ATI TEAS SCIENCE CONCEPTS TEST EXAM REVIEW 2026 WITH 100% ACCURATE
ANSWERS,,....
ATI TEAS Science Concepts Test Exam Review 2026
210 Practice Questions with Answers, Rationales, and Multiple Choice
EXAM OVERVIEW
The ATI TEAS Version 7 Science section contains 50 questions (44 scored + 6
unscored pretest items) to be completed in 60 minutes. The content is distributed
across four major areas :
Content Area Scored Questions Percentage
Human Anatomy & Physiology 18 12%
Biology 9 6%
Chemistry 8 5%
Scientific Reasoning 9 6%
SECTION 1: HUMAN ANATOMY AND PHYSIOLOGY (60 Questions)
Cardiovascular System
1. Blood flows from the right ventricle into which structure?
A. Left atrium
B. Aorta
C. Pulmonary artery
,D. Superior vena cava
Answer: C. The right ventricle pumps deoxygenated blood through the pulmonary
artery to the lungs. The aorta receives oxygenated blood from the left ventricle .
2. Which component of blood is primarily responsible for oxygen transport?
A. Platelets
B. Plasma proteins
C. Hemoglobin in red blood cells
D. White blood cells
Answer: C. Hemoglobin is the iron-containing protein in red blood cells that binds
oxygen in the lungs and releases it to tissues .
3. The sinoatrial (SA) node is located in which structure?
A. Left ventricle
B. Right atrium near the superior vena cava
C. Atrioventricular junction
D. Bundle of His
,Answer: B. The SA node (the heart's natural pacemaker) is in the right atrium. It
fires spontaneously at 60-100 bpm and initiates each cardiac cycle .
4. When the kidneys release renin, the result is:
A. Immediate decrease in blood pressure
B. Direct arterial dilation
C. Aldosterone release leading to increased blood pressure
D. Increased heart rate only
Answer: C. Renin triggers the RAAS cascade: renin converts angiotensinogen to
angiotensin I, which becomes angiotensin II, which stimulates aldosterone.
Aldosterone increases sodium and water retention, raising blood volume and
pressure .
5. Which chamber of the heart has the thickest muscular wall?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
, Answer: D. The left ventricle must generate enough force to pump oxygenated
blood throughout the entire body .
6. What is the primary function of red blood cells (erythrocytes)?
A. Fight infection
B. Transport oxygen
C. Produce hormones
D. Clot blood
Answer: B. Red blood cells contain hemoglobin, which binds to and carries oxygen
from the lungs to body tissues .
7. Which type of blood vessel carries blood away from the heart?
A. Vein
B. Capillary
C. Artery
D. Venule
Answer: C. Arteries carry oxygenated blood away from the heart under high
pressure (with the exception of the pulmonary artery) .
ANSWERS,,....
ATI TEAS Science Concepts Test Exam Review 2026
210 Practice Questions with Answers, Rationales, and Multiple Choice
EXAM OVERVIEW
The ATI TEAS Version 7 Science section contains 50 questions (44 scored + 6
unscored pretest items) to be completed in 60 minutes. The content is distributed
across four major areas :
Content Area Scored Questions Percentage
Human Anatomy & Physiology 18 12%
Biology 9 6%
Chemistry 8 5%
Scientific Reasoning 9 6%
SECTION 1: HUMAN ANATOMY AND PHYSIOLOGY (60 Questions)
Cardiovascular System
1. Blood flows from the right ventricle into which structure?
A. Left atrium
B. Aorta
C. Pulmonary artery
,D. Superior vena cava
Answer: C. The right ventricle pumps deoxygenated blood through the pulmonary
artery to the lungs. The aorta receives oxygenated blood from the left ventricle .
2. Which component of blood is primarily responsible for oxygen transport?
A. Platelets
B. Plasma proteins
C. Hemoglobin in red blood cells
D. White blood cells
Answer: C. Hemoglobin is the iron-containing protein in red blood cells that binds
oxygen in the lungs and releases it to tissues .
3. The sinoatrial (SA) node is located in which structure?
A. Left ventricle
B. Right atrium near the superior vena cava
C. Atrioventricular junction
D. Bundle of His
,Answer: B. The SA node (the heart's natural pacemaker) is in the right atrium. It
fires spontaneously at 60-100 bpm and initiates each cardiac cycle .
4. When the kidneys release renin, the result is:
A. Immediate decrease in blood pressure
B. Direct arterial dilation
C. Aldosterone release leading to increased blood pressure
D. Increased heart rate only
Answer: C. Renin triggers the RAAS cascade: renin converts angiotensinogen to
angiotensin I, which becomes angiotensin II, which stimulates aldosterone.
Aldosterone increases sodium and water retention, raising blood volume and
pressure .
5. Which chamber of the heart has the thickest muscular wall?
A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle
, Answer: D. The left ventricle must generate enough force to pump oxygenated
blood throughout the entire body .
6. What is the primary function of red blood cells (erythrocytes)?
A. Fight infection
B. Transport oxygen
C. Produce hormones
D. Clot blood
Answer: B. Red blood cells contain hemoglobin, which binds to and carries oxygen
from the lungs to body tissues .
7. Which type of blood vessel carries blood away from the heart?
A. Vein
B. Capillary
C. Artery
D. Venule
Answer: C. Arteries carry oxygenated blood away from the heart under high
pressure (with the exception of the pulmonary artery) .
