Nervous System

H. Biology

How Organ Systems Communicate

Section 29.1

Students will be able to Explain that the nervous system and the endocrine system provide the means by which organ systems communicate.

Bellringer1) Name a few ways that you communicate.2) Hypothesize what you think accounts for

the different colors in the MRI scan?

Students will be able to Explain that the nervous system and the endocrine system provide the means by which organ systems communicate.

1) Name a few ways that you communicate.Speech Body language Touch Written language

2) What do you think accounts for the different colors in the MRI scan?Brain scans are used to study the structure of the brain and to identify brain abnormalities. Scans can also be used to study brain activity associated with thinking, which occurs in the front part of the brain.

•Red•Blue•White•Green •Yellow•Orange•Brown•Black

Memorize this list of colors:

•Magenta•Opal•Aquamarine•Violet•Cyan•Taupe•Ebony•Teal

Memorize this list of colors:

•Which list were you able to recall better?

•Why do you think?

• Which list were you able to recall better?–Probably the 1st

• Why do you think?–Probably because the words on the

first list were more familiar.

Take a minute to think about these questions:

• How do you know you are hungry?• How do you know you are hot? • Do you tell yourself to sweat?• Do you tell yourself to grow?• Do you actively need to tell yourself to digest your

food?• Do you decide what temperature your body is?

• Your brain lets you think and move. It controls digestion, heart rate, and body temperature. Your brain does these things with help from the endocrine system and the rest of the nervous system.

How organ systems communicate• The nervous system and endocrine system are the

communication networks that allow you to respond to changes in your environment countless times each day-maintaining homeostasis.

• Nervous system: controls thoughts, movement, emotion, and simpler life processes, such as swallowing.▫ For example: when you walk outside on a sunny day,

your nervous system senses the bright light coming to your eyes and sends a message that tells your pupils to shrink and let in less light.

• Endocrine system: controls growth, development, digestion and responses to environment, such as body temperature. ▫ For example: when you are outside on a hot day,

endocrine system responds by producing messages that tell your body to sweat more to cool down.

Different Rates of Communication• The nervous system and endocrine systems have

different methods and rates of communication. ▫ Your endocrine system works slowly, such as hair growth, aging,

and sleep patterns. Only chemical signals Signals move through bloodstream Physically unconnected organs For example: as the day warms up, your endocrine responds by

releasing chemicals that stimulate sweat glands. SLOW RESPONSE.

• Works like a satellite system

• Sends signals in all directions, but you need special receivers to get the signals

• Your endocrine system’s chemical signals are carried by the bloodstream

• only cells with certain receptors can receive the signals

Different rates of communication… • Nervous system works quickly and controls immediate

processes, such as heart rate and breathing. If you touch your hand to a hot stove, an immediate response from the nervous system causes you to jerk your hand away.

• Signals move from your skin on your hand to the muscles in your arm by passing through the two parts of the nervous system: the central and peripheral.

• The central nervous system (CNS) includes the brain and spinal cord.

• The peripheral nervous system (PNS) is a network of nerves that transmits messages to the CNS.

•Like cable television•A physical wire

connects your TV. to the cable provider

• Your nervous system sends its signals through a network of specialized tissues

The body’s communication systems help maintain homeostasis.

•A stimulus causes a response. ▫Responses can be

chemical, cellular, or behavioral.

▫The nervous and endocrine systems respond to stimuli.

Both systems let you respond to a stimulus in your environment and maintain homeostasis. •What stimuli cause you to sweat and cause your pupils to shrink?•What stimuli causes your body hair to stick up and your body to shiver?

Exit Slip (Assignment): 1) Draw a Venn Diagram comparing and contrasting

the nervous system and the endocrine system.2) Think of 3 real life examples of how the nervous

system and endocrine system work in your daily life. (Think of the examples given in lecture).

3) Make your own analogy comparing the nervous system and endocrine to another system/object/etc and explain. Example: nervous system=cable television; endocrine system=satellite system.