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| organs tissues organ systems ectoderm mesoderm endoderm stem cells epithelial tissues apical (free) surface basement membrane squamous cuboidal columnar simple stratified pseudostratified microvilli connective tissues extra-cellular matrix ground substance fibroblast collagen elastin proteoglycans loose connective tissue dense connective tissue adipose tissue blood cartilage bone plasma erythrocytes leukocytes platelets chondrocyte lacunae hydroxyapatite osteocytes lacunae canaliculi osteoblasts osteoclasts osteoprogenitor cells neurons neuroglia cell body axon dendrites electrochemical impulse Schwann cells voluntary involuntary actin myosin muscle contraction skeletal muscle striated cardiac muscle smooth muscle choanocyte choanoflagellates organ system nervous system endocrine system skeletal system ligaments cartilage marrow muscular system respiratory system cardiovascular system digestive system integumentary system urinary system nephrons immune system reproductive system homeostasis negative feedback positive feedback epidermis melanocytes keratinocytes sebaceous gland cells dermis myoepithelium arrector pili muscles laminin epidermolysis bullosa integuments hair follicle keratin feather keratinized sweat glands invaginations sebaceous glands sebum |