Anatomy and Physiology 1 Chapter 1 Study Guide

Examples of positive feedback

childbirth and dangerous fevers ( oxytocin release and uterine contractions)

sonography

uses high frequency sound waves that echo back from internal organs to lean about soft tissues like glands and blood vessels. use for pregnant women.

Cells

The most basic building units of life. All living things are composed of cells.

Magnetic resonance imaging ( MRI)

Uses a magnetic file and radio waves to align hydrogen atoms, measuring energy given off to investigate soft tissues like tumors.

Negative feedback

A mechanism that keeps a variable close to the set by sensing a change and activating mechanisms to reverse it.

EXAMPLE: a thermostat regulating temperature, sweating to cool skin.

Positive feedback

• leads to greater change in the same direction.  Feedback change is repeated and the change produces more change

Prefix home

similar or same

childbirth positive feedback mechanism

fetus pushes on the cervix —) oxytocin secreted—) uterus contracts—)pushes fetus further onto the cervix.

Homeostasis

the boys ability to detect change , activate mechanism that oppose it, and maintain relatively stable internal conditions.G

Gross anatomy

The study of structures that can be seen with the naked eye.

Positron emission tomography (PET SCAN)

Assesses the metabolic state of tissue and distinguishes active tissues to evaluate for disease or conditions.

Computer tomography (CT SCAN)

Low intensity x-rays assisted with computer analysis, used to diagnose tumors, internal bleeding, or internal injuries.

Radiopaque substances

substances injected or swallowed to fill hollow structures like blood vessels o the intestinal tract during imaging.

Andreas Vesalius

The historical figure who published the first atlas of anatomy.

radiography (x-rays)

Penetrates tissues to darken photographic film; denser tissues appear whiter, making it ideal for studying bones and joints.