Chapter 2 Flashcards
What is the definition of homeostasis?
condition or maintenance of bodily function where there is relatively constant or unchanging internal environment; at rest and unstressed
What is a good example of dynamic nature of homeostasis?
variability in blood pressure
What is steady state exercise?
an EXERCISE CONDITION where certain body functions have attained dynamic constancy at a new level
What are good examples of steady state?
changes in heart rate and oxygen consumption, ventilation, sweating, and body temperature
What helps maintain homeostasis?
biological control system
What are the components of a biological control system
receptor, integrating control center, and effector mechanism
what is negative feedback?
response caused by the effector mechanism works in opposition to the initial stimulus
Nonbiological negative feedback system?
thermostat
Biological Control Systems
Thermoregulation Regulation of Blood Pressure Regulation of Blood Glucose Cellular Stress Response Fluid Balance
Study the charts Homeostatic Control/Regulation of Blood Pressure/Regulation of Blood Glucose
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Explain intracellular signaling
a chemical messenger is produced inside a cell and triggers pathways within the same cell for a specific response
Explain Juxtacrine Signaling
cell communicates by cell to cell contact through small junctions that connect between their cytoplasms
Explain Autocrine Signaling
a cell produces and releases a chemical messenger into the extracellular fluid that acts upon the cell produces the signal
Explain Paracrine Signaling
cell signal acts locally on nearby cells
Explain Endocrine Signaling
cells release hormones into the blood and they are carried throughout the body