Unit 10 Review: Homeostasis. What is a stimulus?

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Presentation transcript:

Unit 10 Review: Homeostasis

What is a stimulus?

What is a stimuli? Things that cause an organism to perform an activity or start a reaction. (the cause)

What is an external stimulus?

Things that cause an organism to perform an activity or start a reaction that happen outside an organism’s body.

Give 2 examples of an external stimuli.

Heat, moisture, cold, etc.

What is an internal stimulus?

Things that cause an organism to perform an activity or start a reaction that happen within the body.

Give 2 example an internal stimuli.

Glucose, bacteria, virus, etc.

INTERNAL OR EXTERNAL STIMULI? A.You forgot to eat breakfast, so you are tired.

INTERNAL OR EXTERNAL STIMULI? A.INTERNAL

INTERNAL OR EXTERNAL STIMULI? A.Mealworms don’t like the sun, so they move into the shade.

INTERNAL OR EXTERNAL STIMULI? A.EXTERNAL

INTERNAL OR EXTERNAL STIMULI? A.What type of stimulus is having a fever? INTERNAL or EXTERNAL?

INTERNAL OR EXTERNAL STIMULI? A.INTERNAL

Review A.What type of stimulus is vomiting? INTERNAL or EXTERNAL?

Review A.What type of stimulus is vomiting? INTERNAL

Review A.What type of stimulus pupil dilation? INTERNAL or EXTERNAL?

Review A.What type of stimulus pupil dilation? EXTERNAL

What is a response?

What occurs in response to the stimuli (the effect).

What is homeostasis?

The body's ability to maintain a stable balanced state of healthy function.

What are some internal stimuli for the response “vomit”?

Food poisoning, Illness, feeling nervous or scared, eating too much, pregnancy, and motion sickness are some reasons.

What is another name for your body’s “thermostat”?

The hypothalamus is in the center of the brain and acts as the body’s thermostat.

What is a pyrogen?

Pyrogens are fever-producing substances that usually come from a source outside the body such as viruses, bacteria, fungi, drugs, and toxins. Examples of pyrogens are colds, the flu, tonsillitis, ear infections, bronchitis, and tetanus.

What is a tropism?

The way a plant grows in response to a stimuli.

What is the stimuli in phototropism?

Growth in response to Light

Draw phototropism, complete with arrows for positive and negative phototropism.

Roots exhibit negative phototropism while stems and leaves exhibit positive phototropism.

What is the stimuli in geotropism?

Growth in response to Gravity

Draw geotropism, complete with arrows for positive and negative geotropism.

Roots exhibit positive geotropism while stems and leaves exhibit negative geotropism.

What is the stimuli in thigmotropism?

Growth in response to touch

Draw thigmotropism, complete with arrows for positive and negative thigmotropism.

Roots exhibit negative thigmotropism while stems and leaves exhibit positive thigmotropism.

What is the stimuli in hydrotropism?

Growth in response to water

Draw hydrotropism, complete with arrows for positive and negative hydrotropism.

Roots exhibit positive hydrotropism.

What is the stimulus for transpiration?

Water – an internal stimulus.

What is torpor?

Torpor - deep sleep, but usually part of the day. Time of sleep depends on animal.

What is estivation?

Estivation – Sleep to escape environment. Body slows down to not need food/water. Reptiles are a good example.

Give an example of a structural adaptation in order to maintain homeostasis.

Claws, Mimicry, etc.

Give an example of a behavioral adaptation in order to maintain homeostasis.

Migration, Hiberation, caring for young etc.

What are the 2 types of behavioral adaptations?