**Homeostasis** is the process by which the body maintains a constant internal environment, despite changes in the external environment. This is crucial for an organism's survival
Steps in a negative feedback mechanism
1️⃣ Receptors detect a change
2️⃣ Control center processes information
3️⃣ Effectors reverse the change
Positive feedback mechanisms are less stable compared to negative feedback.
True
A negative feedback mechanismreduces or reverses a change in the body's internal environment to maintain homeostasis
**Positive feedback mechanisms** enhance changes in the body’s internal environment, pushing it further away from its set point
Positive feedback mechanisms are highly stable.
False
Positive feedback mechanisms amplify changes in the body’s internal environment, pushing it further away from its set
In a positive feedback loop, receptors detect a change
Childbirth is an example of a positive feedback mechanism.
True
Receptors in the skin and hypothalamus detect changes in body temperature.
True
Where are the receptors for blood glucose control located?
Pancreas
Match the control system with its receptors:
Temperature Regulation ↔️ Skin, Hypothalamus
Blood Glucose Control ↔️ Pancreas
Which hormone raises blood glucose levels?
Glucagon
Match the hormone with its role in homeostasis:
Insulin ↔️ Lowers blood glucose
Glucagon ↔️ Raises blood glucose
Thyroxine ↔️ Regulates metabolic rate
Why is homeostasis crucial for survival?
Vital processes function optimally
A negative feedback mechanism ensures conditions stay within a narrow, healthy range
What is a negative feedback mechanism in homeostasis?
Reverses changes in environment
Effectors in a negative feedback mechanism, such as insulin production, help to lower blood sugar
What is the role of insulin in blood glucose control?
Lowers blood sugar
What is a positive feedback mechanism in homeostasis?
Amplifies changes in environment
Positive feedback loops push the body further away from its set point.
True
How does oxytocin contribute to childbirth in a positive feedback loop?
Strengthens uterine contractions
Negative feedback mechanisms are less stable compared to positive feedback mechanisms.
False
In temperature regulation, the control center is located in the hypothalamus
The pancreas detects changes in blood glucose levels.
True
What is the primary function of homeostatic control systems?
Maintain stable internal conditions
Receptors in the skin and hypothalamus detect changes in body temperature
Receptors in the pancreas detect changes in blood glucose levels
True
Match the control system with its receptors, control centre, and effectors:
Temperature Regulation ↔️ Skin, Hypothalamus, Hypothalamus, Sweat glands
Blood Glucose Control ↔️ Pancreas, Pancreas, Liver cells
Homeostasis ensures vital processes function within an optimal range.
True
A homeostatic control system has three main components: receptors, control center, and effectors
Match the component with its role in a homeostatic control system:
Receptors ↔️ Detect changes in the internal environment
Control Centre ↔️ Processes information from receptors
Effectors ↔️ Respond to instructions from the control centre
A negative feedback mechanism reduces or reverses a change in the body's internal environment to maintain stability
Negative feedback systems bring conditions back to the set point.
True
Positive feedback mechanisms amplify changes in the body’s internal environment, pushing it further away from its set point
Match the type of feedback with an example:
Positive Feedback ↔️ Childbirth
Negative Feedback ↔️ Blood sugar regulation
Negative feedback systems counteract deviations from the set point.
True
Steps in a positive feedback loop
1️⃣ Receptors detect a change
2️⃣ Control center processes information
3️⃣ Effectors increase the deviation
Positive feedback mechanisms reduce stimulus rather than increase it.
False
Steps in a positive feedback loop
1️⃣ Receptors detect a change
2️⃣ The control center processes the information
3️⃣ Effectors increase the deviation from the set point