ATI TEAS Practice Test A Questions with Answers

Which of the following cell types provides a waterproofing function for the outer lay- ers of skin? A. Melanocytes B. Keratinocytes C. Merkel cells D. Langerhans cells 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 mus- cles constrict. C.Blood vessels supplying the intestines dilate. D. Liver cells release glucose into the blood stream. Kidneys remove which of the following from the blood? A. Platelets B. Salts C. Oxygen D.Fat Which of the following structures within a human cell is responsible for recy- cling the materials no longer functional or needed within the cell? A. Ribosome B. Lysosome C. Mitochondrion D. Nucleolus 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. D. Liver cells release glucose into the blood stream. Epinephrine causes liver cells to break down glycogen, which causes an in- crease in sugar in the blood stream. B. Salts Salts are removed by the kidneys. B. Lysosome Lysosomes are specialized vacuoles containing digestive enzymes.