioles
What is the main function of the coronary arteries?
A) Pump blood to the lungs
B) Supply blood to the heart muscle
C) Regulate heart rate
D) Transport blood to the brain
Which part of the nervous system controls heart rate?
A) Somatic nervous system
B) Parasympathetic nervous system
C) Central nervous system
D) Endocrine system
Which side of the heart pumps blood to the lungs?
A) Right
B) Left
C) Both
D) Neither
What is the function of the pulmonary veins?
A) Carry oxygen-poor blood to the lungs
B) Carry oxygen-rich blood to the heart
C) Pump blood to the body
D) Prevent backflow of blood
Which heart chamber receives oxygen-poor blood from the body?
A) Left ventricle
B) Left atrium
C) Right atrium
D) Right ventricle
What is the function of the sinoatrial (SA) node?
A) Pumps blood to the lungs
B) Initiates the heartbeat
C) Produces red blood cells
D) Transports oxygen in blood
What is the thickest chamber of the heart?
A) Left ventricle
B) Right atrium
C) Right ventricle
D) Left atrium
Which condition is caused by blocked coronary arteries?
A) Stroke
B) Heart attack
C) Hypertension
D) Anemia
Which molecule in red blood cells carries carbon dioxide back to the lungs?
A) Myoglobin
B) Hemoglobin
C) Fibrinogen
D) Albumin
