What are the three distinct branches of the United States government?
- Legislative Branch
- Executive Branch
- Judicial Branch
Each branch has specific powers and responsibilities to check the powers of the others, ensuring a balance of power.
Define homeostasis.
A dynamic, ever-changing situation where physiological mechanisms maintain a fairly constant internal environment
Homeostasis is crucial for the well-being of the individual.
What are the basic components of a control system in homeostasis?
- Detector
- Control centre
- Effector
These components work together to maintain physiological variables within narrow limits.
True or false: Positive feedback mechanisms are more common than negative feedback mechanisms in the body.
FALSE
Negative feedback mechanisms are the primary means of maintaining homeostasis.
What is the function of nerve cells?
To transmit electrical signals (nerve impulses)
This function allows for rapid and sophisticated communication within the body.
Fill in the blank: The human body is composed of several systems that work __________.
interdependently
Each system has a specific function that is essential for health.
What are the levels of structural complexity within the body?
- Chemical level
- Cellular level
- Tissue level
- Organ level
- System level
These levels illustrate the organization of the body from atoms to the whole organism.
What is anatomy?
The study of the structure of the body and the physical relationships between its parts
Anatomy provides a foundation for understanding physiology.
What is physiology?
The study of how body systems work and maintain life
Physiology examines the integrated activities of body systems.
What is pathology?
The study of abnormalities in body functions
Pathophysiology considers how these abnormalities affect health.
List some physiological variables maintained by homeostatic control mechanisms.
- Core temperature
- Water and electrolyte concentrations
- pH of body fluids
- Blood glucose levels
- Blood pressure
These variables are crucial for maintaining homeostasis.
What is the internal environment of the body?
The water-based medium in which body cells exist
Cells absorb oxygen and nutrients from the surrounding interstitial fluid.
What is the role of the plasma membrane?
Provides a selective barrier to substances entering or leaving the cell
This property is known as selective permeability.
What happens during negative feedback?
Any movement away from the normal set point is negated or reversed
This process helps maintain homeostasis.
What are the examples of positive feedback mechanisms?
- Blood clotting
- Uterine contractions during childbirth
These mechanisms amplify the response to a stimulus.
What is the function of the digestive system?
To process food and absorb nutrients
The stomach is one of several organs involved in this system.
What is the function of the cardiovascular system?
To transport substances around the body
This system includes blood and blood vessels.
What are the body activities related to the survival need of communication?
- Internal communication (nervous and endocrine systems)
- External communication (special senses, verbal and non-verbal)
Communication is essential for maintaining homeostasis.
What is the function of the skin?
Provides protection against the external environment
The skin is a critical barrier for the body.
What is the function of blood?
Transports nutrients, oxygen, hormones, and waste materials
Blood consists of plasma and blood cells.
What are the three distinct groups of blood cells?
- Red blood cells
- White blood cells
- Platelets
Each group has specific functions in the body.
What are the three distinct groups of blood cells classified according to?
Their functions
Blood cells play crucial roles in various bodily functions.
List the roles of the body transport systems.
- Oxygen absorption from the lungs
- Chemical substances synthesized by body cells (e.g., hormones)
- Waste materials produced by cells for elimination
These roles are essential for maintaining homeostasis and overall health.
What systems are outlined for internal communication in the body?
- Nervous system
- Endocrine system
These systems coordinate bodily functions and responses.
