ZOOL 200 Chapter 3 – Zoology Study Guide, Key Concepts and Animal Biology
Review
Many animals communicate through the use of pheromones. Which of the following is one
disadvantage of pheromones as a communication system? - ✔✔Most pheromones dissipate
quickly in the environment
___ are chemical signals that, instead of being secreted into the bloodstream, are introduced by
animals into their habitats. They can be used to attract mates and mark territories. -
✔✔Pheromones
Blood glucose levels are regulated by ___, in which an increase or decrease in glucose signals
the pancreas to stop producing glucagon or insulin, respectively. - ✔✔Negative feedback
In vertebrates, which of the following frequently serves as the first intermediary between the
areas of the brain that perceive sensory stimuli and the rest of the endocrine system? - ✔✔The
hypothalamus
What is the difference between negative feedback and positive feedback mechanisms? -
✔✔Negative feedback mechanisms return a system to a set point; positive feedback
mechanisms amplify a response.
Hormones play a role in which of the following processes in humans? - ✔✔circadian rhythms,
regulating blood glucose levels, metabolism, sexual arousal, childbirth
In the human body, which of the following structures contains cells that are part of the
endocrine system? - ✔✔the stomach, the intestines, the ovaries, the brain, the pancreas
Review
Many animals communicate through the use of pheromones. Which of the following is one
disadvantage of pheromones as a communication system? - ✔✔Most pheromones dissipate
quickly in the environment
___ are chemical signals that, instead of being secreted into the bloodstream, are introduced by
animals into their habitats. They can be used to attract mates and mark territories. -
✔✔Pheromones
Blood glucose levels are regulated by ___, in which an increase or decrease in glucose signals
the pancreas to stop producing glucagon or insulin, respectively. - ✔✔Negative feedback
In vertebrates, which of the following frequently serves as the first intermediary between the
areas of the brain that perceive sensory stimuli and the rest of the endocrine system? - ✔✔The
hypothalamus
What is the difference between negative feedback and positive feedback mechanisms? -
✔✔Negative feedback mechanisms return a system to a set point; positive feedback
mechanisms amplify a response.
Hormones play a role in which of the following processes in humans? - ✔✔circadian rhythms,
regulating blood glucose levels, metabolism, sexual arousal, childbirth
In the human body, which of the following structures contains cells that are part of the
endocrine system? - ✔✔the stomach, the intestines, the ovaries, the brain, the pancreas
