Free PSB-RN Natural Sciences (Biology, Chemistry & Physics) Questions and Answers

Question 1

Which organelle is responsible for ATP production in human cells?

Accepted Answer

Mitochondria

Answer

Mitochondria are often referred to as the 'powerhouses' of the cell because they are the primary sites of cellular respiration. During this process, glucose and oxygen are converted into adenosine triphosphate (ATP), which is the main energy currency used by the cell for various functions.

Question 2

What is the normal pH range of human blood?

Accepted Answer

7.35-7.45

Answer

The normal pH range of human blood is tightly regulated between 7.35 and 7.45, making it slightly alkaline. Maintaining this narrow range is crucial for proper physiological function, as deviations can lead to serious health complications like acidosis or alkalosis.

Question 3

Which law explains why intravenous fluids must be administered at specific heights?

Accepted Answer

Gravity and Hydrostatic Pressure

Answer

Intravenous fluids are administered using gravity to create hydrostatic pressure, which drives the fluid into the patient's vein. The height of the IV bag above the patient determines the amount of gravitational force and thus the pressure, influencing the flow rate of the fluid.

Question 4

What type of chemical bond holds water molecules together?

Accepted Answer

Hydrogen bonds

Answer

Water molecules are polar, meaning they have a slight positive charge on the hydrogen atoms and a slight negative charge on the oxygen atom. This polarity allows hydrogen bonds to form between the hydrogen of one water molecule and the oxygen of an adjacent water molecule, giving water its unique properties.

Question 5

Which blood vessels carry oxygenated blood from the lungs to the heart?

Accepted Answer

Pulmonary veins

Answer

In the circulatory system, pulmonary veins are responsible for carrying oxygenated blood from the lungs back to the left atrium of the heart. Pulmonary arteries, conversely, carry deoxygenated blood from the heart to the lungs.

PSB-RN - Registered Nursing Exam Practice Test

PSB-RN - Registered Nursing Exam Practice Test

Free PSB-RN Natural Sciences (Biology, Chemistry & Physics) Questions and Answers