BIO 253 EXAM 1 EXAM 2025/2026 –
COMPLETE EXAM QUESTIONS AND
VERIFIED ANSWERS
Scientific Method - ANSWERObservation>Ask questions>Form hypothesis>Test the
prediction>Iterate: use the results to make new hypotheses and predictions
Anatomy - ANSWERfocuses on the body structures
Physiology - ANSWERfocuses on how various parts of the body function and interact
Levels of structural organization the hierarchy of complexity - ANSWERAtom>
Molecule> Macromolecule> Organelle>Cell>tissue>Organ>Organ system>Organism
Chemical level (hierarchy) - ANSWERincludes all the atoms and molecules in the body
Cellular level (hierarchy) - ANSWERthe base structural and functional unit of an
organism; the smallest self-contained unit of life; MOLECULES form CELLS
Tissue level (hierarchy) - ANSWERgroups of cells having the same basic structure,
function, and origin
receptors - ANSWERmonitor the environment send info about changes to the control
center
integrating center - ANSWERanalyzes information and sends response signals to the
effectors
effectors - ANSWERchange their activity based on signals in ordered ti produce a
change in the monitored condition
negative feedback - ANSWERreverses the direction of the original condition change. ex:
blood pressure, body temp, ion concentration
positive feedback - ANSWERintensifies enhances the condition change
ex: labor contractions, blood clotting etc
pathophysiology - ANSWERthe study of how body changes are related to disease
states
COMPLETE EXAM QUESTIONS AND
VERIFIED ANSWERS
Scientific Method - ANSWERObservation>Ask questions>Form hypothesis>Test the
prediction>Iterate: use the results to make new hypotheses and predictions
Anatomy - ANSWERfocuses on the body structures
Physiology - ANSWERfocuses on how various parts of the body function and interact
Levels of structural organization the hierarchy of complexity - ANSWERAtom>
Molecule> Macromolecule> Organelle>Cell>tissue>Organ>Organ system>Organism
Chemical level (hierarchy) - ANSWERincludes all the atoms and molecules in the body
Cellular level (hierarchy) - ANSWERthe base structural and functional unit of an
organism; the smallest self-contained unit of life; MOLECULES form CELLS
Tissue level (hierarchy) - ANSWERgroups of cells having the same basic structure,
function, and origin
receptors - ANSWERmonitor the environment send info about changes to the control
center
integrating center - ANSWERanalyzes information and sends response signals to the
effectors
effectors - ANSWERchange their activity based on signals in ordered ti produce a
change in the monitored condition
negative feedback - ANSWERreverses the direction of the original condition change. ex:
blood pressure, body temp, ion concentration
positive feedback - ANSWERintensifies enhances the condition change
ex: labor contractions, blood clotting etc
pathophysiology - ANSWERthe study of how body changes are related to disease
states
