What is the role of Positive Feedback in feedback mechanisms?
Amplifies change
Positive feedback mechanisms enhance or accelerate changes in a system.
What does Negative Feedback do in feedback mechanisms?
Counteracts change
Negative feedback mechanisms work to stabilize a system by reducing the output or activity.
Define Emergent Properties.
Complex abilities arising from interaction of simpler components
Emergent properties cannot be predicted by understanding the individual parts alone.
What is the Hierarchical Organization in multicellular organisms?
- Cell
- Tissue
- Organ
- Organ System
This organization shows how capabilities arise from the interaction of subsystems.
What are the three purposes of Hierarchical Organization?
- Efficiency
- Adaptability
- Resilience
Resilience allows functionality to continue even when one part fails.
What is an example of an emergent property in the Nervous System?
Muscle contraction
The nervous system coordinates various functions, including muscle contractions and gland secretions.
Fill in the blank: Interdependence means that all components in a multicellular organism rely on _______.
each other
This interdependence is crucial for the survival and functionality of the organism.
What does Specialization refer to in multicellular organisms?
The adaptation of cells to perform specific functions
Specialization allows different types of cells to contribute to the organism’s overall function.
Example of Positive Feedback
Childbirth
Oxytocin causes contractions - which triggers the release of more oxytocin
What is the primary function of the Circulatory System?
- Nutrient delivery
- Oxygen delivery
- Waste removal
The circulatory system acts as a transport network for essential substances.
What triggers the Fight-or-Flight Response?
Detection of threat by the Nervous System
The nervous system sends signals to the adrenal glands to initiate the response.
What do the adrenal glands release during the Fight-or-Flight Response?
Epinephrine
This hormone is distributed by the circulatory system to prepare the body for action.
Which part of the Nervous System is responsible for processing sensory information?
Central nervous system
It coordinates responses to sensory inputs.
Name the specialized receptors involved in sensory input.
- Visual Cortex
- Auditory Cortex
- Somatosensory Cortex
These areas process different types of sensory information.
What allows for parallel processing in the brain?
Simultaneous analysis of inputs
This shortens response time to stimuli.
What are the components of the endocrine system involved in the Fight-or-Flight Response?
- Hypothalamus
- Pituitary gland
- Adrenal glands
These components work together to regulate hormonal responses.
What is the role of the Medulla Oblongata?
Regulates autonomic functions
It controls vital functions such as breathing and heart rate.
Fill in the blank: The Cerebral Hemisphere is part of the _______.
Central nervous system
It plays a key role in higher brain functions.
What is the function of the spinal cord?
Acts as an interconnecting center for many unconscious processes, especially reflex actions
The spinal cord facilitates communication between the brain and the body.
What are the two types of matter found in the spinal cord?
- White matter
- Grey matter
White matter contains myelinated axons, while grey matter contains cell bodies of neurons.
What is a reflex arc?
A neural pathway that controls a reflex action
It includes receptors, sensory neurons, interneurons, and motor neurons.
Fill in the blank: The reflex arc includes a receptor, sensory neuron, ________, and motor neuron.
interneuron
Interneurons communicate with the brain for more complex responses.
What are the pathways involved in the reflex arc?
- Ascending pathways to the brain
- Descending pathways from the brain
These pathways facilitate communication between the brain and body.
What do sensory neurons do?
Transmit sensory information to the brain for processing
They play a crucial role in generating conscious responses.
