2. what are the levels of organization of the ch. 1 warm-up · what are the levels of organization...
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Ch. 1 Warm-Up
1. How is anatomy different from physiology?
2. What are the levels of organization of the human body from smallest → largest?
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Ch. 1 Warm-Up
1. What is the anatomical position? Describe or draw it.
2. How are the following cuts or planes made?a) Frontalb) Transversec) Sagittal
3. What type of cut would separate the brain into anterior and posterior parts?
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The Human Body: An OrientationChapter 1
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Objectives:
• Explain how structure complements function• Name the levels of structural organization• List the functions necessary for life• List the survival needs of the body• Define homeostasis and explain its significance• Use correct anatomical terms to describe the
body
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• Anatomy: studies the structure of body parts and their relationship to one another
• Physiology: the function of the body parts
• Complementarity of Structure & Function▫ What a structure can do depends on its specific
form▫ “Structure dictates function”
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Levels of Structural Organization• atom→molecule→organelle → cells → tissue →
organ → organ system → organism
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Overview of Organ Systems
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Overview of Organ Systems
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Overview of Organ Systems
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Overview of Organ Systems
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Overview of Organ Systems
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Overview of Organ Systems
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Anatomical Position• Body erect, feet slightly apart, palm face
forward, thumbs pointing out
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Terms you need to know:• Superior (cranial)• Inferior (caudal)• Ventral (anterior)• Dorsal (posterior)• Medial• Lateral• Intermediate• Proximal• Distal• Superficial (external)• Deep (internal)
• Axial• Appendicular• Saggital plane
▫ Midsaggital/median
• Frontal (coronal) plane
• Transverse (horizontal) plane
• Oblique section
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Directional Terms
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Directional Terms
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Directional Terms
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Regional Terms
• Axial: main part of body = head, neck, & trunk
• Appendicular: limbs attached to axis
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The body can be cut (sectioned) along flat surfaces called planes
• Sagittal plane: divides into right/left▫ Median or midsagittal (exactly down middle)▫ Parasaggital
• Frontal/coronal plane: divides into anterior/posterior
• Transverse/horizontal plane: divides into superior/inferior
• Oblique: diagonal cuts between horizontal & vertical
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Which plane is shown below?
kidneys brain thigh
heart
headchest
(lungs + heart)
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Body Cavities
• Dorsal body cavity:▫ Cranial cavity▫ Vertebral/spinal cavity
• Ventral body cavity▫ Thoracic⚫ lungs, heart, trachea,
esophagus▫ Abdominopelvic⚫digestive, reproductive,
urinary
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MembranesSerosa: lines ventral
body cavity & outer surfaces of organs▫ Parietal serosa – lines
cavity wall▫ Visceral serosa – folds
in; covers organs in cavity
• Serous fluid: lubricates space between membranes
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Abdominopelvic Quadrants
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Abdominopelvic Regions
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Survival Needs
• Nutrients• Oxygen• Water• Normal Body Temperature (98.6°F or 37°C)• Atmospheric Pressure
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Necessary Life Functions for Humans
1. Maintaining boundaries (inside vs. outside)2. Movement (internal & external)3. Responsiveness: sense changes and respond4. Digestion: break down foods for absorption5. Metabolism: all chemical reactions in body6. Excretion: remove wastes7. Reproduction: cell division, whole organism8. Growth: increase in size/part
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Homeostasis
• Maintain relatively stable internal conditions• Receptor (input) → control center → effector
(response)• Negative (-) feedback: reduces effect of stimulus
▫ Eg. body temp, breathing rate, blood sugar levels• Positive (+) feedback: increases response
▫ Eg. labor contractions, blood clotting• Diseases = homeostatic imbalance
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