chapter 1
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Chapter 1
The Human Body
2
Introduction
• Anatomy - the study of the structure of the body
• Physiology - the study of the function of the body parts
• Basic reference systems– directions, planes, cavities, structural units
3
Terms of Direction
Orientation and Directional Terms
Table 1.1
Orientation and Directional Terms
Table 1.1 (cont)
6
Planes
7
Cavities
• Dorsal– cranial, spinal
• Ventral– thoracic, abdominopelvic
Body Cavities
Figure 1.7
Abdominopelvic Quadrants
Figure 1.8a
Abdominopelvic Regions
Figure 1.8b
Body Planes
Figure 1.6
Body Landmarks
• Anterior
Figure 1.5a
Body Landmarks
• Posterior
Figure 1.5b
Structural Units
15
Cells
• Smallest units of life
• Perform all activities necessary to maintain life– metabolism, assimilation, digestion, excretion,
reproduction
16
Tissues
• Made up of different types of cells
• Epithelial - covers and protects
• Connective - binds and supports other tissues
• Muscle - movement
• Nervous - connects sensory structures to motor structures
17
Organs
• Cells integrated into tissues
• Serve a common function
• Examples– liver– stomach
Systems
A group of organs that perform a common function
Figure 1.2a
Organ System Overview• Integumentary
– Forms the external bodycovering
– Protects deeper tissue frominjury
– Synthesizes vitamin D– Location of cutaneous
nerve receptors
Figure 1.2b
Organ System Overview• Skeletal
– Protects and supportsbody organs
– Provides muscleattachment for movement
– Site of blood cellformation
– Stores mineral
Figure 1.2c
Organ System Overview
• Muscular– Allows locomotion– Maintains posture– Produces heat
Figure 1.2d
Organ System Overview
• Nervous– Fast-acting control
system– Responds to internal and
external change– Activates muscles and
glands
Figure 1.2e
Organ System Overview
• Endocrine– Secretes regulatory
hormones• Growth• Reproduction• Metabolism
Figure 1.2f
Organ System Overview
• Cardiovascular– Transports materials in body
via blood pumped by heart• Oxygen• Carbon dioxide• Nutrients• Wastes
Organ System Overview• Lymphatic
– Returns fluids to blood vessels
– Disposes of debris– Involved in immunity
Figure 1.2g
Organ System Overview
• Respiratory– Keeps blood supplied with
oxygen– Removes carbon dioxide
Figure 1.2h
Organ System Overview
• Digestive– Breaks down food– Allows for nutrient
absorption into blood– Eliminates indigestible
material
Figure 1.2i
Organ System Overview
• Urinary– Eliminates nitrogenous
wastes– Maintains acid – base
balance– Regulates water and
electrolytes
Figure 1.2j
Organ System Overview
• Reproductive– Production
of offspring
Figure 1.2k
30
Homeostasis
• Maintenance of the body’s internal environment
• Negative feedback loop
• Examples– blood sugar levels– body temperature
Homeostasis
• Maintenance of a stable internal environment = a dynamic state of equilibrium
• Homeostasis must be maintained for normal body functioning and to sustain life
• Homeostatic imbalance – a disturbance in homeostasis resulting in disease
• http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.aspx?gcid=000070&ptid=17
Overview of Homeostasis
Figure 1.4
Maintaining Homeostasis
• The body communicates through neural and hormonal control systems– Receptor
• Responds to changes in the environment (stimuli)• Sends information to control center
Maintaining Homeostasis
– Control center• Determines set point• Analyzes information• Determines appropriate response
– Effector• Provides a means for response to the stimulus
Feedback Mechanisms
• Negative feedback– Includes most homeostatic control
mechanisms– Shuts off the original stimulus, or reduces its
intensity– Works like a household thermostat
Feedback Mechanisms
• Positive feedback– Increases the original stimulus to push the
variable farther– In the body this only occurs in blood clotting
and birth of a baby
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