• Gross (macroscopic)
• Microscopic
• Developmental

Levels of Structural Organization

• Chemical
• Cellular
• Tissue
• Organ
• Organ system
• Organismal

• Maintaining boundaries
• Movement
• Responsiveness
• Digestion
• Metabolism
• Dispose of wastes
• Reproduction
• Growth

a. Integumentary System- Hair, skin and nails

b. Skeletal System- Joint and Bones

c. Muscular System- Skeletal muscles

d. Nervous System- Brain, nerves, and spinal cord

e. Endocrine System- Pineal, Pituitary, Thyroid, Thymus, Adrenal, Pancreas, Ovary, Testis

f. Cardiovascular System- Heart and blood vessels

g. Lymphatic System/Immunity- Red bone marrow, Thymus, Lymphatic vessels, thoratic duct, spleen, lymph nodes

h. Respiratory System- Nasal cavity, Pharynx, larynx, trachea, bronchus, lung

i. Digestive system- Oral cavity, esophagus, liver, stomach, small & large intestine, rectum, and anus

j. Urinary System- Kidney, ureter, urinary bladder, urethra

k. Male reproductive system

L. Female reproductive system

• Too much or too little is harmful
• Nutrients
• Oxygen
• Water
• Normal Body Temp
• Atmospheric pressure

Response reduces or shuts off original stimulus

ie: Body tem, blood volume

Response enhances or exaggerates original stimulus

ie: labor contractions, platelet plug formation & blood clotting

• Body Erect
• Feet slightly apart
• Palms facing forward

Inferior

(Caudal)

Ventral 

(Anterior)

Dorsal

(Posterior)

Lines internal body cavity walls

(moss on cave wall)

Covers internal Organs

(Oil on the body to get through the cave)