ATI TEAS 7 Science Exam Questions and Answers —
Practice Questions with Answers Comprehensive
150-Question Practice Bank for Nursing School
Entrance Excellence
Table of Contents
Question
Section Topic Area
Numbers
I Human Anatomy & Physiology — Cardiovascular System 1–15
II Human Anatomy & Physiology — Respiratory System 16–25
III Human Anatomy & Physiology — Digestive System 26–35
IV Human Anatomy & Physiology — Nervous System 36–45
V Human Anatomy & Physiology — Renal/Urinary System 46–53
VI Human Anatomy & Physiology — Endocrine System 54–62
VII Human Anatomy & Physiology — Reproductive System 63–68
Human Anatomy & Physiology — Integumentary &
VIII 69–76
Musculoskeletal
IX Biology — Cell Structure & Function 77–88
, Question
Section Topic Area
Numbers
X Biology — Genetics & DNA/RNA 89–102
XI Biology — Cellular Respiration & Metabolism 103–110
XII Biology — Immune System & Microbiology 111–118
XIII Chemistry — Atomic Structure & Periodic Table 119–128
XIV Chemistry — Chemical Bonds & Reactions 129–137
XV Chemistry — Solutions, pH, & Properties of Matter 138–144
XVI Scientific Reasoning — Scientific Method & Data Analysis 145–150
SECTION I: HUMAN ANATOMY & PHYSIOLOGY — CARDIOVASCULAR SYSTEM
• 1. Which chamber of the heart receives deoxygenated blood from the superior and inferior
vena cavae?
• A) Left atrium
• B) Left ventricle
• C) Right ventricle
• D) Right atrium
Rationale: The right atrium receives deoxygenated blood from the systemic circulation via the
superior and inferior vena cavae. Blood then flows to the right ventricle, which pumps it to the
lungs for oxygenation.
• 2. Which of the following correctly describes the function of the sinoatrial (SA) node?
• A) It delays electrical impulses to allow complete ventricular filling
, • B) It generates electrical impulses that initiate each heartbeat
• C) It conducts impulses directly to the Purkinje fibers
• D) It regulates blood pressure through baroreceptor reflexes
Rationale: The sinoatrial (SA) node is the heart's natural pacemaker, located in the right atrial
wall. It generates electrical impulses that initiate each heartbeat and set the rhythm for the
entire cardiac cycle.
• 3. Blood flowing through the pulmonary veins is best described as:
• A) Oxygenated blood returning to the left atrium
• B) Deoxygenated blood returning to the right atrium
• C) Oxygenated blood leaving the left ventricle
• D) Deoxygenated blood leaving the right ventricle
Rationale: The pulmonary veins carry oxygenated blood from the lungs back to the left
atrium. This is unique among veins, as most veins carry deoxygenated blood.
• 4. Which of the following structures prevents blood from flowing backward from the left
ventricle into the left atrium?
• A) Tricuspid valve
• B) Pulmonary semilunar valve
• C) Mitral (bicuspid) valve
• D) Aortic semilunar valve
Rationale: The mitral (bicuspid) valve is located between the left atrium and left ventricle. It
prevents backflow of blood into the left atrium when the left ventricle contracts.
• 5. A patient has a blockage in the renal artery. Which of the following would most likely
result?
• A) Increased urine output
• B) Decreased blood flow to the kidney
• C) Increased blood pressure in the renal vein
• D) Decreased renin secretion
, Rationale: The renal artery supplies oxygenated blood to the kidneys. A blockage would
reduce renal blood flow, potentially activating the renin-angiotensin-aldosterone system to
increase blood pressure.
• 6. Which of the following blood components is primarily responsible for blood clotting?
• A) Platelets (thrombocytes)
• B) Erythrocytes
• C) Leukocytes
• D) Plasma proteins
Rationale: Platelets (thrombocytes) are cell fragments that play a crucial role in hemostasis by
aggregating at sites of vascular injury and forming platelet plugs to initiate clotting.
• 7. Which blood type is considered the universal donor?
• A) Type A
• B) Type B
• C) Type AB
• D) Type O
Rationale: Type O blood lacks A and B antigens on the surface of red blood cells, making it
compatible with all other blood types in transfusion. Type O negative is the universal donor.
• 8. Which of the following correctly traces the path of blood flow through the heart starting
from the right atrium?
• A) Right atrium → right ventricle → lungs → left atrium → left ventricle → body
• B) Right atrium → right ventricle → pulmonary artery → lungs →
pulmonary veins → left atrium → left ventricle → aorta
• C) Right atrium → left atrium → left ventricle → lungs → right ventricle → aorta
• D) Right atrium → pulmonary artery → lungs → left ventricle → body
Rationale: The correct pathway is: right atrium → right ventricle → pulmonary artery → lungs
(gas exchange) → pulmonary veins → left atrium → left ventricle → aorta → systemic
circulation.
Practice Questions with Answers Comprehensive
150-Question Practice Bank for Nursing School
Entrance Excellence
Table of Contents
Question
Section Topic Area
Numbers
I Human Anatomy & Physiology — Cardiovascular System 1–15
II Human Anatomy & Physiology — Respiratory System 16–25
III Human Anatomy & Physiology — Digestive System 26–35
IV Human Anatomy & Physiology — Nervous System 36–45
V Human Anatomy & Physiology — Renal/Urinary System 46–53
VI Human Anatomy & Physiology — Endocrine System 54–62
VII Human Anatomy & Physiology — Reproductive System 63–68
Human Anatomy & Physiology — Integumentary &
VIII 69–76
Musculoskeletal
IX Biology — Cell Structure & Function 77–88
, Question
Section Topic Area
Numbers
X Biology — Genetics & DNA/RNA 89–102
XI Biology — Cellular Respiration & Metabolism 103–110
XII Biology — Immune System & Microbiology 111–118
XIII Chemistry — Atomic Structure & Periodic Table 119–128
XIV Chemistry — Chemical Bonds & Reactions 129–137
XV Chemistry — Solutions, pH, & Properties of Matter 138–144
XVI Scientific Reasoning — Scientific Method & Data Analysis 145–150
SECTION I: HUMAN ANATOMY & PHYSIOLOGY — CARDIOVASCULAR SYSTEM
• 1. Which chamber of the heart receives deoxygenated blood from the superior and inferior
vena cavae?
• A) Left atrium
• B) Left ventricle
• C) Right ventricle
• D) Right atrium
Rationale: The right atrium receives deoxygenated blood from the systemic circulation via the
superior and inferior vena cavae. Blood then flows to the right ventricle, which pumps it to the
lungs for oxygenation.
• 2. Which of the following correctly describes the function of the sinoatrial (SA) node?
• A) It delays electrical impulses to allow complete ventricular filling
, • B) It generates electrical impulses that initiate each heartbeat
• C) It conducts impulses directly to the Purkinje fibers
• D) It regulates blood pressure through baroreceptor reflexes
Rationale: The sinoatrial (SA) node is the heart's natural pacemaker, located in the right atrial
wall. It generates electrical impulses that initiate each heartbeat and set the rhythm for the
entire cardiac cycle.
• 3. Blood flowing through the pulmonary veins is best described as:
• A) Oxygenated blood returning to the left atrium
• B) Deoxygenated blood returning to the right atrium
• C) Oxygenated blood leaving the left ventricle
• D) Deoxygenated blood leaving the right ventricle
Rationale: The pulmonary veins carry oxygenated blood from the lungs back to the left
atrium. This is unique among veins, as most veins carry deoxygenated blood.
• 4. Which of the following structures prevents blood from flowing backward from the left
ventricle into the left atrium?
• A) Tricuspid valve
• B) Pulmonary semilunar valve
• C) Mitral (bicuspid) valve
• D) Aortic semilunar valve
Rationale: The mitral (bicuspid) valve is located between the left atrium and left ventricle. It
prevents backflow of blood into the left atrium when the left ventricle contracts.
• 5. A patient has a blockage in the renal artery. Which of the following would most likely
result?
• A) Increased urine output
• B) Decreased blood flow to the kidney
• C) Increased blood pressure in the renal vein
• D) Decreased renin secretion
, Rationale: The renal artery supplies oxygenated blood to the kidneys. A blockage would
reduce renal blood flow, potentially activating the renin-angiotensin-aldosterone system to
increase blood pressure.
• 6. Which of the following blood components is primarily responsible for blood clotting?
• A) Platelets (thrombocytes)
• B) Erythrocytes
• C) Leukocytes
• D) Plasma proteins
Rationale: Platelets (thrombocytes) are cell fragments that play a crucial role in hemostasis by
aggregating at sites of vascular injury and forming platelet plugs to initiate clotting.
• 7. Which blood type is considered the universal donor?
• A) Type A
• B) Type B
• C) Type AB
• D) Type O
Rationale: Type O blood lacks A and B antigens on the surface of red blood cells, making it
compatible with all other blood types in transfusion. Type O negative is the universal donor.
• 8. Which of the following correctly traces the path of blood flow through the heart starting
from the right atrium?
• A) Right atrium → right ventricle → lungs → left atrium → left ventricle → body
• B) Right atrium → right ventricle → pulmonary artery → lungs →
pulmonary veins → left atrium → left ventricle → aorta
• C) Right atrium → left atrium → left ventricle → lungs → right ventricle → aorta
• D) Right atrium → pulmonary artery → lungs → left ventricle → body
Rationale: The correct pathway is: right atrium → right ventricle → pulmonary artery → lungs
(gas exchange) → pulmonary veins → left atrium → left ventricle → aorta → systemic
circulation.
