plasma membrane and tissue types

peripheral proteins

only on one side of the membrane - associated with membrane by noncovalent linkages

glycocalyx

layer of glycoproteins which surround cell membrane

3 major lipids types in membranes

phospholipids, cholesterol, glycolipids

at low temps, cholesterol fluidity

increases - increases distance between PLs and disrupts regular packing

at high temps cholesterol ____ fluidity

decreases - decreases distance between PLs and reduces movement

transmembrane proteins

amphipathic, integral

cell junctions

separate apical and basal membranes in tight junctions between cells

structural proteins

integrins allow cell to attach to extracellular matrix

membrane carbohydrates

mostly on outside

oligo/polysaccharides, up to 10% of membrane mass

connective tissue function

mechanical strength, protection, storage

dense connective tissue

mainly collagen and proteoglycans - cartilage, bone and tendon

loose connective tissue

holds small glands and epithelia together, includes basal lamina of cells

epithelial tissue function

lines organs and cavities, protects against mechanical injury, barrier against microbes and fluid loss

different types of epithelial tissue

cuboidal, simple columnar, pseudostratified columnar, simple squamous, stratified squamous

muscle tissue function

support and movement. skeletal - voluntary, smooth - involuntary, cardiac

muscle tissue structure

long excitable cells, fibres divided into myofibrils, thin actin and thick myosin filaments, creates sarcomeres

nervous tissue function

senses stimuli and transmits signals throughout animal

nervous structure

neurones - transmit impulses

glial cells nourish, insulate and replenish neurones - dendrites conduct towards, axons away from nerve impulses