Question 1

Which of the following organs is responsible for pumping oxygenated blood to all parts of the body?

Accepted Answer

The heart is the central organ of the circulatory system that pumps oxygenated blood received from the lungs to the entire body.

Question 2

How many chambers does a human heart have?

Accepted Answer

The human heart has 4 chambers: two atria (upper) and two ventricles (lower), which work together to pump blood efficiently.

Question 3

Which part of the nervous system controls involuntary actions such as heartbeat and digestion?

Accepted Answer

The autonomic nervous system controls involuntary body functions like heartbeat, breathing, and digestion without conscious effort.

Question 4

Which gland in the human body secretes insulin to regulate blood glucose levels?

Accepted Answer

The pancreas is an endocrine gland that secretes insulin, a hormone essential for regulating and lowering blood glucose levels.

Question 5

Which of the following is the primary function of the pancreas in the human body?

Accepted Answer

The pancreas secretes insulin and glucagon as hormones to regulate blood glucose levels.

Question 6

How many chambers does a human heart have, and what is their basic function?

Accepted Answer

The human heart has 4 chambers—two atria receive blood and two ventricles pump blood to the lungs and body.

Question 7

Which of the following best describes the role of the diaphragm in the respiratory system?

Accepted Answer

The diaphragm is a muscle below the lungs that contracts during inhalation and relaxes during exhalation to enable breathing.

Question 8

In the human digestive system, which organ is responsible for the absorption of water and formation of feces?

Accepted Answer

The large intestine absorbs water and minerals from undigested food and forms feces for elimination.

Question 9

What is the main structural and functional unit of the nervous system that transmits signals throughout the body?

Accepted Answer

A neuron is the basic structural and functional unit of the nervous system responsible for transmitting electrical and chemical signals.

Question 10

Which of the following statements correctly describes the role of the pancreas in the human digestive system?

Accepted Answer

The pancreas has dual roles: it secretes pancreatic juice containing enzymes for digestion and produces insulin and glucagon for blood glucose regulation.

Question 11

In the human circulatory system, the average number of red blood cells in one cubic millimeter of blood is approximately:

Accepted Answer

The normal RBC count in healthy adults ranges from 4.5 to 5.5 million cells per cubic millimeter of blood; lower counts indicate anemia.

Question 12

Which structure in the human nervous system acts as the main control center that coordinates all voluntary and involuntary body functions?

Accepted Answer

The brain is the central command center of the nervous system that receives sensory information, processes it, and sends motor signals to control all body functions.

Agniveer Army Clerk SKT Human Body Systems

Human Body Systems — Practice Questions