General Biology: Lesson 4.1

• Messages


  must be generated, delivered, and interpreted and acted upon by the assigned organ system
• -Endocrine System -Nervous System


  Two main organ systems responsible for the body's communication network
• Endocrine System and Nervous System


  allow you to respond to the environmental stimuli all throughout your lives.
• Evaporation of water

  helps regulate body temperature
• Kidneys

  maintain water balance
• Blood


  distributes heat throughout the body
• Hypothalamus

  regulates temperature and changes in osmotic pressure
• Pancreas

  regulates blood sugar
• Skeletal Muscles

  contract and releases heat
• Homeostasis


  require the interaction of regulatory mechanisms of the nervous and endocrine systems to maintain internal equilibrium in important life processes
• Nervous System


  composed of physically connected networks of nerve cells, tissues and organs that control your thought, senses and movement, as well as many of your lifes bodily functions such as BREATHING
• Endocrine System


  is a collection of physically disconnected glands that also help in various body processes such as growth, development, and responding to external stimuli.
• Stimulus


  cause or elicit a response from the organism
• -Chemical -Cellular -Behavioral Responses


  In living systems, a stimulus usually triggers a change in an individual, which may be in the form of
• Involuntary


  Not under your control such as breathing, blinking your eyes, and sneezing
• Voluntary


  Under your control
• Bloodstream


  The chemical signals (hormone) of the endocrine system are carried out via ________, and only cells with special receptors can accept the signal.
• Nervous System


  must send its signal through a physical network of specialized nervous tissues and organs
• -Body temperature -Blood Chemistry


  a part of the endocrine function also deals with regulating bodily processes such as