GED Practice

GED Science Review: Human Body Systems

Directions: Refer to the passage on the previous page to answer question 1. Write your answer on a separate piece of paper.
  1. A fever, or internal temperature over 98.6°F, is a common symptom of infectious diseases. Although a high, prolonged fever can harm the body, a temporary fever can help it to fight the illness. In a paragraph, describe how the body's negative feedback loop can work to create and sustain a fever in a person with a starting body temperature of 98.6°F.

    Directions: Choose the answer to each question.

    Question 2 and 3 refer to the following paragraph and chart.

    The endocrine system consists of glands that secrete chemicals called hormones. Hormones travel throughout the entire body but affect only some parts of it.

  2. While rushing to put out a fire, your heart rate and breathing quicken, and you have a sudden burst of energy. Which endocrine gland causes this reaction?
    • adrenal
    • parathyroid
    • pituitary
    • thymus
  3. Which hormone causes the uterus to contract during childbirth?
    • adrenaline
    • estrogen
    • oxytocin
    • testosterone

      Questions 4 and 5 refer to the following passage and diagram.

      Some human behavior, like a simple reflex, is inborn. A simple reflex is an automatic response to a stimulus. For example, If a flame burns your finger, you automatically withdraw your hand.

      A simple reflex works this way: A sensory neuron carries information about a stimulus from your skin to your spinal cord. In your spinal cord, the information is passed to motor neurons that go to muscles in your arm and hand. You pull your hand away quickly. The reflex is so rapid that it takes place before information about the event has time to reach your brain. Once it reaches your brain, your experience pain.
  4. Which is the best definition of the term stimulus, as it is used in the passage?
    • a signal from the external environment
    • a series of changes to neurons and nerves
    • a signal sent from the spinal cord to the muscles
    • a series of neurons connecting the skin to the brain
  5. Which of the following is not required to produce a simple reflex?
    • a signal from a interneuron to the brain
    • a signal from a motor neuron to a muscle cell
    • a signal from a skin receptor to the spinal cord
    • a signal from a interneuron to a motor neuron

      Question 6 refers to the following passage.

      The human heart drives two separate circulations of blood. The right side of the heart is responsible for the pulmonary circulation, which pumps oxygen-poor blood through the pulmonary arteries to the lungs. Gas exchange—the release of carbon dioxide and the pickup of oxygen—occurs in the lungs. The oxygenated blood is then returned to the left side of the heart through pulmonary veins. The left side of the heart is responsible for driving the systemic circulation, which pumps oxygen-rich blood through a network of arteries to the tissues of the body.
  6. Which statement describes how the terms pulmonary and systemic are used in the passage?
    • Pulmonary refers to the arteries, while systemic refers to the veins.
    • Pulmonary refers to the lungs, while systemic refers to the rest of the body.
    • Pulmonary refers to gas exchange, while systemic refers to the movement of blood.
    • Pulmonary refers to oxygen-rich blood, while systemic refers to oxygen-poor blood.

  1. many answers
  2. adrenal
  3. adrenaline
  4. a signal sent from the spinal cord to the muscles
  5. a signal from a interneuron to the brain
  6. Pulmonary refers to the lungs, while systemic refers to the rest of the body.


Complete Test Preparation for the GED Test 2014 by Steck-Vaughn