1|Page
ATI TEAS 7 SCIENCE Newest Exam Preparation
With Complete Questions And Correct Answers With
Rationales Already Graded A+Brand New Version!!
QUESTION 1
Which of the following structures is responsible for the exchange of
gases between the blood and the external environment?
A) Alveoli
B) Bronchi
C) Trachea
D) Pharynx
Answer: A) Alveoli
Explanation: Alveoli are small, balloon-like structures located at the end
of the bronchial tree within the lungs. They are the primary sites of gas
exchange due to their extensive surface area and thin epithelial layers,
which allow for the diffusion of oxygen into the blood and carbon
dioxide out of the blood.
QUESTION 2
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The process by which glucose is broken down in the absence of oxygen
is known as:
A) Aerobic respiration
B) Fermentation
C) Krebs cycle
D) Oxidative phosphorylation
Answer: B) Fermentation
Explanation: Fermentation is an anaerobic process that breaks down
glucose into smaller molecules such as lactic acid or ethanol,
regenerating NAD+ from NADH to allow glycolysis to continue when
oxygen is unavailable. It yields far less ATP than aerobic respiration.
QUESTION 3
Which of the following organs is primarily responsible for the filtration
of blood and the formation of urine?
A) Liver
B) Spleen
C) Kidney
D) Pancreas
Answer: C) Kidney
Explanation: The kidneys are the primary excretory organs that filter
waste products, excess ions, and water from the blood to form urine.
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The liver, spleen, and pancreas have other primary functions such as
metabolism, immune response, and digestion, respectively.
QUESTION 4
In the human digestive system, which enzyme is responsible for the
breakdown of starches into simpler sugars in the mouth?
A) Pepsin
B) Trypsin
C) Amylase
D) Lipase
Answer: C) Amylase
Explanation: Salivary amylase is secreted by the salivary glands and
initiates the chemical digestion of carbohydrates by hydrolyzing starch
into maltose and dextrins. Pepsin and trypsin are protein-digesting
enzymes, while lipase acts on fats.
QUESTION 5
Which of the following blood vessels carries oxygenated blood away
from the heart to the rest of the body?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Vena cava
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Answer: C) Aorta
Explanation: The aorta is the largest artery in the body and carries
oxygenated blood from the left ventricle to the systemic circulation. The
pulmonary artery carries deoxygenated blood to the lungs, while the
pulmonary vein returns oxygenated blood to the heart, and the vena
cava returns deoxygenated blood to the right atrium.
QUESTION 6
The primary function of platelets in the blood is:
A) Transport of oxygen
B) Defense against pathogens
C) Hemostasis and clot formation
D) Regulation of blood pH
Answer: C) Hemostasis and clot formation
Explanation: Platelets, or thrombocytes, are cell fragments that play a
critical role in hemostasis by adhering to damaged vessel walls,
aggregating, and releasing factors that initiate the coagulation cascade
to form a blood clot. Oxygen transport is carried out by erythrocytes,
and immune defense is primarily the role of leukocytes.
QUESTION 7
Which of the following is a characteristic of prokaryotic cells that
distinguishes them from eukaryotic cells?
ATI TEAS 7 SCIENCE Newest Exam Preparation
With Complete Questions And Correct Answers With
Rationales Already Graded A+Brand New Version!!
QUESTION 1
Which of the following structures is responsible for the exchange of
gases between the blood and the external environment?
A) Alveoli
B) Bronchi
C) Trachea
D) Pharynx
Answer: A) Alveoli
Explanation: Alveoli are small, balloon-like structures located at the end
of the bronchial tree within the lungs. They are the primary sites of gas
exchange due to their extensive surface area and thin epithelial layers,
which allow for the diffusion of oxygen into the blood and carbon
dioxide out of the blood.
QUESTION 2
,2|Page
The process by which glucose is broken down in the absence of oxygen
is known as:
A) Aerobic respiration
B) Fermentation
C) Krebs cycle
D) Oxidative phosphorylation
Answer: B) Fermentation
Explanation: Fermentation is an anaerobic process that breaks down
glucose into smaller molecules such as lactic acid or ethanol,
regenerating NAD+ from NADH to allow glycolysis to continue when
oxygen is unavailable. It yields far less ATP than aerobic respiration.
QUESTION 3
Which of the following organs is primarily responsible for the filtration
of blood and the formation of urine?
A) Liver
B) Spleen
C) Kidney
D) Pancreas
Answer: C) Kidney
Explanation: The kidneys are the primary excretory organs that filter
waste products, excess ions, and water from the blood to form urine.
,3|Page
The liver, spleen, and pancreas have other primary functions such as
metabolism, immune response, and digestion, respectively.
QUESTION 4
In the human digestive system, which enzyme is responsible for the
breakdown of starches into simpler sugars in the mouth?
A) Pepsin
B) Trypsin
C) Amylase
D) Lipase
Answer: C) Amylase
Explanation: Salivary amylase is secreted by the salivary glands and
initiates the chemical digestion of carbohydrates by hydrolyzing starch
into maltose and dextrins. Pepsin and trypsin are protein-digesting
enzymes, while lipase acts on fats.
QUESTION 5
Which of the following blood vessels carries oxygenated blood away
from the heart to the rest of the body?
A) Pulmonary artery
B) Pulmonary vein
C) Aorta
D) Vena cava
, 4|Page
Answer: C) Aorta
Explanation: The aorta is the largest artery in the body and carries
oxygenated blood from the left ventricle to the systemic circulation. The
pulmonary artery carries deoxygenated blood to the lungs, while the
pulmonary vein returns oxygenated blood to the heart, and the vena
cava returns deoxygenated blood to the right atrium.
QUESTION 6
The primary function of platelets in the blood is:
A) Transport of oxygen
B) Defense against pathogens
C) Hemostasis and clot formation
D) Regulation of blood pH
Answer: C) Hemostasis and clot formation
Explanation: Platelets, or thrombocytes, are cell fragments that play a
critical role in hemostasis by adhering to damaged vessel walls,
aggregating, and releasing factors that initiate the coagulation cascade
to form a blood clot. Oxygen transport is carried out by erythrocytes,
and immune defense is primarily the role of leukocytes.
QUESTION 7
Which of the following is a characteristic of prokaryotic cells that
distinguishes them from eukaryotic cells?
