Write the valence-bond wavefunction for the single bond in HF.
Traumatic Brain Injury A.Types of Head Injuries I. Penetrating a. The skull is pierced or broken b. Brain beneath is damaged c. Consequences may be less severe than in closed TBI if injury is restricted II. Crushing a. Head is caught between two objects b. Rarest form c. Often the most serious damage is to the base of the skull and nerves that run through III. Closed a. Most common b. Head suddenly accelerates, decelerates, or rotates c. No penetrating wounds d. Damage is caused by the movement of the soft brain mass e. Diffuse damage to axons is widespread but often most severe at the level of the brain stem and reticular formation f. Arteries and veins may also be torn B. Coup and Contrecoup injuries Focal Injuries occur as the brain hits the skull on impact a. The damage at the site of impact is called “coup” b. Damage to the opposite side because of brain acceleration is “contrecoup” C. Damage I. that occurs in the first few seconds of an accident = first injury II. Second injury = breathing problems, loss of blood, lowered blood pressures, so decreased supply of blood and oxygen to the brain III. Third Injury = swelling of the brain as the escaping fluids from damaged cells and blood from torn vessels cause a rise in intracranial pressure = brain swelling. Can result in ischemia. Keep blood pressure at correct level, adequate air and oxygen,