Principles of Homeostasis: Practice Questions

• a.

  To initiate a corrective response that reverses the deviation from the set point

• b.

  To permanently stop all hormonal and nervous activity in the body

• c.

  To enhance and amplify the initial change continuously

• d.

  To stimulate the sensory receptor to increase sensitivity to external signals

• a.

  X: Receptor, Y: Control centre, Z: Effector

• b.

  X: Effector, Y: Control centre, Z: Receptor

• c.

  X: Control centre, Y: Effector, Z: Receptor

• d.

  X: Receptor, Y: Effector, Z: Control centre

• a.

  Skin receptors detect decrease \(\rightarrow\) endocrine glands release glucagon \(\rightarrow\) vasodilation of skin capillaries \(\rightarrow\) heat loss increases

• b.

  Skin arterioles detect decrease \(\rightarrow\) negative feedback loop ceases \(\rightarrow\) metabolic rate decreases to conserve core heat

• c.

  Hypothalamus detects decrease \(\rightarrow\) sweat glands increase sweat secretion \(\rightarrow\) evaporative cooling occurs \(\rightarrow\) body temperature rises

• d.

  Hypothalamus detects decrease \(\rightarrow\) nerve impulses sent to effectors \(\rightarrow\) vasoconstriction of skin arterioles and shivering \(\rightarrow\) body temperature returns to normal

• a.

  The maintenance of a constant internal environment

• b.

  The voluntary nervous control of movement in response to stimuli

• c.

  The regulation of the external environment surrounding an organism

• d.

  The total breakdown of stored energy reserves during vigorous exercise

• a.

  Total loss of both sensation and voluntary movement in the arm

• b.

  Loss of voluntary movement, but involuntary reflex responses remain intact

• c.

  Loss of sensation from the arm, but the ability to move the arm remains intact

• d.

  Loss of ability to move the arm, but sensations from the arm remain intact

Write your answer out first, then check it against the worked solution.

Write your answer out first, then check it against the worked solution.