Bio 226 Lab Exam 1 UPDATED ACTUAL Questions and CORRECT
Answers
What is homestasis? a relatively constant internal environment (cells, tissue, organ systems work to
maintain homeostasis)
What measurements are checked to ensure homeostasis? temperature or blood pressure
How is homeostasis maintained? feedback loops (positive and negative)
What are the three parts of a feedback loop? sensor, Integrating (control) center, effector
positive feedback loop a feedback loop in which change in a system is amplified
negative feedback loop A feedback loop that causes a system to change in the opposite direction from
which it is moving
set point the physiological value around which the normal range fluctuates
normal range the restricted set of values that is optimally healthful and stable (body temp. 96-
100)
flow diagram useful way of organizing the information about the negative feedback system
Blood Pressue (BP) pressure blood exerts against systemic arterial walls
Heart Rate (HR) contractions per minute
Stroke Volume (SV) the volume of blood ejected from ventricles per contraction
BP= _______ x ________ x ____________ HR x SV x TPR
TPR total peripheral resistance- resistance to blood flow ( vasoconstriction = ↑/
vasodilation= ↓)
Answers
What is homestasis? a relatively constant internal environment (cells, tissue, organ systems work to
maintain homeostasis)
What measurements are checked to ensure homeostasis? temperature or blood pressure
How is homeostasis maintained? feedback loops (positive and negative)
What are the three parts of a feedback loop? sensor, Integrating (control) center, effector
positive feedback loop a feedback loop in which change in a system is amplified
negative feedback loop A feedback loop that causes a system to change in the opposite direction from
which it is moving
set point the physiological value around which the normal range fluctuates
normal range the restricted set of values that is optimally healthful and stable (body temp. 96-
100)
flow diagram useful way of organizing the information about the negative feedback system
Blood Pressue (BP) pressure blood exerts against systemic arterial walls
Heart Rate (HR) contractions per minute
Stroke Volume (SV) the volume of blood ejected from ventricles per contraction
BP= _______ x ________ x ____________ HR x SV x TPR
TPR total peripheral resistance- resistance to blood flow ( vasoconstriction = ↑/
vasodilation= ↓)
