CNA Anatomy and Physiology Basics

Question 1

Which body system is responsible for transporting oxygen and nutrients to cells throughout the body?

Accepted Answer

Cardiovascular system

Answer

The cardiovascular system, consisting of the heart and blood vessels, pumps blood that carries oxygen and nutrients to every cell in the body and removes waste products.

Question 2

What is the largest organ of the human body?

Accepted Answer

Skin

Answer

The skin is the largest organ of the body, covering the entire external surface and serving as a protective barrier against infection, temperature regulation, and sensation.

Question 3

Which of the following is a function of the skeletal system?

Accepted Answer

Protecting internal organs

Answer

The skeletal system protects vital internal organs — for example, the skull protects the brain, and the rib cage shields the heart and lungs — while also providing structure and enabling movement.

Question 4

The process by which the body breaks down food into nutrients that can be absorbed into the bloodstream is called:

Accepted Answer

Digestion

Answer

Digestion is the process of mechanically and chemically breaking down food into smaller molecules — such as glucose, amino acids, and fatty acids — that can be absorbed by the intestines and transported through the blood.

Question 5

Which organ is responsible for filtering waste products from the blood and producing urine?

Accepted Answer

Kidney

Answer

The kidneys filter approximately 200 liters of blood per day, removing waste products and excess water to produce urine, which is then excreted from the body through the urinary tract.

CNA Practice Test

CNA Practice Test

CNA Anatomy and Physiology Basics