ATI TEAS 7 EXAM– QUESTIONS AND ANSWERS | VERIFIED
AND WELL DETAILED ANSWERS PLUS RATIONALES |
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1. Which of the following respiratory structures is primarily responsible for preventing
food from entering the trachea during swallowing?
A. Pharynx
B. Larynx
C. Epiglottis
D. Glottis
ANSWER: C. Epiglottis
The epiglottis is a flap of elastic cartilage located at the root of the tongue that folds backward
during swallowing to cover the entrance of the larynx, preventing aspiration into the trachea.
The pharynx is a shared muscular passage for food and air, the larynx houses the vocal cords,
and the glottis is the opening between the vocal cords.
2. A nurse is reviewing a patient's laboratory report and notes a blood pH of 7.28. Which of
the following physiological imbalances does this value indicate?
A. Metabolic alkalosis
B. Respiratory alkalosis
C. Acidemia
D. Normal homeostasis
ANSWER: C. Acidemia
A blood pH below the normal physiological range of 7.35 to 7.45 indicates acidemia, which
reflects an excess of hydrogen ions or a deficit of base within the blood. Metabolic and
respiratory alkalosis refer to states where the pH exceeds 7.45, while 7.28 falls outside normal
homeostatic parameters.
3. Which of the following biological macromolecules is primarily composed of amino acid
chains linked by peptide bonds?
,A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic acids
ANSWER: C. Proteins
Proteins are large macromolecules built from long chains of amino acids connected via
peptide bonds, serving structural, enzymatic, and regulatory functions. Carbohydrates are
composed of monosaccharide units, lipids consist largely of fatty acids and glycerol, and
nucleic acids are polymers of nucleotides.
4. Which of the following blood vessels carries oxygenated blood away from the left
ventricle of the heart?
A. Superior vena cava
B. Pulmonary artery
C. Pulmonary vein
D. Aorta
ANSWER: D. Aorta
The aorta is the body's largest systemic artery, originating at the left ventricle and distributing
freshly oxygenated blood to the entire systemic circulation. The superior vena cava returns
deoxygenated blood to the right atrium, the pulmonary artery carries deoxygenated blood to
the lungs, and pulmonary veins return oxygenated blood to the left atrium.
5. What is the primary function of the myelin sheath surrounding many vertebrate
neurons?
A. To generate neurotransmitters for synaptic transmission
B. To increase the speed of electrical impulse conduction along the axon
C. To provide structural support and nutrients directly to the cell body
D. To physically protect the central nervous system from blunt trauma
ANSWER: B. To increase the speed of electrical impulse conduction along the axon
,The myelin sheath acts as an electrical insulator, allowing action potentials to jump rapidly
from node to node via saltatory conduction, thereby drastically increasing transmission
velocity. Neurotransmitters are synthesized in the cell body and stored in axon terminals, glial
cells support neurons rather than myelination serving as nutrition, and the cranium and
meninges protect the central nervous system from trauma.
6. Which of the following anatomical terms describes the position of the sternum relative to
the vertebral column?
A. Posterior
B. Distal
C. Anterior
D. Inferior
ANSWER: C. Anterior
Anterior refers to the front side of the body, making the sternum anterior to the vertebral
column. Posterior means toward the back, distal denotes being farther from the point of
attachment along a limb, and inferior indicates a position lower on the body.
7. Which cellular organelle is the primary site of adenosine triphosphate (ATP) production
via aerobic cellular respiration?
A. Ribosome
B. Mitochondrion
C. Golgi apparatus
D. Lysosome
ANSWER: B. Mitochondrion
Mitochondria are known as the powerhouses of the cell because they generate the vast
majority of cellular ATP through the citric acid cycle and oxidative phosphorylation.
Ribosomes are responsible for protein synthesis, the Golgi apparatus modifies and packages
proteins, and lysosomes contain digestive enzymes for waste breakdown.
8. Which of the following enzymes is primarily responsible for initiating the chemical
digestion of starches in the human oral cavity?
A. Pepsin
, B. Lipase
C. Amylase
D. Trypsin
ANSWER: C. Amylase
Salivary amylase is secreted by the salivary glands and begins breaking down complex
starches into simpler disaccharides within the mouth. Pepsin digests proteins in the stomach,
lipase breaks down fats primarily in the small intestine, and trypsin is a pancreatic protease.
9. In a monohybrid cross between two heterozygous individuals (Bb x Bb), what is the
expected phenotypic ratio of the offspring assuming complete dominance?
A. 1:2:1
B. 3:1
C. 9:3:3:1
D. 1:1
ANSWER: B. 3:1
A cross between two heterozygotes yields a genotypic ratio of 1 BB to 2 Bb to 1 bb, which
translates to a phenotypic ratio of 3 dominant individuals to 1 recessive individual under
complete dominance. The 1:2:1 ratio represents the genotypic breakdown, 9:3:3:1 represents a
dihybrid cross, and 1:1 represents a testcross.
10. Which of the following structures constitutes the fundamental functional unit of a
skeletal muscle contraction?
A. Sarcolemma
B. Myofibril
C. Sarcomere
D. Sarcoplasmic reticulum
ANSWER: C. Sarcomere
The sarcomere is the repeating contractile unit of a striated muscle fiber, bounded by Z lines
and composed of overlapping actin and myosin filaments. The sarcolemma is the cell
AND WELL DETAILED ANSWERS PLUS RATIONALES |
GUARANTEED PASS | LATEST EXAM UPDATE | EXAM PREP |
STUDY GUIDE | PRACTICE TEST| DOWNLOAD INSTANT PDF
1. Which of the following respiratory structures is primarily responsible for preventing
food from entering the trachea during swallowing?
A. Pharynx
B. Larynx
C. Epiglottis
D. Glottis
ANSWER: C. Epiglottis
The epiglottis is a flap of elastic cartilage located at the root of the tongue that folds backward
during swallowing to cover the entrance of the larynx, preventing aspiration into the trachea.
The pharynx is a shared muscular passage for food and air, the larynx houses the vocal cords,
and the glottis is the opening between the vocal cords.
2. A nurse is reviewing a patient's laboratory report and notes a blood pH of 7.28. Which of
the following physiological imbalances does this value indicate?
A. Metabolic alkalosis
B. Respiratory alkalosis
C. Acidemia
D. Normal homeostasis
ANSWER: C. Acidemia
A blood pH below the normal physiological range of 7.35 to 7.45 indicates acidemia, which
reflects an excess of hydrogen ions or a deficit of base within the blood. Metabolic and
respiratory alkalosis refer to states where the pH exceeds 7.45, while 7.28 falls outside normal
homeostatic parameters.
3. Which of the following biological macromolecules is primarily composed of amino acid
chains linked by peptide bonds?
,A. Carbohydrates
B. Lipids
C. Proteins
D. Nucleic acids
ANSWER: C. Proteins
Proteins are large macromolecules built from long chains of amino acids connected via
peptide bonds, serving structural, enzymatic, and regulatory functions. Carbohydrates are
composed of monosaccharide units, lipids consist largely of fatty acids and glycerol, and
nucleic acids are polymers of nucleotides.
4. Which of the following blood vessels carries oxygenated blood away from the left
ventricle of the heart?
A. Superior vena cava
B. Pulmonary artery
C. Pulmonary vein
D. Aorta
ANSWER: D. Aorta
The aorta is the body's largest systemic artery, originating at the left ventricle and distributing
freshly oxygenated blood to the entire systemic circulation. The superior vena cava returns
deoxygenated blood to the right atrium, the pulmonary artery carries deoxygenated blood to
the lungs, and pulmonary veins return oxygenated blood to the left atrium.
5. What is the primary function of the myelin sheath surrounding many vertebrate
neurons?
A. To generate neurotransmitters for synaptic transmission
B. To increase the speed of electrical impulse conduction along the axon
C. To provide structural support and nutrients directly to the cell body
D. To physically protect the central nervous system from blunt trauma
ANSWER: B. To increase the speed of electrical impulse conduction along the axon
,The myelin sheath acts as an electrical insulator, allowing action potentials to jump rapidly
from node to node via saltatory conduction, thereby drastically increasing transmission
velocity. Neurotransmitters are synthesized in the cell body and stored in axon terminals, glial
cells support neurons rather than myelination serving as nutrition, and the cranium and
meninges protect the central nervous system from trauma.
6. Which of the following anatomical terms describes the position of the sternum relative to
the vertebral column?
A. Posterior
B. Distal
C. Anterior
D. Inferior
ANSWER: C. Anterior
Anterior refers to the front side of the body, making the sternum anterior to the vertebral
column. Posterior means toward the back, distal denotes being farther from the point of
attachment along a limb, and inferior indicates a position lower on the body.
7. Which cellular organelle is the primary site of adenosine triphosphate (ATP) production
via aerobic cellular respiration?
A. Ribosome
B. Mitochondrion
C. Golgi apparatus
D. Lysosome
ANSWER: B. Mitochondrion
Mitochondria are known as the powerhouses of the cell because they generate the vast
majority of cellular ATP through the citric acid cycle and oxidative phosphorylation.
Ribosomes are responsible for protein synthesis, the Golgi apparatus modifies and packages
proteins, and lysosomes contain digestive enzymes for waste breakdown.
8. Which of the following enzymes is primarily responsible for initiating the chemical
digestion of starches in the human oral cavity?
A. Pepsin
, B. Lipase
C. Amylase
D. Trypsin
ANSWER: C. Amylase
Salivary amylase is secreted by the salivary glands and begins breaking down complex
starches into simpler disaccharides within the mouth. Pepsin digests proteins in the stomach,
lipase breaks down fats primarily in the small intestine, and trypsin is a pancreatic protease.
9. In a monohybrid cross between two heterozygous individuals (Bb x Bb), what is the
expected phenotypic ratio of the offspring assuming complete dominance?
A. 1:2:1
B. 3:1
C. 9:3:3:1
D. 1:1
ANSWER: B. 3:1
A cross between two heterozygotes yields a genotypic ratio of 1 BB to 2 Bb to 1 bb, which
translates to a phenotypic ratio of 3 dominant individuals to 1 recessive individual under
complete dominance. The 1:2:1 ratio represents the genotypic breakdown, 9:3:3:1 represents a
dihybrid cross, and 1:1 represents a testcross.
10. Which of the following structures constitutes the fundamental functional unit of a
skeletal muscle contraction?
A. Sarcolemma
B. Myofibril
C. Sarcomere
D. Sarcoplasmic reticulum
ANSWER: C. Sarcomere
The sarcomere is the repeating contractile unit of a striated muscle fiber, bounded by Z lines
and composed of overlapping actin and myosin filaments. The sarcolemma is the cell
