#1
Which chamber of the heart receives deoxygenated blood from the body?
Right atrium
ExplanationDeoxygenated blood enters the right atrium before being pumped to the lungs.
#2
What is the primary function of the cardiovascular system?
To deliver oxygen and nutrients to cells
ExplanationThe cardiovascular system transports oxygen and nutrients to body cells for their metabolic needs.
#3
Which of the following is NOT a major type of blood vessel in the body?
Lymphatic vessel
ExplanationLymphatic vessels carry lymph, not blood.
#4
What is the approximate resting heart rate for a healthy adult?
60-80 beats per minute
ExplanationA normal resting heart rate for adults ranges from 60 to 80 beats per minute.
#5
Which blood vessel carries oxygenated blood away from the heart to the body?
Aorta
ExplanationThe aorta distributes oxygenated blood to the body's tissues.
#6
What is the role of valves in the cardiovascular system?
To prevent backflow of blood
ExplanationValves ensure blood flows in one direction, preventing backward flow.
#7
What is the pacemaker of the heart?
Sinoatrial (SA) node
ExplanationThe SA node sets the rhythm and rate of heartbeats.
#8
Which of the following factors can increase blood pressure?
Increased sodium intake
ExplanationHigher sodium intake can lead to fluid retention and elevated blood pressure.
#9
What is the Frank-Starling law of the heart?
It describes the relationship between stroke volume and end-diastolic volume
ExplanationThis law states that the more the heart muscle is stretched during filling, the greater the force of contraction and the greater the quantity of blood pumped into circulation.