introduction to human anatomy & physiology chapter 1
TRANSCRIPT
Introduction to Human Anatomy &
PhysiologyChapter 1
Questions since the beginning of time
How does the body work?
Study of the human body, both alive and cadavers
How does one treat injuries and illnesses?
Doctrine of Humors, Doctrine of Signatures, Trial & Error
How will herbs and potions help?
Trial & Error
Definitions
Anatomy – the study of the structures of the human body
Physiology – the study of the functions of the human body
Levels of organization
Levels of organization
Atoms
Molecules
Macromolecules
Organelles
Cells
Tissues
Organs
Organ systems
Human body
Characteristics of life
Movement
Responsiveness
Growth
Reproduction
Respiration
Digestion
Absorption
Circulation
Assimilation
Excretion
Maintaining life
Requirements for maintaining life
Requirements for maintaining life
Water
Food
Oxygen
Heat
Pressure
Water
Most abundant chemical in body
Required for many metabolic processes to take place
Important regulator of body temperature
Food
Provides the body with its necessary chemicals
As an energy source
As the building blocks for new matter
As a regulator for vital chemical reactions
Oxygen
Releases energy from food substances which can then drive other metabolic processes
Heat
A form of energy that is a byproduct of metabolic reactions
Amount of heat determines the rate at which reactions occur
The more heat; the more rapidly chemical reactions take place
Pressure
An application of force to something
Atmospheric pressure
The force on the outside of the body due to the weight of air
Important in the process of breathing
Hydrostatic pressure
The force exert by a liquid (ex. Blood pressure)
Important in the process of pushing blood through blood vessels
HomeostasisMaintaining a stable internal environment
Homeostasis
Our body only functions well when the concentrations of those requirements for maintaining life remain within certain narrow limits.
Homeostasis
1. Receptors – provides information about specific conditions in our internal environment
2. Set point – the particular value a necessary component of our body should be
3. Effectors – causes responses within the body that alter conditions in our internal environment
Homeostatic mechanisms(blood sugars)
Homeostatic mechanisms(body temperature)
Negative feedback
Once the values for the set point are brought back in line, the effectors are shut down
Seen in the previous two examples
Most common homeostatic mechanisms
Positive feedback
Once the values for the set point have been altered, the effectors continue working
Seen in the next two examples
Homeostatic mechanisms(Blood clotting)
Homeostatic mechanisms(Uterine contractions)
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Biology is a multidisciplinary science.
Campbell Biology, 9th edition (page 30)
Human anatomy and physiology is no different.