ATI TEAS Science practice Exam, Questions
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Rationales 2025/2026 Q&A | Instant
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1. Which of the following is the primary function of red blood cells?
A) Fight infections
B) Clot blood
C) Transport oxygen
D) Produce hormones
Red blood cells contain hemoglobin, which binds and carries oxygen to tissues.
2. Which organ is primarily responsible for filtering blood and producing
urine?
A) Liver
B) Heart
C) Kidney
D) Pancreas
The kidneys filter waste and excess substances from the blood to form urine.
3. The process by which plants convert sunlight into chemical energy is
called:
A) Respiration
B) Photosynthesis
C) Transpiration
D) Fermentation
Photosynthesis converts light energy into chemical energy stored in glucose.
4. Which structure in the cell contains the genetic material?
,A) Mitochondria
B) Ribosome
C) Nucleus
D) Endoplasmic reticulum
The nucleus houses DNA, which controls cell function and reproduction.
5. Which type of joint allows the widest range of motion?
A) Hinge
B) Pivot
C) Gliding
D) Ball-and-socket
Ball-and-socket joints, such as the shoulder and hip, allow rotation and
movement in multiple directions.
6. What is the main purpose of platelets in the blood?
A) Carry oxygen
B) Aid in clotting
C) Fight infection
D) Produce hormones
Platelets help form clots to prevent excessive bleeding.
7. Which organ produces insulin?
A) Liver
B) Stomach
C) Pancreas
D) Gallbladder
Insulin, a hormone that regulates blood sugar, is secreted by the pancreas.
8. What is the largest organ in the human body?
, A) Heart
B) Liver
C) Skin
D) Lung
The skin protects internal structures and regulates temperature.
9. Which type of blood vessel carries blood away from the heart?
A) Arteries
B) Veins
C) Capillaries
D) Lymphatics
Arteries transport oxygenated blood from the heart to tissues.
10. Which macromolecule serves as the main source of energy for the body?
A) Lipids
B) Carbohydrates
C) Proteins
D) Nucleic acids
Carbohydrates are broken down into glucose, the body’s primary energy
source.
11. During inhalation, the diaphragm:
A) Moves upward
B) Moves downward
C) Stays stationary
D) Contracts only on one side
When the diaphragm contracts and moves downward, lung volume increases,
drawing in air.
12. Which part of the brain controls balance and coordination?
And Correct Answers (Verified Answers) Plus
Rationales 2025/2026 Q&A | Instant
Download Pdf
1. Which of the following is the primary function of red blood cells?
A) Fight infections
B) Clot blood
C) Transport oxygen
D) Produce hormones
Red blood cells contain hemoglobin, which binds and carries oxygen to tissues.
2. Which organ is primarily responsible for filtering blood and producing
urine?
A) Liver
B) Heart
C) Kidney
D) Pancreas
The kidneys filter waste and excess substances from the blood to form urine.
3. The process by which plants convert sunlight into chemical energy is
called:
A) Respiration
B) Photosynthesis
C) Transpiration
D) Fermentation
Photosynthesis converts light energy into chemical energy stored in glucose.
4. Which structure in the cell contains the genetic material?
,A) Mitochondria
B) Ribosome
C) Nucleus
D) Endoplasmic reticulum
The nucleus houses DNA, which controls cell function and reproduction.
5. Which type of joint allows the widest range of motion?
A) Hinge
B) Pivot
C) Gliding
D) Ball-and-socket
Ball-and-socket joints, such as the shoulder and hip, allow rotation and
movement in multiple directions.
6. What is the main purpose of platelets in the blood?
A) Carry oxygen
B) Aid in clotting
C) Fight infection
D) Produce hormones
Platelets help form clots to prevent excessive bleeding.
7. Which organ produces insulin?
A) Liver
B) Stomach
C) Pancreas
D) Gallbladder
Insulin, a hormone that regulates blood sugar, is secreted by the pancreas.
8. What is the largest organ in the human body?
, A) Heart
B) Liver
C) Skin
D) Lung
The skin protects internal structures and regulates temperature.
9. Which type of blood vessel carries blood away from the heart?
A) Arteries
B) Veins
C) Capillaries
D) Lymphatics
Arteries transport oxygenated blood from the heart to tissues.
10. Which macromolecule serves as the main source of energy for the body?
A) Lipids
B) Carbohydrates
C) Proteins
D) Nucleic acids
Carbohydrates are broken down into glucose, the body’s primary energy
source.
11. During inhalation, the diaphragm:
A) Moves upward
B) Moves downward
C) Stays stationary
D) Contracts only on one side
When the diaphragm contracts and moves downward, lung volume increases,
drawing in air.
12. Which part of the brain controls balance and coordination?
