Edexcel Biology (B1) Topic 2

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Responses to a Changing Environment.
Topic 2
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What is Homeostasis?
Keeping the Internal Environment Constant.
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What is Osmoregulation?
The Control of Water in the Body.
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How Do We Lose Water From our Body.
Urine, Breath and Sweat.
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What is Thermoregulation?
The Control of Body Temperature.
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What Happens if the Body Goes Below 37°C?
Shivering, Erection of Hairs and Vasoconstriction.
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What is Vasoconstriction?
The Blood Vessels Narrow and the Blood Flow to the Skin Reduces. Less Heat is Lost.
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What Happens if the Body Goes Above 37°C?
Sweating, Hairs Lie Flat and Vasodilation.
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What is Vasodilation?
The Blood Vessels Widen and the Blood Flow to Skin Increases. More Heat is Lost.
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What Type of Feedback is Thermoregulation?
Negative?
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What is a Hormone?
A Chemical Released By Glands.
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What is a Target Organ?
An Organ That Response to a Hormone?
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What Carries the Hormones in the Body?
The Blood.
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Why is Glucose Needed?
To Help With Respiration.
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What Organ Produces Insulin?
The Pancreas.
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What Happens if Blood Glucose is Too High?
Insulin is Secreated into the Blood, Liver converts Glucose into Glycogen and the Glucose Level Goes Up.
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What Happens if Blood Glucose is Too Low?
Insulin isn't Secreated into the Blood, Liver Doesn't converts Glucose into Glycogen and the Glucose Level Goes Down.
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What Other Hormone Does the Pancreas Release?
Glucagon.
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What Does Glucagon Do?
Causes the Liver to Turn Glycogen Back into Glucose.
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What Causes Diabetes?
The Blood Glucose Levels Being Too High.
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How is Type 1 Diabetes Controlled?
Monitoring Diet and Injecting Insulin.
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How is Type 2 Diabetes Controlled?
Monitoring Diet and Excercise.
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What is the Formula For BMI?
Weight in KG/Height in M^2.
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What Do Plants Need For Photosynthesis?
Light and Water.
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Positive Tropism?
Towards the Stimulus.
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Negative Tropism?
Away From the Stimulus.
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Phototropism?
Growth to the Direction of Light.
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Geotropism?
Growth to the Direction of Gravity.
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What is Auxin?
A Plant Hormone Which Causes the Elongation of Cells in Plants.
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What is Selective Weedkiller?
A Weedkiller That Kills Certain Plants By Speeding Up the Rate of Growth.
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What is Rooting Powder?
A Powder That Makes Stem Cuttings Develop Roots Quicker.
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Why Are Some Hormones Used for Delaying Ripening?
For Transport and shop Displaying.
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What Are the Sense Organs?
Skin,Tounge, Nose, Eyes and ears.
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Skin Receptors Are?
Touch, Pressure, Pain and Temperature.
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Tounge Receptors Are?
Chemicals in Food.
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Nose Receptors Are?
Chemicals in the Air.
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Eye Receptors Are?
Light.
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Ear Receptors Are?
Sound and Head Positioning.
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What is an Effector?
Part of the Body That Produces the Responce.
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What are Neurones?
Nerve Cells.
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Type of Neurones?
Sensory, Relay and Motor.
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What Does a Sensory Neuron Do?
Carries Signals From Receptors to the Spinal Cord and Brain.
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What Does a Relay Neurone Do?
Carries Messages From One Part of the CNS to Another.
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What Does a Motor Neurone Do?
Carries Signals From the CNS to Effectors.
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What Surrounds the Axon?
Myelin Sheath.
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What is a Synapse?
The Gap In Between Where Two Neurones Meet.
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What Happens When a Receptor is Stimulated?
Receptor Detects the Environmental Change, Sensory Neurone Sends Signal to Relay Neurone, Motor Neurone Sends Signal to Effector and Effector Produces a Response.
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Other cards in this set

Card 2

Front

What is Homeostasis?

Back

Keeping the Internal Environment Constant.

Card 3

Front

What is Osmoregulation?

Back

Preview of the front of card 3

Card 4

Front

How Do We Lose Water From our Body.

Back

Preview of the front of card 4

Card 5

Front

What is Thermoregulation?

Back

Preview of the front of card 5
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