10 Questions
What is the term for the state of balance in the body?
Homeostasis
What is the term for animals whose body temperature fluctuates with the environment?
Ectotherm
What is the term for a response that intensifies a variable?
Positive Feedback
What hormone causes the liver to release glucose into the blood?
Glucagon
What is the term for a response that counteracts a variable to maintain homeostasis?
Negative Feedback
In a negative feedback system to regulate blood sugar, what is the role of the counteracting response?
Stabilize blood sugar levels
Which of the following animals is considered a warm-blooded 'Endotherm'?
Bird
What does hyperglycemia commonly lead to?
Diabetes
Why does the body of a cold-blooded 'Ectotherm' fluctuate with the environment?
To adapt to external conditions
What is the main function of Glucagon in the body?
Release glucose from the liver
Study Notes
Homeostasis
- Homeostasis is a state of balance, where the body maintains a stable internal environment despite changes in the external environment.
- Examples of homeostasis include:
- Maintaining blood pH level within a certain range.
- Regulating blood glucose levels within a certain range.
- Maintaining internal body temperature within a certain range.
Blood Sugar Regulation
- Hyperglycemia is a condition where blood glucose levels are too high, which can lead to diabetes.
- Hypoglycemia is a condition where blood glucose levels are too low, indicating a lack of insulin.
- Glucagon is a hormone that causes the liver to release glucose into the blood.
Thermoregulation
- Cold-blooded, or ectothermic, animals have body temperatures that fluctuate with the environment.
- Examples of cold-blooded animals include amphibians, reptiles, and insects.
- Warm-blooded, or endothermic, animals maintain a constant internal body temperature, regardless of the environment.
- Examples of warm-blooded animals include mammals and birds.
Feedback Mechanisms
- Negative feedback occurs when a variable triggers a counteracting response to maintain homeostasis.
- Examples of negative feedback include:
- Blood sugar regulation
- Temperature regulation
- Blood pressure regulation
- Positive feedback occurs when a variable intensifies a response, leading to an increase in the variable.
- Examples of positive feedback include:
- Childbirth
- Digestion
- Lactation
Variables
- A variable is a factor that can throw the body out of balance.
- Variables can trigger negative feedback mechanisms to maintain homeostasis.
Test your knowledge on homeostasis, hyperglycemia, hypoglycemia, cold-blooded and warm-blooded animals, and negative feedback mechanisms in the body.
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