Endocrine System Notes
Stimulus
A. _______________________ Any change in an organism’s environment.
2 Types of Stimuli
External
1._______________________________ come from things found outside the organism.
Ex- predators, light, sound, and temperature of the environment
Internal
2. _______________________________ comes from things within an organism
being hungry, being thirsty, feeling tired, pain
Ex-
Response
B. _____________________ An organisms reaction to change (stimulus).
Ex: When someone jumps out and scares you. How would you react?
Fight or Flight
C. ________________________________ An organisms biological response to extreme
stress.
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Can include• Increased heart and breath rate
• Shaking
• Adrenaline rush- extreme strength
• Frozen in place (cannot move)
The Endocrine System
The nervous system is considered a REGULATORY system because it helps the body maintain
_____________________________
Homeostasis
Regulatory
The endocrine system is another __________________________system.
Homeostasis
A. ___________________ is the condition in which an organism keeps its internal state fairly
constant. Examples:
1. A person’s body temperature rises, the person begins to sweat.
2. A person’s body needs glucose, the person becomes hungry.
What is the role of the Endocrine System?
glands
hormones
1. Made up of ______________that produce and secrete __________________.
2. Hormones control many daily activities and long - term changes.
**Hormones help regulate the body’s growth, metabolism, immune system, stress and
emergency response, and sexual development and function.
What is a hormone?
chemical messengers
1. Hormones are ________________________created by the body. They turn on, turn
off, speed up, or slow down the activities of different organs and tissues.
transfer information
2. They _______________________________from one set of cells to another to
coordinate the functions of different parts of the body.
Adrenal Glands
1. Located at the top of each kidney
2. ****Release the hormone adrenaline
3. Release other hormones that affect the balance of salt and water in the
kidneys
4. Help control the amount of sugar in the blood
How do plants respond?
Plant Tropisms
Tropism = a plant’s growth responses toward or away from a stimulus
Positive tropism
Negative tropism
1. ______________________ = plant grows toward a stimulus
2. ______________________ = plant grows away from a stimulus
A._________________________ Growth response to light
Phototropism
EX: Plants bend towards light
Geotropism
B.____________________________ Growth response to gravity
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Positive: plant roots grow down
Negative: stems grow up against gravity and out of the soil.
Turgor Pressure
Turgur Pressure –
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Plants store water in their vacuole and in the cytoplasm.
When plants don’t have enough water they wilt.
When plants have enough water it stands up tall.
Plants store water in their vacuole and in the cytoplasm.
When plants don’t have enough water they wilt.
When plants have enough water it stands up tall.