Post on 13-Jan-2016
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Chapter 1Introduction to Human
Anatomy and Physiology
Chapter 1Introduction to Human
Anatomy and Physiology
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Levels of Organization
• Subatomic Particles• Electrons, protons, neutrons
• Atom• Hydrogen atom, lithium atom
• Molecule• Water molecule, glucose molecule
• Macromolecule• Protein molecule, DNA molecule
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• Organelle
• Mitochondrion, Golgi apparatus, nucleus
Levels of Organization
• Cell• Muscle cell, nerve cell
• Tissue• Simple squamous epithelium, loose connective tissue
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• Organ • skin, femur, heart,
kidney
Levels of Organization
• Organ System• skeletal system, digestive system
• Organism•human
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Levels of Organization
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• Cell membrane• Controls what
moves in & out of cell
• Selectively permeable
Cells
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• Cell membrane• Phospholipid bilayer
• Water-soluble “heads” form surfaces
– Hydrophilic• Water-insoluble “tails” form interior
– Hydrophobic• Permeable to lipid-
soluble substances
Cells
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• Cell membrane
Cells
• Cholesterol stabilizes the membrane• Proteins
• receptors• pores, channels, carriers• enzymes• CAMS• self-markers
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• Endoplasmic Reticulum
Cytoplasmic Organelles
• Connected, membrane-bound sacs, canals, & vesicles• Transport system
• Rough ER• Studded with ribosomes• Protein synthesis
• Smooth ER• Lipid synthesis
•Added to proteins arriving from rough ER
• Break down of drugs
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• Ribosomes
Cytoplasmic Organelles
• Free floating or connected to ER
• Provide structural support
• Function in protein synthesis
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• Golgi apparatus
Cytoplasmic Organelles
• Stack of flattened, membranous sacs
• Modifies, packages & delivers proteins
• Vesicles
• Membranous sacs that store substances
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• Mitochondria
Cytoplasmic Organelles
• Generate ATP energy through cellular respiration
• Membranous sacs with inner partitions
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Lysosomes• enzyme-containing
sacs• digest worn out cell
parts or unwanted substances
Centrosome• two rod-like
centrioles• used to produce cilia
and flagella• distributes
chromosomes during cell division
Cytoplasmic Organelles
Peroxisomes• enzyme-containing sacs• break down organic molecules
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Cilia• short hair-like
projections• propel substances on
cell surface
Cytoplasmic Organelles
Flagellum• long tail-like projection• provides motility to sperm
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• Control center of cell
Cell Nucleus
• Nuclear envelope• Porous double membrane• Separates nucleoplasm from cytoplasm
• Nucleolus• Dense collection of RNA and proteins• Site of ribosome production
• Chromatin• Fibers of DNA and proteins• Stores information for synthesis of proteins
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• Passive (Physical) Processes• Require no cellular
energy• Simple diffusion• Facilitated diffusion• Osmosis• Filtration
• Active (Physiological) Processes• Require cellular
energy• Active transport• Endocytosis• Exocytosis• Transcytosis
Movements Into and Out of the Cell
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• Series of changes a cell undergoes from the time it forms until the time it divides
The Cell Cycle
• Stages • Interphase• Mitosis• Cytoplasmic division
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• Cell grows• Cell maintains routine functions
Interphase
• Cell replicates genetic material to prepare for nuclear division• Cell synthesizes new organelles to prepare for cytoplasmic division
• Phases• G phases – cell grows and synthesizes structures other than DNA• S phase – cell replicates DNA
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• Produces two daughter cells from an original somatic cell
• Nucleus divides – karyokinesis• Cytoplasm divides – cytokinesis
Mitosis
• Stages• Prophase – chromosomes form; nuclear envelope disappears• Metaphase – chromosomes align midway between centrioles• Anaphase – chromosomes separate and move to centrioles• Telophase – chromatin forms; nuclear envelope forms
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• Also known as cytokinesis
• Begins during anaphase
• Continues through telophase
• Contractile ring pinches cytoplasm in half
Cytoplasmic Division
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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
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Clinical ApplicationMedical 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
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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
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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
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Requirements of Organisms
Life depends on five environmental factors• Water• Food• Oxygen• Heat• Pressure
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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
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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
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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
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Homeostatic Mechanisms
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Body Cavities
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• Dorsal Cavity• Includes the skull and vertebral column
Body Cavities
• Ventral• Everything else• Subdivided into two parts
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• Ventral Cavity• Thoracic cavity
Body Cavities
• Pleural cavity• contains lungs
• Mediastinum • contains everything in thorax but the lungs
• Pericardial cavity• contains heart
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• Ventral Cavity• Abdominopelvic
cavity
Body Cavities
• Abdominal cavity• Stomach• Spleen• Liver,• Gall bladder• Pancreas• Small intestine • Most of large intestine
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• Ventral Cavity• Abdominopelvic cavity
Body Cavities
• Pelvic cavity• Internal reproductive organs• Urinary bladder• Appendix• Some large intestine
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Thoracic & Abdominal Membranes
Thoracic Membranes•Visceral pleura•Parietal pleura•Visceral pericardium•Parietal pericardium
Visceral layer – covers an organParietal layer – lines a cavity or body wall
Abdominopelvic Membranes•Parietal peritoneum•Visceral peritoneum
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Serous Membranes
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Serous Membranes
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Anatomical Terminology
Anatomical Position – standing erect, facing forward, upper limbs at the sides, palms facing forward
Terms of Relative Position• Superior versus Inferior
• Anterior versus Posterior
• Medial versus Lateral
• Ipsilateral versus Contralateral• Proximal versus Distal• Superficial versus Peripheral
• Deep
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Body Sections
• Sagittal / Midsagittal or Median / Parasagittal
• Transverse or Horizontal
• Coronal or Frontal
• Cross section, Oblique, Longitudinal
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Body Sections
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Body Sections
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Body Sections
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Abdominal Subdivisions
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Body Regions