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Mechanism of enzyme action

By: HWC, Views: 7613

â–  The substrate makes contact with the active site. â–  A change in the shape of the enzyme occurs resulting in the transformation of the substrate. â–  A substrate may undergo decomposition, have its atoms rearranged, or two substrates may be synthesized. â–  The products of the reaction...

Polysaccharides

By: HWC, Views: 7325

More complex sugars are called polysaccharides (from "poly" meaning "many" and "saccharum" meaning "sugar"). Many things in nature are made of polysaccharides. Here we show one of the polysaccharides in corn, another in wood, and another in the exoskeletons of insects like grasshoppers. How are a...

Mechanisms of capillary exchange (transcytosis & bulk flow)

By: HWC, Views: 7407

â–  This method of capillary exchange is mainly used to transport small amounts of large, lipid-insoluble (water soluble) molecules, such as large proteins. â–  Substances, packaged in vesicles, move through endothelial cells via endocytosis and exocytosis. â–  This method of exchange is th...

Carbon fixing adaptations Animation

By: HWC, Views: 1815

Different plants trap carbon by different pathways. Most C3 plants evolved in moist, temperate zones. On hot dry days they close their stomata to conserve water and oxygen accumulates. Under these circumstances, the enzyme rubisco uses oxygen in an inefficient reaction that competes with t...

Mechanics of Sound Animation

By: Administrator, Views: 10994

Process of Hearing Sound waves are directed to the eardrum, causing it to vibrate. These vibrations move the three small bones of the middle ear (malleus, incus, and stapes). Movement of stapes at oval window sets up pressure waves in the perilymph and endolymph. Process of Hearing The wav...

Uterine (menstrual) cycle - phases

By: HWC, Views: 7728

• The uterus goes through a cyclical developmental pattern to be ready for implantation and support of an embryo. • The uterine, or menstrual, cycle is under the control of ovarian horrnones. • The uterine cycle also has three phases: • Menstrual phase • Proliferative phase â€...

Lipid absorption - end products & transport mechanism

By: HWC, Views: 7274

• The end products, fatty acids and monoglycerides, depend on bile salts for absorption. • Bile salts form micelles (tiny spheres), which ferry fatty acids and monoglycerides to epithelial cells. • Free fatty acids, monoglycerides, and some phospholipids and cholesterol molecules, dif...

Bone cells and tissues - tissue composition and cells

By: HWC, Views: 8579

Bone tissue consists of bone cells secreting bone matrix. • The extracellular bone matrix is a connective tissue that is hard, yet flexible. • Collagen fibers provide flexibility. • Inorganic mineral salts (primarily calcium phosphate, or hydroxyapatite) provide hardness. • Togethe...

Isovolumetric VC, Ventricular ejection, Isovolumetric & Passive ventricular filling

By: HWC, Views: 7701

• Isovolumetric means that blood volume does not change. • Ventricular blood volume and cell length remain constant. • With valves closed and contraction continuing, ventricular pressure continues to rise. • Ventricular pressure rises above arterial pressure. • Increased ventr...