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Results for: 'small%20intestine'
Transferring genes into plants Animation
By: HWC, Views: 4042
Researchers extract DNA from an organism that has a trait they want to introduce into a plant. The genetic donor can be a bacterial cell, a plant cell. or even an animal cell. The desired gene will be transferred into a plasmid, a small circle of bacterial DNA. The gene is cut out of th...
Digestive chemicals - water, gastric acid, bile & bicarbonate
By: HWC, Views: 6359
• Water is the most abundant molecule in ingested fluids. • Water plays a primary role in hydrolytic digestive reactions. • Helps liquefy and transport digestive foodstuffs down the tract. • Transports secretions from accessory digestive organs to gastrointestinal tract. • Aids ...
Endocytosis - pinocytosis, receptor mediated and Transcytosis
By: HWC, Views: 6578
Pinocytosis is the process in which a cell "drinks" a tiny droplet Of extracellular fluid, including its solutes. Pinocytosis (Cell Drinking) is the process by which the cell takes in fluids (as well as any small molecules dissolved in those fluids). • The plasma membrane folds inward to...
ETC Protein Complexes & Chemiosmosis (Total ATP Production and ATP Synthase)
By: HWC, Views: 6351
You will notice that FADH2 donates two electrons further downstream than NADH. This results in only two protons being pumped across the inner membrane. The final electron acceptor for these transported electrons is oxygen. Oxygen receives these electrons, plus protons from the aqueous matrix. ...
Amniocentesis and CVS Animation
By: HWC, Views: 3585
Amniocentesis and chorionic villus sampling (CVS) are prenatal diagnostic tools. In amniocentesis, which can be performed as early as 14 weeks into the gestation period. A syringe needle is inserted through the abdominal and uterine walls to withdraw some amniotic fluid. The fluid contains...
Carbohydrate digestion (brush border enzymes, end products) & Carb absorption (fructose, galactose)
By: HWC, Views: 6687
• Carbohydrate digestion concludes in microvilli of the small intestine, in brush border epithelial cells. Carbohydrate digestion -brush border enzymes • Four brush-border enzymes are involved: • Alpha-dextrinase breaks down alpha-dextrin chains by removing glucose units. • Sucras...
Parathyroid hormone (bone resorption) & Calcitonin (bone deposition)
By: HWC, Views: 6664
• Cellular needs for calcium may cause blood calcium concentrations to decline below the normal range. • This decrease stimulates cells in the parathyroid gland to secrete parathyroid hormone. • Binding of parathyroid hormone to osteoclasts in bone tissue promotes bone resorption and th...
Type of Cell Junctions - Desmosome, Hemidesmosomes and Gap Junctions
By: HWC, Views: 7002
Cell Junctions: Cell junctions are found in some multi-cellular organisms. They exist of complexes and are found between cells and between cells and other structures. The junctions provide a way for cells to connect and exchange signals. What are tight junctions, desmosomes, and gap junctions...
How Hemoglobin Picks Up and Delivers Oxygen
By: HWC, Views: 5922
All of the cells in our bodies require oxygen (02) for survival and must release carbon dioxide (CO2) as a waste product. The respiratory and circulatory systems work together as delivery systems for these gases. The lungs exchange these gases between the environment and the bloodstream. The bloo...
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