Practice Quiz

MTEL Biology Practice Exam - Question List

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51.
Which of the following best describes an aneurysm and its effect on circulation?
  1. An aneurysm is a blood clot that may stick in an artery and restrict blood flow.
  2. An aneurysm is a deposit of plaque on the wall of an artery that may impede or block blood flow.
  3. An aneurysm is an abnormal connection between an artery and a vein that can lead to decreased oxygen delivery to tissues.
  4. An aneurysm is a weak spot in the wall of an artery that may rupture and cause a major hemorrhage into surrounding tissues.
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52.
Which of the following best describes the function of the cilia that are attached to the epithelial lining of the bronchi and bronchioles of the lungs?
  1. Producing mucous and other secretions that trap pathogens.
  2. Insulating delicate lung tissue from exposure to cold inhaled air.
  3. Moving particulate contaminants upward to the pharynx.
  4. Trapping inhaled oxygen molecules for transfer to the blood.
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53.
Which of the following best describes the mechanism by which hemoglobin loads and unloads oxygen?
  1. Production of CO2 during cellular respiration lowers blood pH, which decreases the affinity of hemoglobin for oxygen and facilitates the unloading of oxygen to cells.
  2. Oxygen molecules binding to one subunit of a hemoglobin molecule change its shape, and the other three subunits also change shape and accept oxygen more readily.
  3. Blood arriving at the lungs has a lower PO2 pressure than the air inside the lungs, which favors the diffusion of oxygen into the blood from the lungs.
  4. Carbon dioxide in the blood as a result of increased cellular respiration causes the heart's pacemaker to speed up and increase the transport of oxygen to cells.
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54.
The sensation of thirst is produced by the brain primarily in response to signals from the body indicating:
  1. Decreased heart rate and blood pressure.
  2. Increased internal temperatures.
  3. Decreased urinary output by the kidneys.
  4. Increased osmolarity of the blood.
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55.
Which of the following best describes a difference between the peripheral nervous system and the central nervous system?
  1. Axons within the peripheral nervous system are longer since they must stretch from cell bodies in the ganglia located along the spine to their destinations in the tissues.
  2. Nerve cells that are located within the peripheral nervous system have many more dendrites than those that are located within the central nervous system.
  3. Synapses within the peripheral nervous system are electrical rather than chemical and so do not require the use of neurotransmitters to transmit information.
  4. Impulses in the peripheral nervous system carry information from the body to the brain, while those in the central nervous system carry it from the brain to the body.
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