Chapter Exam

Unit 2A: Body Fluids and Circulation — Online MCQ Test

Q: What is the liquid part of blood called?

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.

Q: Which blood cells are mainly responsible for blood clotting?

Answer: C. Platelets — Platelets, also called thrombocytes, help in blood clot formation at the site of injury. They release factors that initiate coagulation.

Q: Which part of the heart receives oxygenated blood from the lungs?

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.

Q: During ventricular systole, which event occurs first?

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.

Q: A person has a heart rate of 72 beats/min and a stroke volume of 70 mL/beat. What is the cardiac output?

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.

ZOOLOGY · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Unit 2A: Body Fluids and Circulation with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR ZOOLOGY. 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.

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Unit 2A: Body Fluids and Circulation — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR ZOOLOGY — Unit 2A: Body Fluids and Circulation, with answers and explanations. These are sample questions; the exam has its own separate question set.

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.

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.

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.

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.

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.

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