Unit 2A: Body Fluids and Circulation — Online MCQ Test
ZOOLOGY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board
Practice Unit 2A: Body Fluids and Circulation with a free chapter-wise online MCQ test.
This chapter covers: This chapter covers blood composition coagulation human heart anatomy cardiac cycle double circulation ECG cardiac output regulation and cardiovascular system disorders..
AI-generated questions from basic to board-exam level, with instant results and explanations.
Unit 2A: Body Fluids and Circulation — Important Questions & Answers
What is the liquid part of blood called?
- A. Plasma
- B. Lymph
- C. Serum
- D. Platelets
Answer: A. Plasma
Plasma is the pale yellow liquid component of blood in which blood cells are suspended. It contains water, proteins, salts, nutrients, and hormones.
Plasma is the pale yellow liquid component of blood in which blood cells are suspended. It contains water, proteins, salts, nutrients, and hormones.
Which blood cells are mainly responsible for blood clotting?
- A. RBCs
- B. WBCs
- C. Platelets
- D. Lymphocytes
Answer: C. Platelets
Platelets, also called thrombocytes, help in blood clot formation at the site of injury. They release factors that initiate coagulation.
Platelets, also called thrombocytes, help in blood clot formation at the site of injury. They release factors that initiate coagulation.
Which part of the heart receives oxygenated blood from the lungs?
- A. Right atrium
- B. Left atrium
- C. Right ventricle
- D. Left ventricle
Answer: B. Left atrium
Oxygenated blood from the lungs enters the left atrium through the pulmonary veins. From there it moves to the left ventricle.
Oxygenated blood from the lungs enters the left atrium through the pulmonary veins. From there it moves to the left ventricle.
During ventricular systole, which event occurs first?
- A. Closure of atrioventricular valves
- B. Opening of semilunar valves
- C. Filling of atria with blood
- D. Relaxation of ventricles
Answer: A. Closure of atrioventricular valves
As ventricular pressure rises, the atrioventricular valves close first to prevent backflow into the atria. Semilunar valves open only after ventricular pressure exceeds arterial pressure.
As ventricular pressure rises, the atrioventricular valves close first to prevent backflow into the atria. Semilunar valves open only after ventricular pressure exceeds arterial pressure.
A person has a heart rate of 72 beats/min and a stroke volume of 70 mL/beat. What is the cardiac output?
- A. 5040 mL/min
- B. 980 mL/min
- C. 142 mL/min
- D. 4900 mL/min
Answer: A. 5040 mL/min
Cardiac output = heart rate × stroke volume = 72 × 70 = 5040 mL/min. This is the volume of blood pumped by one ventricle per minute.
Cardiac output = heart rate × stroke volume = 72 × 70 = 5040 mL/min. This is the volume of blood pumped by one ventricle per minute.