PSB-PN Anatomy & Physiology 3

Question 1

Which body system is primarily responsible for defending the body against pathogens and foreign substances?

Accepted Answer

Immune system

Answer

The immune system, through white blood cells, antibodies, and lymphatic tissues, identifies and destroys pathogens, foreign cells, and abnormal cells.

Question 2

The trachea is a component of which body system?

Accepted Answer

Respiratory system

Answer

The trachea (windpipe) is a cartilaginous tube in the respiratory system that conducts air from the larynx to the bronchi and into the lungs.

Question 3

Insulin, which regulates blood glucose levels, is secreted by which organ?

Accepted Answer

Pancreas

Answer

Insulin is produced by the beta cells of the islets of Langerhans within the pancreas and facilitates cellular uptake of glucose to lower blood sugar.

Question 4

How many bones does the average adult human skeleton contain?

Accepted Answer

206

Answer

The adult human skeleton consists of 206 bones; infants begin with about 270–300 bones, many of which fuse together during childhood and adolescence.

Question 5

Which type of muscle tissue is found exclusively in the heart?

Accepted Answer

Cardiac muscle

Answer

Cardiac muscle is involuntary, striated muscle found only in the myocardium; it contracts rhythmically and continuously without fatigue under normal conditions.

PSB-PN Exam Practice Test

PSB-PN Exam Practice Test

PSB-PN Anatomy & Physiology 3