Name______Class______Date______
Section 1: How Organ Systems Communicate
Study Guide 29-1
Key Concept
The nervous system and the endocrine system provide the means by which organ systems communicate.
Vocabulary
nervous system / central nervous system (CNS) / stimulusendocrine system / peripheral nervous system (PNS)
MAIN IDEA: The body’s communication systems help maintain homeostasis.
Circle the letter of the word or phrase that best completes the sentence.
1.Your body’s ability to maintain ______depends on the ability of different systems in your body to communicate with one another.
a.stimulus
b.nervous
c.homeostasis
d.endocrine
2.The ______system is a collection of physically disconnected organs that helps control growth, development
a.stimulus
b.nervous
c.homeostasis
d.endocrine
3.A ______causes a chemical, cellular, or behavioral change in an organism.
a.stimulus
b.response
c.homeostasis
d.endocrine
4.The ______system is a physically connected network of cells, tissues, and organs that controls thoughts, movements, and simpler life processes.
a.stimulus
b.nervous
c.homeostasis
d.endocrine
© Houghton Mifflin Harcourt Publishing Company.
Holt McDougal Biology1Nervous and Endocrine Systems
Name______Class______Date______
Study Guide A continued
The phrases below describe how your eye responds when it is suddenly exposed to bright sunlight. Place a number beside each phrase to indicate the correct sequence of events.
5. ______The nervous system sends messages to the muscles surrounding the pupil of the eye.
______The nervous system senses bright light entering the eye.
______Bright light enters the eye.
______Muscles contract to shrink the pupil and let in less light.
MAIN IDEA: The nervous and endocrine systems have different methods and rates of communication.
Fill in the blank with name of the systemthat best completes the sentence.
6.The ______system includes the brain and spinal cord.
7.The ______system works quickly and controls processes that occur over short periods of time.
8.The ______system works slowly and controls processes that occur over long periods of time.
9.The ______system transmits messages to and from the central nervous system.
Vocabulary Check
Use the vocabulary terms from this section to complete the sentence.
10.You jump when you hear a nearby truck honk its horn. In this example, the honking horn is the ______.
11.The ______sends chemical signals through the bloodstream.
12.When your brain wants to make your legs move so that you can run, the ______carries the message from your spinal cord to your leg muscles.
13.Your ______is the communication system that sends its signals through a highly connected network of specialized cells and tissues.
© Houghton Mifflin Harcourt Publishing Company.
Holt McDougal Biology1Nervous and Endocrine Systems