• sum of all chemical and physical changes sustaining an organism • ability to acquire and use energy in support of these changes
26
New cards
Responsiveness
• ability to sense and respond to environmental changes • includes both internal and external environments
27
New cards
Growth
• can increase in size • size of cells, groups of cells, extracellular materials
28
New cards
Development
• changes in form and size • changes in cell structure and function from generalized to specialized—differentiation
29
New cards
Reproduction
• formation of new cells or new organisms • generation of new individuals • tissue repair
30
New cards
Homeostasis
• maintenance of constant internal environment despite fluctuations in the external or internal environment • dynamic state of equilibrium • homeo = sameness; stasis = standing still
31
New cards
Variables
• measures of body properties that may change in value
32
New cards
Normal range
normal extent of increase or decrease around a set point
33
New cards
Set point
normal, or average value of a variable Over time, body temperature fluctuates around a set point
34
New cards
FEEDBACK SYSTEMS
cycle of events in which a condition in the body is continually monitored, evaluated, changed, remonitored, and reevaluated
35
New cards
Receptor
• detects changes in variable
36
New cards
Control center
• receives receptor signal • establishes set point • sends signal to effector
37
New cards
Effector
• directly causes change in variable
38
New cards
Negative feedback system
reverses a change in a controlled condition
39
New cards
Positive Feedback System
strengthens or reinforce a change in one of the body’s controlled condition
40
New cards
Negative feedback
is the main mechanism used homeostatic regulation.
41
New cards
Positive feedback
mechanisms occur when the initial stimulus further stimulates the response
42
New cards
Superior
Nearer to the head
43
New cards
Inferior
Away from the head
44
New cards
Anterior
Nearer to the front of the body
45
New cards
Posterior
Nearer to the back of the body
46
New cards
Medial
Nearer from the midline, or midsagittal plane
47
New cards
Lateral
Farther from the midline, or midsagittal plane
48
New cards
Intermediate
Between two structures
49
New cards
Ipsilateral
On the same side of the body from the structure
50
New cards
Contralateral
On the opposite side of the body from the structure
51
New cards
Proximal
Nearer from the attachment of a limb to the trunk
52
New cards
Distal
Farther from the attachment of a limb to the trunk