A/P Chapter 1 Major Themes of Anatomy and Physiology

Anatomy

The study of form.

Dissection

The process of cutting apart; essential for anatomical study.

Comparative anatomy

The study of the structural bodies of more than one species to examine similarities, differences, and evolutionary trends.

Exploratory surgery

Opening the body and looking inside to see what is wrong; now largely replaced by medical imaging.

Radiology

The branch of medicine concerned with imaging the body.

Gross anatomy

The study of structures that can be seen with the naked eye without magnification.

Histology

The microscopic observation and study of tissue specimens.

Histopathology

The microscopic study of tissues specifically looking for signs of disease.

Cytology

The scientific and microscopic study of individual cells.

Ultrastructure

The fine, detailed structural features of tissue revealed by an electron microscope.

Physiology

The study of function.

Comparative physiology

The study of the biological functions of different species, often serving as the basis for new drugs and medical procedures.

Hippocrates

The "father of medicine" who established a code of ethics and urged physicians to seek natural causes for disease rather than attributing them to gods or demons.

Aristotle

Greek philosopher who believed diseases could have either supernatural (theologi) or natural (physioci) causes, and argued that complex structures are built from simpler parts.

Claudius Galen

Roman physician who wrote a highly influential medical textbook based on animal dissections (since human dissection was banned), warning that his own books could be wrong.

Andreas Vesalius

The anatomist who broke with tradition by coming down from the cathedra to do dissections himself; published the first accurate gross anatomy atlas (De Humani Corporis Fabrica) in 1543.

William Harvey

English physician famous for his pioneer work on blood circulation, realizing that blood pumps from the heart and back to it.

Michael Servetus

Along with William Harvey, one of the first Western scientists to realize that blood must circulate continuously through the body, starting with the lungs.

Robert Hooke

English scientist who improved the compound microscope (adding a stage, stage clips, and focus controls) and coined the term "cellulae" after looking at cork.

Antony van Leeuwenhoek

Dutch textile merchant who invented the single-lens microscope and discovered microorganisms ("animalcules") in a drop of rainwater.

Matthias Schleiden

Botanist who, alongside Theodor Schwann, concluded that all organisms are composed of cells, laying the foundation for modern cell theory.

Theodor Schwann

Zoologist who, alongside Matthias Schleiden, concluded that all organisms are composed of cells, laying the foundation for modern cell theory.

Scientific method

A set of disciplined standards and habits of mathematical, taxonomic, and experimental inquiry used to ensure reliable observations.

Baconian / Inductive method

A process of making numerous observations until one can confidently draw a generalization or prediction from them.

Hypothetico-deductive method

A scientific technique where an investigator formulates a hypothesis as a tentative answer and then deduces conclusions to test and support or refute it.

Hypothesis

An educated speculation or possible answer to a question, which must be consistent with what is already known and capable of being tested and falsified.

Falsifiability

A principle of scientific hypotheses stating that there must be a way to specify what evidence would prove the hypothesis wrong.

Sample size

The number of subjects used in an experimental study; an adequate sample size controls for chance events and individual variations.

Control group

A group of experimental subjects that is as similar as possible to the treated group but does not receive the variable being tested.

Psychosomatic effects

Effects of a subject's state of mind on their physiology; controlled in experiments using a placebo.

Placebo

An inactive substance or fake treatment given to a control group to isolate the true effects of an experimental variable.

Experimenter bias

The conscious or unconscious tendency of an investigator to affect the results of their own study; guarded against using the double-blind method

Double-blind method

An experimental control where neither the subject nor the person giving the treatment knows whether a subject is in the experimental or control group

Peer review

A critical evaluation of scientific work by other experts in the same field before it is published, ensuring honesty, objectivity, and quality

Scientific fact

Information that can be independently verified by any trained person

Law of nature

A generalization about the predictable way in which matter and energy behave, based on consistent inductive reasoning and repeated observations

Theory

An explanatory statement or set of statements derived from facts, laws, and confirmed hypotheses

Charles Darwin

The naturalist who studied evolution and proposed natural selection as the primary mechanism for how species change over time

Evolution

A change in the genetic composition of a population of organisms over generations

Natural selection

The evolutionary mechanism where individuals with hereditary advantages survive and pass those traits to their offspring

Selection pressures

Environmental forces (like climate, predators, or disease) that promote the reproductive success of some individuals over others

Adaptations

Features of anatomy, physiology, and behavior that evolve in response to selection pressures and enable an organism to cope with its environment

Arboreal environment

The treetop habitat of early primate ancestors, which selected for traits like opposable thumbs, stereoscopic vision, and color vision

Bipedalism

The ability to walk upright on two legs; a defining adaptation that separated hominids from other apes

Australopithecus

An ancient bipedal primate genus that lived in Africa millions of years ago, representing an intermediary step in human evolution

Homo erectus

An early human ancestor species that walked fully upright, possessed a larger brain capacity, and utilized tools and fire

Evolutionary medicine

A branch of medical science that analyzes how human human diseases and dysfunctions trace back to our evolutionary past

Organism

A single, complete living individual

Organ system

A group of organs that unique interact to carry out a collective, major functional purpose in the body

Organ

A structure composed of two or more tissue types that work together to carry out a specific function

Tissue

A mass of similar cells and cell products that forms a discrete region of an organ and performs a specific function

Cell

The smallest, simplest structural and functional unit of life

Organelle

A microscopic structure inside a cell that carries out an individual, specialized function

Molecule

A chemical particle composed of at least two atoms held together by chemical bonds

Atom

The smallest particles of matter with unique chemical identities

Reductionism

The philosophical approach that a complex system can be understood by studying its simpler, individual components

Holism

The complementary theory that there are "emergent properties" of a whole organism that cannot be predicted from looking at its separate parts alone

Anatomical variation

The natural differences in internal anatomy from person to person, meaning not everyone matches the textbook standard

Claude Bernard

French physiologist who observed that the internal conditions of the body remain fairly constant even when external conditions change drastically

Walter Cannon

The American physiologist who coined the exact term "homeostasis" to describe the body's dynamic baseline of internal stability

Dynamic equilibrium

A state of balance in homeostasis around a fluctuating set point, rather than a completely rigid, unmoving state

Set point

The average baseline or optimal value for a given internal body condition (e.g., body temperature)

Negative feedback loop

A homeostatic mechanism where the body senses a change and activates processes that negate, reverse, or minimize it

Vasodilation

The widening of blood vessels near the skin surface to radiate heat away from the body when it gets too warm

Vasoconstriction

The narrowing of blood vessels near the skin surface to retain core body heat when the environment gets cold

Receptor

A cell or organ specialized to detect a stimulus or structural change within the body

Integrating (control) center

A mechanism (like the brain) that processes incoming sensory information, relates it to the set point, and makes a decision on what the response should be

Effector

The cell, tissue, or organ that carries out the final corrective action commanded by the control center to restore homeostasis

Positive feedback loop

A self-amplifying cycle in which a physiological change leads to even greater change in the same direction, rather than reversing it

Gradients

A difference in chemical concentration, electrical charge, physical pressure, temperature, or other variable between two points.

Down a gradient

Movement from an area of higher concentration, pressure, or temperature to an area of lower concentration, pressure, or temperature; requires no added energy.

Up a gradient

Movement from an area of lower concentration, pressure, or temperature to an area of higher concentration, pressure, or temperature; requires energy expenditure.

Eponyms

Medical terms named after the specific person who discovered or described the structure (e.g., Fallopian tubes).

Acronyms

Words formed from the first letters of a series of words, such as MRI or DNA.

Unity of form and function

The fundamental physiological theme that anatomical structure directly dictates and enables its biological function.