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biology
| Term | Definition |
|---|---|
| Schwann cell | type of neural cell found in peripheral nervous system that form Myelin sheath |
| Threshold | minimum change thet is required to generate |
| Columnar | rectangular cell type Ex:digestive tract & oviduct |
| Pseudostratified | a layered epithelial tissue that has no true layers because are side touches the basement membrane |
| Stratified epithelia | epithelia has layers of cells piled on top of each other |
| Ceratinocytes | building blocks of fibrous protein:keratin found in epidermis tha gives structure and waterproofing(hair,nails,skin) |
| Multipolar neurons | neurons that have only one axon -efferent -interneurons |
| Action Potential | change in polanity in oxon when transmition occures -gated ion ch.(open according stimulus) -ungated ion ch.(are always open) |
| Neurotransmiter | a chemical that enables neurotransmission and binds to ligand gated ionch.to open them:dopamine(pleasure,acetylcohline,seratonine,norepinephrine(learning) (mood) |
| Cuboidal | cube like cells Ex:kidney &glands |
| Synapse | region where terminal of 1st neuron &dendrite or cell body of the 2nd come close but don't touch |
| Node of Ranvier | unmyelinated part of an axon where transmission of impulses occures faster |
| Astrocytes | type of neuroglia that produces a hormone"glia-derived"growth factor~cure for Parkin son disease. Supports neurons,provide nutrient and synapses |
| Oligendrocytes | type of neuroglial cell that forms Mylin sheath |
| Microglia | a type of neuroglia that engulfs bacterial &cellular debris |
| Protein fibers | a common component of connective tissue where are included: 1)collagen(flexibility & strength 2)reticular(thin & support) 3)elastic(elasticity) |
| Arrector Pilimuscle | muscle found in dermis that is responsible for goosebumps |
| Melanocytes | a spider shaped cell that synthesis melanin~pigment for skin color.It increases in contact with UV light |
| Sebaceous gland | a gland found in dermis that secretes sebum wich then covers hair and epidermis to make them waterproof and protect from cracking |
| Hypodermis | the 3rd layer of skin that is an anchor for skin to attach to muscle/bone.Adipose tissue that isulates and is shock proof |
| D-Vitamin synthesis | 2+ process of absorbition of Ca fromm digestive tract &blood when a similar to chalesteral molecule contracts our skin |
Created by:
Ketrin
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