Biology: Positive and Negative Feedback Mechanisms

To regulate body functions

Steroid hormones are lipid in nature and can pass through the cell membrane, while peptide hormones are peptide, protein, or modified amino acids that must bind to a receptor protein first

To gather information from the external environment

<p>To detect the amount of hormones in circulation or the amount of other chemicals produced because of hormone action</p> Signup and view all the answers

<p>Paracrine is when regulators are released and act within the cells of certain organs to regulate others, differing from hormone signaling which is released into the bloodstream</p> Signup and view all the answers

<p>The brain, which receives information from the sensors</p> Signup and view all the answers

<p>to stabilize the system and maintain a steady state</p> Signup and view all the answers

<p>childbirth and milk production</p> Signup and view all the answers

<p>Positive feedback amplifies change, while negative feedback reduces change</p> Signup and view all the answers

<p>to promote plasticity of plant cell walls, allowing it to expand during elongation</p> Signup and view all the answers

<p>to promote stem and leaf growth upward and root growth downward</p> Signup and view all the answers

<p>through various types of tropism, such as phototropism, skototropism, and thigmotropism</p> Signup and view all the answers

<p>cold temperature, shorter day length, or dehydration</p> Signup and view all the answers

<p>protecting the plant against fungal and bacterial infections on site of injury</p> Signup and view all the answers

<p>when plants are exposed to herbivory</p> Signup and view all the answers

<p>causing hair to stand on end</p> Signup and view all the answers

<p>regulating body temperature</p> Signup and view all the answers

<p>protective layer covering the hair shaft</p> Signup and view all the answers