Q4: Chemical & Nervous Control Flashcards
It is a physiological regulatory system that either returns the body to a normal internal state (homeostasis) or, less commonly, brings an internal system further away from homeostasis, like having fever.
feedback mechanism
Feedback that is used to make a response stronger until it reaches a set point.
Positive Feedback Mechanism
It is used to make an excessive response weaker until it reaches a set point.
Negative Feedback Mechanism
True or False
An example of positive feedback mechanism is blood glucose management.
False
Parts of Feedback System
- Receptor
- Control center
- Effector
It receives information and sends this to the control center.
receptor (or sensor)
It processes receptor information and stimulates the effector.
Control center: (or evaluator)
It carries out a stimulatory or inhibitory effect according to control center instructions.
Effector
It refers to the stable state of the inner environment of organisms.
homeostasis
It occurs when homeostatic systems fall short, which could lead to harmful wastes building up in the body or cells not receiving all the nutrients they require.
homeostatic imbalance
The human body’s temperature regulatory center.
hypothalamus
Examples of Plant Regulations
- Water Loss
- Sunlight
- Flower Production
- Fruit Production
- Abscission
Dilation of blood vessels to allow more blood from the warm body core to flow close to the surface of the body, so heat can be radiated into the environment.
vasodilation
Activation of sweat glands to increase their output of sweat.
diaphoresis
The contraction of blood vessels to prevent blood from flowing close to the surface of the body.
vasoconstriction
