Biology STAAR (State of Texas Assessments of Academic Readiness) Practice Test

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Study for the Biology STAAR Test. Improve your skills with flashcards and multiple choice questions, each question is accompanied by hints and explanations. Prepare for success!

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Which system is responsible for gas exchange in the body?

Digestive system
Respiratory system
Muscular system
Skeletal system

The correct answer is: Respiratory system

The respiratory system is responsible for gas exchange in the body because it facilitates the movement of oxygen into the bloodstream and the removal of carbon dioxide from the bloodstream. This process occurs primarily in the lungs, where the alveoli—tiny air sacs—allow for the diffusion of gases due to the differences in concentration between the air in the lungs and the blood in the capillaries surrounding them. As air is inhaled, oxygen is taken into the lungs, and through the thin walls of the alveoli, it enters the blood. At the same time, carbon dioxide, which is a waste product of metabolism produced by the cells, diffuses from the blood into the alveoli to be exhaled. The effectiveness of this system is essential for maintaining the body’s pH balance and overall cellular function. In comparison, the digestive system is primarily involved in breaking down food and absorbing nutrients, the muscular system is involved with movement and support of the body, and the skeletal system provides structure and protection for vital organs, but none are directly responsible for gas exchange.