ATI TEAS 2026 Complete Exam Package | All
Sections Included (Reading, Science, Math,
English and Language Usage) | Latest Versions |
Questions and Answers
SCIENCE SECTION (Questions 1-50)
Question 1: Which of the following correctly describes the function of the sinoatrial (SA)
node?
A) It pumps oxygenated blood to the systemic circulation
B) It initiates the electrical impulse that sets the heart rate
C) It prevents backflow of blood between the atria and ventricles
D) It exchanges gases between the blood and alveoli
Correct Answer: B) It initiates the electrical impulse that sets the heart rate
Rationale: The SA node, located in the right atrium, is the heart's natural pacemaker. It
generates electrical impulses that spread through the heart muscle, initiating each
heartbeat. The left ventricle pumps blood to systemic circulation, valves prevent backflow,
and alveoli handle gas exchange.
Question 2: A patient has a blockage in the renal artery. Which of the following would
MOST likely result?
A) Decreased urine production
B) Increased glomerular filtration rate
C) Elevated blood glucose
D) Decreased blood pressure
Correct Answer: A) Decreased urine production
Rationale: The renal artery supplies blood to the kidney for filtration. A blockage reduces
blood flow, leading to decreased filtration and urine production (renal ischemia). GFR
would decrease, not increase.
,Question 3: Which of the following is the primary function of the large intestine?
A) Absorption of nutrients
B) Absorption of water and electrolytes
C) Secretion of digestive enzymes
D) Production of bile
Correct Answer: B) Absorption of water and electrolytes
Rationale: The large intestine's primary role is to absorb water and electrolytes from
undigested material, forming solid waste (feces). Nutrient absorption occurs mainly in the
small intestine. The liver produces bile, and the pancreas secretes digestive enzymes.
Question 4: In which stage of the cell cycle does DNA replication occur?
A) G1 phase
B) S phase
C) G2 phase
D) M phase
Correct Answer: B) S phase (Synthesis phase)
Rationale: DNA replication occurs during the S phase of interphase. G1 is cell growth, G2
is preparation for mitosis, and M phase is actual cell division (mitosis/cytokinesis).
Question 5: Which of the following is a characteristic of an exothermic reaction?
A) Absorbs heat from the surroundings
B) Releases heat to the surroundings
C) Requires constant energy input
D) Decreases the temperature of the surroundings
Correct Answer: B) Releases heat to the surroundings
,Rationale: Exothermic reactions release energy (usually in the form of heat) to the
surroundings, causing the surroundings to warm up. Endothermic reactions absorb heat.
Question 6: Which organelle is responsible for producing ATP through cellular
respiration?
A) Ribosome
B) Golgi apparatus
C) Mitochondria
D) Endoplasmic reticulum
Correct Answer: C) Mitochondria
Rationale: Mitochondria are the "powerhouses" of the cell, generating ATP through aerobic
cellular respiration. Ribosomes synthesize proteins, the Golgi apparatus modifies and
packages proteins, and the ER synthesizes lipids and proteins.
Question 7: Which of the following blood vessels carries oxygenated blood away from
the heart?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Vena cava
Correct Answer: C) Aorta
Rationale: The aorta is the main artery that carries oxygenated blood from the left
ventricle to the systemic circulation. The pulmonary artery carries deoxygenated blood to
the lungs, while the pulmonary vein carries oxygenated blood from the lungs to the heart.
Question 8: What is the pH range of a basic (alkaline) solution?
, A) 0-6
B) 7
C) 8-14
D) 14
Correct Answer: C) 8-14
Rationale: The pH scale ranges from 0 to 14. Solutions with a pH below 7 are acidic, pH 7
is neutral, and pH above 7 (8-14) is basic (alkaline).
Question 9: Which of the following is the correct order of organization in a multicellular
organism?
A) Cells → Tissues → Organs → Organ Systems → Organism
B) Tissues → Cells → Organs → Organ Systems → Organism
C) Cells → Organs → Tissues → Organ Systems → Organism
D) Cells → Tissues → Organ Systems → Organs → Organism
Correct Answer: A) Cells → Tissues → Organs → Organ Systems → Organism
Rationale: Cells are the basic unit of life; similar cells form tissues; different tissues
combine to form organs; organs work together in organ systems; all systems comprise the
organism.
Question 10: Which of the following is NOT a function of the liver?
A) Production of bile
B) Storage of glycogen
C) Detoxification of substances
D) Production of insulin
Correct Answer: D) Production of insulin
Rationale: The liver produces bile, stores glycogen, and detoxifies substances. Insulin is
produced by the beta cells of the pancreas, not the liver.
Sections Included (Reading, Science, Math,
English and Language Usage) | Latest Versions |
Questions and Answers
SCIENCE SECTION (Questions 1-50)
Question 1: Which of the following correctly describes the function of the sinoatrial (SA)
node?
A) It pumps oxygenated blood to the systemic circulation
B) It initiates the electrical impulse that sets the heart rate
C) It prevents backflow of blood between the atria and ventricles
D) It exchanges gases between the blood and alveoli
Correct Answer: B) It initiates the electrical impulse that sets the heart rate
Rationale: The SA node, located in the right atrium, is the heart's natural pacemaker. It
generates electrical impulses that spread through the heart muscle, initiating each
heartbeat. The left ventricle pumps blood to systemic circulation, valves prevent backflow,
and alveoli handle gas exchange.
Question 2: A patient has a blockage in the renal artery. Which of the following would
MOST likely result?
A) Decreased urine production
B) Increased glomerular filtration rate
C) Elevated blood glucose
D) Decreased blood pressure
Correct Answer: A) Decreased urine production
Rationale: The renal artery supplies blood to the kidney for filtration. A blockage reduces
blood flow, leading to decreased filtration and urine production (renal ischemia). GFR
would decrease, not increase.
,Question 3: Which of the following is the primary function of the large intestine?
A) Absorption of nutrients
B) Absorption of water and electrolytes
C) Secretion of digestive enzymes
D) Production of bile
Correct Answer: B) Absorption of water and electrolytes
Rationale: The large intestine's primary role is to absorb water and electrolytes from
undigested material, forming solid waste (feces). Nutrient absorption occurs mainly in the
small intestine. The liver produces bile, and the pancreas secretes digestive enzymes.
Question 4: In which stage of the cell cycle does DNA replication occur?
A) G1 phase
B) S phase
C) G2 phase
D) M phase
Correct Answer: B) S phase (Synthesis phase)
Rationale: DNA replication occurs during the S phase of interphase. G1 is cell growth, G2
is preparation for mitosis, and M phase is actual cell division (mitosis/cytokinesis).
Question 5: Which of the following is a characteristic of an exothermic reaction?
A) Absorbs heat from the surroundings
B) Releases heat to the surroundings
C) Requires constant energy input
D) Decreases the temperature of the surroundings
Correct Answer: B) Releases heat to the surroundings
,Rationale: Exothermic reactions release energy (usually in the form of heat) to the
surroundings, causing the surroundings to warm up. Endothermic reactions absorb heat.
Question 6: Which organelle is responsible for producing ATP through cellular
respiration?
A) Ribosome
B) Golgi apparatus
C) Mitochondria
D) Endoplasmic reticulum
Correct Answer: C) Mitochondria
Rationale: Mitochondria are the "powerhouses" of the cell, generating ATP through aerobic
cellular respiration. Ribosomes synthesize proteins, the Golgi apparatus modifies and
packages proteins, and the ER synthesizes lipids and proteins.
Question 7: Which of the following blood vessels carries oxygenated blood away from
the heart?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Vena cava
Correct Answer: C) Aorta
Rationale: The aorta is the main artery that carries oxygenated blood from the left
ventricle to the systemic circulation. The pulmonary artery carries deoxygenated blood to
the lungs, while the pulmonary vein carries oxygenated blood from the lungs to the heart.
Question 8: What is the pH range of a basic (alkaline) solution?
, A) 0-6
B) 7
C) 8-14
D) 14
Correct Answer: C) 8-14
Rationale: The pH scale ranges from 0 to 14. Solutions with a pH below 7 are acidic, pH 7
is neutral, and pH above 7 (8-14) is basic (alkaline).
Question 9: Which of the following is the correct order of organization in a multicellular
organism?
A) Cells → Tissues → Organs → Organ Systems → Organism
B) Tissues → Cells → Organs → Organ Systems → Organism
C) Cells → Organs → Tissues → Organ Systems → Organism
D) Cells → Tissues → Organ Systems → Organs → Organism
Correct Answer: A) Cells → Tissues → Organs → Organ Systems → Organism
Rationale: Cells are the basic unit of life; similar cells form tissues; different tissues
combine to form organs; organs work together in organ systems; all systems comprise the
organism.
Question 10: Which of the following is NOT a function of the liver?
A) Production of bile
B) Storage of glycogen
C) Detoxification of substances
D) Production of insulin
Correct Answer: D) Production of insulin
Rationale: The liver produces bile, stores glycogen, and detoxifies substances. Insulin is
produced by the beta cells of the pancreas, not the liver.
