Circulatory System and Heart
Q. What is the function of red blood cells?
-
A.
To fight infections
-
B.
To transport oxygen
-
C.
To clot blood
-
D.
To regulate body temperature
Solution
Red blood cells transport oxygen from the lungs to the body's tissues and return carbon dioxide to the lungs.
Correct Answer: B — To transport oxygen
Q. What is the largest artery in the human body?
-
A.
Pulmonary artery
-
B.
Aorta
-
C.
Coronary artery
-
D.
Femoral artery
Solution
The aorta is the largest artery in the human body, carrying oxygenated blood from the heart to the rest of the body.
Correct Answer: B — Aorta
Q. What is the primary function of the circulatory system?
-
A.
To digest food
-
B.
To transport nutrients and oxygen
-
C.
To regulate body temperature
-
D.
To produce hormones
Solution
The primary function of the circulatory system is to transport nutrients and oxygen to cells and remove waste products.
Correct Answer: B — To transport nutrients and oxygen
Q. What is the primary pacemaker of the heart?
-
A.
Atrioventricular node
-
B.
Bundle of His
-
C.
Sinoatrial node
-
D.
Purkinje fibers
Solution
The sinoatrial (SA) node is the primary pacemaker of the heart, initiating the heartbeat.
Correct Answer: C — Sinoatrial node
Q. What is the role of the valves in the heart?
-
A.
To increase blood pressure
-
B.
To prevent backflow of blood
-
C.
To oxygenate blood
-
D.
To regulate heart rate
Solution
The valves in the heart prevent the backflow of blood, ensuring it flows in one direction.
Correct Answer: B — To prevent backflow of blood
Q. What is the term for the contraction phase of the heart cycle?
-
A.
Diastole
-
B.
Systole
-
C.
Arrhythmia
-
D.
Fibrillation
Solution
Systole is the contraction phase of the heart cycle, during which the heart pumps blood.
Correct Answer: B — Systole
Q. Which chamber of the heart receives deoxygenated blood from the body?
-
A.
Left atrium
-
B.
Right atrium
-
C.
Left ventricle
-
D.
Right ventricle
Solution
The right atrium receives deoxygenated blood from the body through the superior and inferior vena cavae.
Correct Answer: B — Right atrium
Q. Which circulatory system is found in mammals?
-
A.
Open circulatory system
-
B.
Closed circulatory system
-
C.
Lymphatic system
-
D.
Pulmonary system
Solution
Mammals have a closed circulatory system, where blood is contained within vessels.
Correct Answer: B — Closed circulatory system
Q. Which part of the heart is responsible for pumping oxygenated blood to the body?
-
A.
Right atrium
-
B.
Left atrium
-
C.
Right ventricle
-
D.
Left ventricle
Solution
The left ventricle is responsible for pumping oxygenated blood to the body.
Correct Answer: D — Left ventricle
Q. Which type of blood vessel carries blood away from the heart?
-
A.
Veins
-
B.
Capillaries
-
C.
Arteries
-
D.
Venules
Solution
Arteries are the blood vessels that carry blood away from the heart.
Correct Answer: C — Arteries
Showing 1 to 10 of 10 (1 Pages)
