Which of the following statements best describes the function of erythropoietin in the human body?
A. It aids in lowering oxygen levels in the blood.
B. It aids in raising levels of clotting factors in the blood.
C. It aids in raising hemoglobin levels in the blood.
D. It aids in lowering CO2 levels in the blood.
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Erythropoietin is a hormone that is produced by the kidneys and stimulates the production of red blood cells in the bone marrow. Red blood cells contain hemoglobin, a protein that binds to oxygen and transports it to the tissues. Therefore, erythropoietin helps to maintain adequate oxygen levels in the blood and prevent anemia.
Therefore, the Correct Answer is C.
More Questions on TEAS 7 Practice Exam 4
Question 1:
Which of the following are the two major parts of the nervous system?
A. Autonomic nervous system and central nervous system
B. Peripheral nervous system and central nervous system
C. Peripheral nervous system and somatic nervous system
D. Autonomic nervous system and somatic nervous system
The Correct Answer is B.The nervous system is divided into two major parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS consists of the brain and spinal cord, while the PNS consists of all the nerves outside of the CNS.
Question 2:
Which of the following is the function of a totipotent cell?
A. Aids in the maturation of sex cells
B. Carries electrical impulses
C. Develops into any kind of cell
D. Fights infectious diseases
The Correct Answer is C.A totipotent cell is a type of stem cell that has the ability to develop into any kind of cell in the body, including the cells that make up the placenta and the umbilical cord. This means that a totipotent cell can generate a complete organism from a single cell. The only natural example of totipotent cells are the fertilized egg and the cells produced by the first few divisions of the egg. Totipotent cells are different from other types of stem cells, such as pluripotent cells, which can develop into any cell type except for the placenta and the umbilical cord, and multipotent cells, which can only develop into a limited range of cell types.
Question 3:
Which of the following statements best describes the function of erythropoietin in the human body?
A. It aids in lowering oxygen levels in the blood.
B. It aids in raising levels of clotting factors in the blood.
C. It aids in raising hemoglobin levels in the blood.
D. It aids in lowering CO2 levels in the blood.
The Correct Answer is C.Erythropoietin is a hormone that is produced by the kidneys and stimulates the production of red blood cells in the bone marrow. Red blood cells contain hemoglobin, a protein that binds to oxygen and transports it to the tissues. Therefore, erythropoietin helps to maintain adequate oxygen levels in the blood and prevent anemia.
Question 4:
Which of the following microorganisms lack their own metabolic pathways and can only reproduce inside of a host cell?
A. Viruses
B. Bacteria
C. Helminths
D. Protozoa
The Correct Answer is A.Among the four types of microorganisms listed, only viruses lack their own metabolic pathways and can only reproduce inside of a host cell. Viruses are considered to be obligate intracellular parasites, meaning that they depend on another living cell for their survival and replication. Bacteria, helminths, and protozoa, on the other hand, are able to metabolize nutrients and energy from their surroundings and can reproduce independently of a host cell.
Question 5:
Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom?
A. 12
B. 3
C. 4
D. 7
The Correct Answer is B.The number of protons in an atom is equal to its atomic number. In this case, lithium has an atomic number of 3, so it contains 3 protons.
The other choices (A, C, and D) do not represent the correct number of protons for a lithium atom.
Question 6:
The measurement indicated by the line across the center of the cell is best referred to as which of the following?
A. Diameter
B. Volume
C. Area
D. Radius
The Correct Answer is A.One way to assess the size of a cell is to measure its diameter, which is the length of a straight line that passes through the center of the cell and touches both sides. The measurement indicated by the line across the center of the cell in the diagram is best referred to as the diameter of the cell.
Question 7:
Which of the following is the process in which an ovarian follicle matures and releases a reproductive egg?
A. Oogenesis
B. Ovulation
C. Menstruation
D. Fertilization
The Correct Answer is B.The process in which an ovarian follicle matures and releases a reproductive egg is called ovulation. Ovulation is one of the phases of the menstrual cycle, which also includes follicular phase, luteal phase and menstruation
Question 8:
Which of the following allows the AIDS virus, which contains RNA, to insert viral DNA into the DNA of a host T-cell after the AIDS virus enters the cell?
A. Reverse transcriptase, an enzyme encoded by the virus.
B. Receptor proteins located on the surface of the virus.
C. The phospholipids found on the envelope of the virus.
D. The protein that makes up the capsid of the virus.
The Correct Answer is A.Reverse transcriptase, an enzyme encoded by the virus. This enzyme can convert the viral RNA into DNA, which can then integrate into the host cell's genome and hijack its machinery to produce more viruses. The other options are not relevant to this process. Receptor proteins are involved in binding the virus to the cell membrane, but they do not insert viral DNA into the cell. The phospholipids and the protein capsid are structural components of the virus, but they do not have any enzymatic activity.
Question 9:
Which of the following is the structure through which blood exits the glomerulus?
A. Proximal tubule
B. Distal tubule
C. Afferent arteriole
D. Efferent arteriole
The Correct Answer is D.The glomerulus is a network of capillaries that filters blood and forms the primary urine. The blood enters the glomerulus through the afferent arteriole and leaves through the efferent arteriole. The efferent arteriole has a smaller diameter than the afferent arteriole, creating a high pressure in the glomerulus that facilitates filtration.
Question 10:
Which of the following substances protects the skin from ultraviolet radiation?
A. Melanin
B. Perspiration
C. Sebum
D. Keratin
The Correct Answer is A.One of the functions of the skin is to protect the body from harmful effects of ultraviolet (UV) radiation. UV rays can damage the DNA of skin cells and cause mutations that may lead to skin cancer. The skin has a natural defense mechanism against UV radiation, which is the production of a pigment called melanin. Melanin is synthesized by specialized cells called melanocytes, which are located in the basal layer of the epidermis. Melanin absorbs UV rays and prevents them from reaching the deeper layers of the skin.