1 Chapter 1 Introduction to Human Anatomy and Physiology.

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Presentation transcript:

1 Chapter 1 Introduction to Human Anatomy and Physiology

2 Levels of Organization Subatomic Particles – electrons, protons, neutrons Atom – hydrogen atom, lithium atom Molecule – water molecule, glucose molecule Macromolecule – protein molecule, DNA molecule Organelle – mitochondrion, Golgi apparatus, nucleus Cell – muscle cell, nerve cell Tissue – simple squamous epithelium, loose connective tissue Organ – skin, femur, heart, kidney Organ System – skeletal system, digestive system Organism - human

3 Levels of Organization

4 Anatomy and Physiology Anatomy – study of structure (Greek – “a cutting up”) Physiology – study of function (Greek – “relationship to nature”) Structure is always related to function

5 Clinical Application Medical Imaging Noninvasive procedures Provide images of soft internal structures Magnetic Resonance Imaging Requires injection of dye Produces computerized images from different angles Ultrasonography Use of high- frequency sound waves Relatively quick and inexpensive

6 Characteristics of Life Movement – change in position; motion Responsiveness – reaction to a change Growth – increase in body size; no change in shape Respiration – obtaining oxygen; removing carbon dioxide; releasing energy from foods Reproduction – production of new organisms and new cells

7 Characteristics of Life Absorption – passage of substances through membranes and into body fluids Circulation – movement of substances in body fluids Assimilation – changing of absorbed substances into chemically different forms Excretion – removal of wastes produced by metabolic reactions Digestion – breakdown of food substances into simpler forms

8 Requirements of Organisms Life depends on five environmental factors water food oxygen heat pressure

9 Requirements of Organisms Water - most abundant substance in body - required for metabolic processes - required for transport of substances - regulates body temperature Food - provides necessary nutrients - supplies energy - supplies raw materials

10 Requirements of Organisms Oxygen (Gas) - one-fifth of air - used to release energy from nutrients Heat - form of energy - partly controls rate of metabolic reactions Pressure - application of force on an object - atmospheric pressure – important for breathing - hydrostatic pressure – keeps blood flowing

11 Homeostasis Body’s maintenance of a stable internal environment Homeostatic Mechanisms – monitor aspects of the internal environment and corrects any changes Receptors - provide information about stimuli Control center - tells what a particular value should be (includes a set point) Effectors - elicit responses that change conditions in the internal environment

12 Homeostatic Mechanisms

13 Homeostatic Mechanisms

14 Body Cavities

15 Thoracic & Abdominal Membranes Thoracic Membranes Visceral pleura Parietal pleura Visceral pericardium Parietal pericardium Visceral layer – covers an organ Parietal layer – lines a cavity or body wall Abdominopelvic Membranes Parietal peritoneum Visceral peritoneum

16 Serous Membranes

17 Serous Membranes

18 Organ Systems

19 Organ Systems

20 Organ Systems

21 Organ Systems

22 Organ Systems

23 Organ Systems

24

25 Anatomical Terminology Anatomical Position – standing erect, facing forward, upper limbs at the sides, palms facing forward Terms of Relative Position Superior - above Inferior - below Anterior - front Posterior - back Medial – imaginary midline - divides into 2 halves Lateral – toward the side

26 Proximal – closer to the trunk Distal – further from the trunk Superficial – close to the surface Peripheral – toward the outer edge Deep – parts more internal

27 Body Sections Planes along which the body may be cut to observe the relative locations and arrangements of internal parts. Sagittal – lengthwise down the middle, right and left Transverse – horozontal plane, upper and lower Coronal – divides into front and back halves

28 Body Sections

29 Body Sections

30 Body Sections

31 Abdominal Subdivisions

32 Body Regions

33 Vital Signs Pulse and breathing movements Blood pressure Temperature Reflexes