Arizona Certified Nursing Assistant (CNA) Practice Test

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Study for the Arizona Certified Nursing Assistant Test. Utilize flashcards and multiple choice questions with hints and explanations. Prepare thoroughly for your exam!

Practice this question and more.

The heart is a crucial muscle that is part of which body system?

Digestive system
Respiratory system
Excretory system
Circulatory system

The correct answer is: Circulatory system

The heart is a vital organ in the body and serves as the central component of the circulatory system. This system is responsible for the transportation of blood, nutrients, oxygen, carbon dioxide, and hormones throughout the body. The heart pumps blood into a network of blood vessels, allowing for efficient circulation that supports cellular function and overall homeostasis. In contrast, the digestive system primarily deals with the intake and processing of food to extract nutrients, the respiratory system focuses on the exchange of gases (oxygen and carbon dioxide) between the body and the environment, and the excretory system is responsible for the removal of waste products from the body. Each of these systems plays distinct roles, but it is the circulatory system that directly involves the heart in its function of maintaining blood flow and supporting life.