Chapter 1 Flashcards
Study of the structure of body parts and their relationship to one another
Anatomy
Study of the function of body parts
Physiology
Study of large visible structures
Gross (microscopic anatomy)
All structures in a particular area of the body
Regional anatomy
Just one system
System anatomy
Internal structures as they relate to overline skin (visible muscle masses or veins seen on surface)
Surface anatomy
Microscopic anatomy
Structures too small to be seen by naked eye
Microscopic study of cell
Cytology
Microscopic study of tissues
Histology
Studies anatomical and physiological development throughout life
Developmental anatomy
Study of development before birth
Embryology
Based on organ systems
Often focuses on cellular and molecular levels of the body
Looks at how the bodies of abilities are dependent on chemical reactions in individual cells
Subdivisions of physiology
Human body is very organized from the smallest chemical level to whole organism level
Structural organization
Atoms ,molecules and organelles
Chemical level
Single cell
Cellular level
Groups of similar cells
Tissue level
Contains two or more types of tissue
Organ level
Organs that work closely together
Organ system level
All organ systems combined to make the whole organism
Organismal level
Anatomy and physiology are inseparable
Function always reflects structure
What structure can do depends on its specific form
Principle of complementarity of structure and function
Maintenance of life involves:
Maintaining boundaries
Movement
Responsiveness
Digestion
Metabolism
Excretion
Reproduction
Growth
Necessary life functions
Nutrients
Oxygen
Water
Normal body temperature
Appropriate atmospheric pressure
Survival needs
Plasma membrane separate cells
Skin separates organism from environment
Maintaining boundaries
Muscular system allows movement
Contractility refers to movement at the cellular level
Movement
Ability to sense and respond to stimuli
Responsiveness
Breakdown of ingested. Followed by absorption of simple molecules into blood.
Digestion
All chemical reactions that occur in body cell
Metabolism
Breakdown of molecules
Catabolism
Synthesis of molecules
Anabolism
Removal away from metabolism and digestion
Excretion
At the cellular level involves division of cells for growth or repair
At the organismal level, is the production of offspring
Reproduction
Increase in size of a body part or of organism
Growth
Chemical for energy and cell building
Nutrients
Major source of energy
Carbohydrates
Needed for cell building and cell chemistry
Protein
Long-term energy storage
Fats
Involved in chemical reactions as well as for structural purposes
Minerals and vitamins
Central for release of energy from foods
Oxygen
Most abundant chemical in body provides the watery environment for chemical reactions
Also is fluid base for secretion and excretion
Water
A body temp falls below or goes above 37°C rates of chemical reactions are affected
Normal body temperature
Specific pressure of air is needed for adequate breathing and gas exchange in lungs
Appropriate atmospheric pressure
A dynamic state of equilibrium, always be adjusting as needed.
Maintained by contributions of all organ systems
Homeostasis
Factors that can change ( blood sugar, body, temperature, blood, volume, etc.)
Variables
monitors environment
Response to stimuli
Receptor
Determines setpoint at which variable is maintained
Receives input from receptor
Determines appropriate response
Control center
Receives output from control center
Provides the means to respond
Response either reduces stimulus or enhance a stimulus
Effector
Most used feedback mechanism in body
Respond reduces or shuts off original stimulus
Example: regulation of body temperature
Negative feedback
Response enhances, or exaggerates the original stimulus
May exhibit a cascade or amplifying effect as feedback causes variable to continue in same direction as initial change
Example: enhancement of labor contractions by oxytocin
Positive feedback
Disturbance of homeostasis
Increases risk of disease
Control systems become less efficient
Homeostatic imbalance