🫀 10th Class Biology
Chapter 2: Circulatory System (FBISE)
Solved MCQs
1. The heart's upper chambers are called:
- A) ventricles
- ✅ B) atria
- C) valves
- D) arteries
Explanation: Atria are the top chambers that receive blood entering the heart.
2. Blood components that help the body to control bleeding are:
- ✅ A) platelets
- B) red blood cells
- C) white blood cells
- D) haemoglobin
Explanation: Platelets help stop bleeding by forming blood clots.
3. Bicuspid valve connects:
- A) left atrium and right atrium
- B) left atrium and right ventricle
- C) right atrium and left ventricle
- ✅ D) left atrium and left ventricle
Explanation: The bicuspid (mitral) valve connects the left atrium to the left ventricle.
4. Which of the following chambers has the thickest walls in human heart?
- A) left atrium
- B) right atrium
- ✅ C) left ventricle
- D) right ventricle
Explanation: The left ventricle has thick walls to pump blood with high pressure to the entire body.
5. The left half of the human heart:
- A) has deoxygenated blood
- ✅ B) has oxygenated blood
- C) pumps blood to the lungs
- D) passes blood through the right ventricle
Explanation: The left side of the heart contains oxygen-rich blood from the lungs.
6. The pulmonary arteries carry blood to the:
- A) brain
- B) heart
- C) liver
- ✅ D) lungs
Explanation: Pulmonary arteries carry deoxygenated blood from the heart to the lungs for oxygenation.
7. Which one of the following helps to fight germs?
- A) Red blood cells
- ✅ B) White blood cells
- C) Platelets
- D) Plasma
Explanation: White blood cells protect the body by attacking harmful bacteria and viruses.
8. The blood vessels that carry blood from heart to the various parts of the body are called:
- A) septum
- ✅ B) arteries
- C) veins
- D) capillaries
Explanation: Arteries carry blood away from the heart to different parts of the body.
9. Which one of the following is a double membrane sac that covers the human heart?
- A) epicardium
- ✅ B) pericardium
- C) myocardium
- D) endocardium
Explanation: The pericardium surrounds and protects the heart with two layers.
10. The alternating expansion and relaxation of the artery that you feel in your wrist is the:
- ✅ A) pulse
- B) coronary artery
- C) blood pressure
- D) plasma
Explanation: The pulse is the rhythmic throbbing felt as blood moves through arteries.
11. Nutrients are exchanged between the blood and body cells in the:
- A) arteries
- ✅ B) capillaries
- C) veins
- D) aorta
Explanation: Capillaries are tiny blood vessels where nutrient and gas exchange occurs.
12. Which is the largest artery in the human body?
- A) pulmonary artery
- ✅ B) aorta
- C) common iliac artery
- D) femoral artery
Explanation: The aorta is the main and largest artery that distributes blood from the heart to the body.
13. What is the valve in the opening between the right atrium and the right ventricle called?
- A) pulmonary valve
- B) aortic valve
- ✅ C) tricuspid valve
- D) bicuspid valve
Explanation: The tricuspid valve is located between the right atrium and the right ventricle.
14. Human heart is:
- ✅ A) myogenic
- B) neurogenic
- C) cardiogenic
- D) digenic
Explanation: A myogenic heart can initiate its own contractions without neural signals.
15. Pacemaker is situated in heart:
- ✅ A) in the wall of right atrium
- B) on interauricular septum
- C) on interventricular septum
- D) in the wall of the left atrium
Explanation: The sinoatrial (SA) node, the heart’s pacemaker, lies in the right atrial wall.
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