Internal and External 7 13 AB.notebook October 23, 2015

External & Internal Stimuli7.13 A,B

Internal and External 7 13 AB.notebook October 23, 2015

Internal and External 7 13 AB.notebook October 23, 2015

Your body likes to stay in balance (homeostasis). When you are out of balance your body's systems will work together to bring you back into balance.

Internal and External 7 13 AB.notebook October 23, 2015

External Stimuli­ occurs outside the organism

Stimulus Response

when it's hot outside go in or seek shade feeling cold in class put on a jacket; seeing a spider scream:), run away

Bright outside squint/close eyes

see something gross cringe; gag

see stranger danger run away, hide

What's a common RESPONSE?

What's a common RESPONSE?

What's a common RESPONSE?

What's a common RESPONSE?

What's a common RESPONSE?

What's a common RESPONSE?

Internal Stimuli­ occurs from INSIDE organism itself (Ex. fever, vomiting, watery eyes, sneeze, wilting plant)

Stimulus Response

get a virus fever, vomiting

eat rotten food vomiting, diarrhea

stomach cramps pain, less activity

body dehydrated thirst

not enough sleep tired

plant not watered less growth, wilting

What's a common RESPONSE?

What's a common RESPONSE?

What's a common RESPONSE?

What's a common RESPONSE?

What's a common RESPONSE?

What's a common RESPONSE?

Internal and External 7 13 AB.notebook October 23, 20157.13 BLiving organisms are able to maintain a constant

internal balance using processes to adjust to stimuli in the environment. All of the following are examples of internal processes used by living organisms to maintain balance except

A the fluid in the inner ear canals detecting sensations of movement

B the pupil of the eye shrinking in bright light, and getting larger in dim light

C sweating when body temperature rises

D turning on a fan

Answer: D

7.12 DWhich of the following is NOT correct

about the cytoplasm within cells?

A It helps dissolve cellular wastes.

B It appears as a gel­like liquid water surrounding the organelles in the cell.

C It holds components that help move materials around the cell.

D It is only found in animal cells.

Answer: D

Internal and External 7 13 AB.notebook October 23, 20157.13 B

A scavenger eats a diseased, rotting

animal. After eating the animal, the

scavenger feels sick and nauseated.

This feeling of nausea is an —

A external stimulus telling the scavenger to eat only plants in the future.

B external stimulus telling the scavenger to never eat diseased animals again.

C internal stimulus telling the scavenger to tolerate the sick feelings.

D internal stimulus telling the scavenger to get rid of food that is dangerous for it.

Answer: D

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