ATI TEAS 7 Exam Questions and Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. A nurse is teaching a client about the cardiovascular system.
Which chamber of the heart pumps oxygenated blood to the
body?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Rationale: The left ventricle is responsible for pumping oxygen-rich
blood through the aorta to the systemic circulation. It has the thickest
muscular wall because it generates enough pressure to distribute
blood throughout the entire body. The right ventricle pumps blood
only to the lungs, while the atria primarily receive blood.
2. Which organ is primarily responsible for filtering blood and
producing urine?
,A. Liver
B. Pancreas
C. Kidneys
D. Spleen
Rationale: The kidneys continuously filter waste products, excess
water, and electrolytes from the blood to form urine. They also
regulate blood pressure, electrolyte balance, acid-base balance, and
stimulate red blood cell production through erythropoietin.
3. Which level of biological organization is composed of similar cells
performing a common function?
A. Organism
B. Organ
C. Tissue
D. Organ system
Rationale: A tissue consists of similar cells working together to
perform a specific function. Groups of tissues form organs, organs
work together in organ systems, and organ systems collectively make
up an organism.
, 4. Which blood vessel carries oxygenated blood from the lungs to
the heart?
A. Pulmonary artery
B. Pulmonary vein
C. Superior vena cava
D. Inferior vena cava
Rationale: The pulmonary veins are unique because they carry
oxygen-rich blood from the lungs to the left atrium. In contrast,
pulmonary arteries carry oxygen-poor blood from the heart to the
lungs.
5. Which type of muscle is found only in the heart?
A. Smooth muscle
B. Skeletal muscle
C. Cardiac muscle
D. Voluntary muscle
Rationale: Cardiac muscle is found exclusively in the heart. It is
involuntary, striated, and capable of contracting rhythmically without
conscious control due to specialized pacemaker cells.
, 6. Which structure is responsible for gas exchange in the lungs?
A. Bronchi
B. Bronchioles
C. Alveoli
D. Trachea
Rationale: Alveoli are microscopic air sacs where oxygen diffuses into
the bloodstream and carbon dioxide diffuses out. Their thin walls and
extensive capillary network maximize gas exchange efficiency.
7. Which vitamin is primarily synthesized when skin is exposed to
sunlight?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K
Rationale: Ultraviolet B radiation stimulates the skin to produce
vitamin D, which is essential for calcium absorption and bone health.
Deficiency can contribute to weakened bones and impaired immune
function.
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. A nurse is teaching a client about the cardiovascular system.
Which chamber of the heart pumps oxygenated blood to the
body?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
Rationale: The left ventricle is responsible for pumping oxygen-rich
blood through the aorta to the systemic circulation. It has the thickest
muscular wall because it generates enough pressure to distribute
blood throughout the entire body. The right ventricle pumps blood
only to the lungs, while the atria primarily receive blood.
2. Which organ is primarily responsible for filtering blood and
producing urine?
,A. Liver
B. Pancreas
C. Kidneys
D. Spleen
Rationale: The kidneys continuously filter waste products, excess
water, and electrolytes from the blood to form urine. They also
regulate blood pressure, electrolyte balance, acid-base balance, and
stimulate red blood cell production through erythropoietin.
3. Which level of biological organization is composed of similar cells
performing a common function?
A. Organism
B. Organ
C. Tissue
D. Organ system
Rationale: A tissue consists of similar cells working together to
perform a specific function. Groups of tissues form organs, organs
work together in organ systems, and organ systems collectively make
up an organism.
, 4. Which blood vessel carries oxygenated blood from the lungs to
the heart?
A. Pulmonary artery
B. Pulmonary vein
C. Superior vena cava
D. Inferior vena cava
Rationale: The pulmonary veins are unique because they carry
oxygen-rich blood from the lungs to the left atrium. In contrast,
pulmonary arteries carry oxygen-poor blood from the heart to the
lungs.
5. Which type of muscle is found only in the heart?
A. Smooth muscle
B. Skeletal muscle
C. Cardiac muscle
D. Voluntary muscle
Rationale: Cardiac muscle is found exclusively in the heart. It is
involuntary, striated, and capable of contracting rhythmically without
conscious control due to specialized pacemaker cells.
, 6. Which structure is responsible for gas exchange in the lungs?
A. Bronchi
B. Bronchioles
C. Alveoli
D. Trachea
Rationale: Alveoli are microscopic air sacs where oxygen diffuses into
the bloodstream and carbon dioxide diffuses out. Their thin walls and
extensive capillary network maximize gas exchange efficiency.
7. Which vitamin is primarily synthesized when skin is exposed to
sunlight?
A. Vitamin A
B. Vitamin C
C. Vitamin D
D. Vitamin K
Rationale: Ultraviolet B radiation stimulates the skin to produce
vitamin D, which is essential for calcium absorption and bone health.
Deficiency can contribute to weakened bones and impaired immune
function.
