ATI TEAS Practice Test A Exam (Latest
) Tested Questions with
Revised Answers, (A+ Guarantee)
Which of the following cell types provides a waterproofing function for the outer layers of skin?
A. Melanocytes
B. Keratinocytes
C. Merkel cells
D. Langerhans cells - CORRECT ANSWERS B. Keratinocytes
Keratinocytes contain the protein keratin. They are produced in the epidermis and migrate upwards. The
tight junctions between cells prevent water entry. They eventually form a layer of dead cells on the skin
surface, which produces a waterproofing effect.
A person is suddenly frightened. Which of the following reactions occurs next?
A. Liver cells absorb glucose from the blood stream.
B. Blood vessels supplying skeletal muscles constrict.
C. Blood vessels supplying the intestines dilate.
D. Liver cells release glucose into the blood stream. - CORRECT ANSWERS D. Liver cells release
glucose into the blood stream.
Epinephrine causes liver cells to break down glycogen, which causes an increase in sugar in the blood
stream.
Kidneys remove which of the following from the blood?
A. Platelets
B. Salts
C. Oxygen
D. Fat - CORRECT ANSWERS B. Salts
Salts are removed by the kidneys.
Which of the following structures within a human cell is responsible for recycling the materials no longer
functional or needed within the cell?
A. Ribosome
B. Lysosome
C. Mitochondrion
D. Nucleolus - CORRECT ANSWERS B. Lysosome
Lysosomes are specialized vacuoles containing digestive enzymes.
Which of the following are sesamoid bones?
, A. Phalanges
B. Patellae
C. Scapulae
D. Metatarsals - CORRECT ANSWERS B. Patellae
Patellae are sesamoid bones, which develop in response to strain. Patellae are also considered short
bones.
Which of the following chemical compounds prevents the lungs from collapsing?
A. Mucus
B. Surfactant
C. Enzymes
D. Buffers - CORRECT ANSWERS B. Surfactant
Surfactants are lipopolysaccharides that have a hydrophobic and hydrophilic layer. They keep the lungs
inflated.
The use of an electron would most benefit the study of
A. the structure of atoms.
B. the structure of cellular organelles.
C. the structure of skeletal joints.
D. chemical bones in molecules. - CORRECT ANSWERS B. the structure of cellular organelles
Electron microscopy has significantly improved the ability to see and understand the workings of these
organelles because electron wavelengths are short enough to resolve the structure of organelles, which
are around 100x larger than the wavelengths of an electron.
Which of the following arteries directly supplies oxygenated blood to the reproductive system?
A. Common carotid artery
B. Gonadal artery
C. Femoral artery
D. Subclavian artery - CORRECT ANSWERS B. Gonadal artery
The gonadal artery is the primary artery that supplies oxygenated blood to the gonads and male
reproductive system. It is called the testicular artery in males and the ovarian artery in females.
Which of the following connects two bones together?
A. Ligament
B. Tendon
C. Marrow
D. Muscle - CORRECT ANSWERS A. Ligament
Ligaments connect bones together.
) Tested Questions with
Revised Answers, (A+ Guarantee)
Which of the following cell types provides a waterproofing function for the outer layers of skin?
A. Melanocytes
B. Keratinocytes
C. Merkel cells
D. Langerhans cells - CORRECT ANSWERS B. Keratinocytes
Keratinocytes contain the protein keratin. They are produced in the epidermis and migrate upwards. The
tight junctions between cells prevent water entry. They eventually form a layer of dead cells on the skin
surface, which produces a waterproofing effect.
A person is suddenly frightened. Which of the following reactions occurs next?
A. Liver cells absorb glucose from the blood stream.
B. Blood vessels supplying skeletal muscles constrict.
C. Blood vessels supplying the intestines dilate.
D. Liver cells release glucose into the blood stream. - CORRECT ANSWERS D. Liver cells release
glucose into the blood stream.
Epinephrine causes liver cells to break down glycogen, which causes an increase in sugar in the blood
stream.
Kidneys remove which of the following from the blood?
A. Platelets
B. Salts
C. Oxygen
D. Fat - CORRECT ANSWERS B. Salts
Salts are removed by the kidneys.
Which of the following structures within a human cell is responsible for recycling the materials no longer
functional or needed within the cell?
A. Ribosome
B. Lysosome
C. Mitochondrion
D. Nucleolus - CORRECT ANSWERS B. Lysosome
Lysosomes are specialized vacuoles containing digestive enzymes.
Which of the following are sesamoid bones?
, A. Phalanges
B. Patellae
C. Scapulae
D. Metatarsals - CORRECT ANSWERS B. Patellae
Patellae are sesamoid bones, which develop in response to strain. Patellae are also considered short
bones.
Which of the following chemical compounds prevents the lungs from collapsing?
A. Mucus
B. Surfactant
C. Enzymes
D. Buffers - CORRECT ANSWERS B. Surfactant
Surfactants are lipopolysaccharides that have a hydrophobic and hydrophilic layer. They keep the lungs
inflated.
The use of an electron would most benefit the study of
A. the structure of atoms.
B. the structure of cellular organelles.
C. the structure of skeletal joints.
D. chemical bones in molecules. - CORRECT ANSWERS B. the structure of cellular organelles
Electron microscopy has significantly improved the ability to see and understand the workings of these
organelles because electron wavelengths are short enough to resolve the structure of organelles, which
are around 100x larger than the wavelengths of an electron.
Which of the following arteries directly supplies oxygenated blood to the reproductive system?
A. Common carotid artery
B. Gonadal artery
C. Femoral artery
D. Subclavian artery - CORRECT ANSWERS B. Gonadal artery
The gonadal artery is the primary artery that supplies oxygenated blood to the gonads and male
reproductive system. It is called the testicular artery in males and the ovarian artery in females.
Which of the following connects two bones together?
A. Ligament
B. Tendon
C. Marrow
D. Muscle - CORRECT ANSWERS A. Ligament
Ligaments connect bones together.
