© 2009 delmar, cengage learning chapter 7 anatomy and physiology
TRANSCRIPT
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Chapter 7
Anatomy and Physiology
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7:1 Basic Structure of the Human Body
• The normal function of the human body is compared to an organized machine
• The machine malfunctions, disease occurs
• Anatomy: study of form and structure• Physiology: study of processes• Pathophysiology: study of how disease
occurs and body’s response
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Tissues
• Cells of same type joined together• 60%–99% water• Groups of tissues
– Epithelial– Connective– Nerve– Muscle
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Organs and Systems
• Organs: two or more tissues joined together for a specific purpose
• Systems: organs and other body parts joined together for a particular function
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7:2 Body Planes/Directions/Cavities
• Body planes: imaginary lines drawn through body at various levels to separate body into sections
• Directional terms are created by planes• Transverse plane• Midsagittal or median plane• Frontal or coronal plane• Proximal and distal
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Cavities
• Spaces within the body that contain vital organs
• Dorsal or posterior cavity• Ventral or anterior cavities
– Thoracic cavity– Abdominal cavity– Pelvic cavity
• Three small cavities
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Abdominal Regions
• Abdominal cavity is separated into regions or sections because it is so large
• Quadrants– RUQ– LUQ– RLQ– LLQ
(continues)
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Abdominal Regions (continued)
• Regions– Epigastric– Umbilical– Hypogastric– Hypochondriac– Lumbar – Iliac or inguinal
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7:3 Integumentary System
• Name for the skin and its structures• Called a membrane because it covers
the body• Called an organ because it contains
several kinds of tissues• Called a system because it has organs
and other parts that work together for a particular function
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Layers of the Skin
• Epidermis—outermost layer, cells are constantly shed and replaced
• Dermis—“true skin”, contains connective tissue, blood vessels, nerves, glands, determines fingerprints
• Subcutaneous fascia or hypodermis—the innermost layer, made of connective tissue and connects skin to muscle
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Glands and Other Parts of the Skin
• Sudoriferous glands (sweat glands)-sweat contains water, salts and some body waste– Sweat is odorless until it reacts with bacteria on skin
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• Sebaceous glands (oil glands)-– open onto hair follicles, prevent skin and hair from
becoming dry,– sebum is acidic so it prevents bacterial infections– When it becomes blocked pimples and blackheads
occur
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• Hair-– hair shaft is a hollow tube formed in a follicle– Gives protection– Alopecia (balding) may occur
• Nails-– Protect nails and toes – Formed in the nail bed
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Functions
• Protection-UV rays, pathogens, holds moisture
• Sensory perception-pain, temp, pressure• Regulation of body temperature-dilation
and constriction, perspiration• Storage-fats, vitamins, water, sugar,salts
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• Absorption-transdermal medications • Excretion-body salt, water and heat • Production-vitamin D from UV rays
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Skin Color—Pigmentation
• Skin color is inherited and is determined by pigments in the epidermis
• Melanin-brownish, black • Carotene-yellowish, red
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Skin Color—Albino
• Absence of skin pigments
• Skin has pinkish tint• Hair is pale yellow or
white• Eyes are red in color
and sensitive to light
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Skin Color—Abnormal
• Erythema-reddish color
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• Jaundice-yellow discoloration
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• Cyanosis-blueish color due to lack of oxygen, can lead to brown or gray discoloration
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Skin Eruptions
• Macules (macular rash)-flat spots on the skin
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• Papules (papular rash)-firm, raised area, pimples
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• Vesicles-fluid filled sacs, blister
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• Crust-dried pus or blood (scab)
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• Wheal-itchy, elevated area with irregular shape, hives or insect bites
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• Ulcer-deep loss of skin surface
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Diseases and Abnormal Conditions
• Acne vulgaris• Athlete’s
foot-http://www.medicinenet.com/image-collection/athletes_foot_2_picture/picture.htm
• Skin cancer• http://www.cancer.org/cancer/
skincancer/galleries/skin-cancer-images#18– Basal cell carcinoma– Squamous cell carcinoma– Melanoma
(continues)
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Diseases and Abnormal Conditions (continued)
• Dermatitis- inflammation of the skin caused by Cause-any substance that irritates the skin
• ex: poison ivy• Symptoms-erythema,
itching, dry skin, macular-papular rashes
• TX-eliminate cause, anti-inflammatory ointments, antihistamines and or steroids
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• Eczema-noncontagious, inflammation
• Cause-allergens ,• Soaps, diet, meds,
stress• Symptoms-dryness,,
itching, vesicles, erythema
• TX-remove irritant, cortiosteroids
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• Impetigo-highly contagious
• Caused -by bacteria• Symptoms-erythema,
oozing vesicles, pustules and formation of yellow crust
• Tx-wash lesions and keep them dry, antibiotics
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• Psoriasis-chronic, noncontagious, periods of exacerbations and remissions
• Cause-unknown but may be genetic, stress, cold weather, sunlight, hormonal changes tend to cause exacerbations
• Symptoms-thick red areas covered with white or silver scales
• Tx-coal/tar or cortisone ointments, UV light, scale removal
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• Ringworm-highly contagious
• Cause-fungus• Symptom-flat or
raised circular area with clear center, itchy, scaly or crusty ring
• Tx-antifungal meds
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• Verrucae-wart• Cause-virus• Symptom-rough hard,
elevated, rounded lesion
• Tx-if needed liquid nitrogen, acid, chemicals or electricity