Death from CNS syndrome results from Increased intracranial

Death from CNS syndrome results from: Increased intracranial pressure Destruction of neurons damage to the brainstem Reduction in white blood cell count The most noticeable change in cell sensitivity to radiation due to oxygen occurs around which concentration? Atmospheric (21% O_2) 100% O_2 venous blood (20-40 mm Hg) less than 5% O_2 The risk of neonatal death in mice is greatest when irradiated at which development stage? Conception Pre-implantation Organogenesis Fetal Perfluorocarbons can improve tumour killing during radiation therapy because: tumour cells Perfluorocarbons increase oxygen supply to the and oxygen will sensitize the tumour cells to radiation Perfluorocarbons will increase blood flow Perfluorocarbons are toxic to tumour cells A radiation does of Gy to males would in which of the following? Temporary sterility Complete killing of all mature sperm Permanent sterility Increased hormone production

Solution

35 A increased intracranial pressure. that is increased pressure in the confining cranial vault as the result of increased fluid content caused by edema, vasculitis, and meningitis.

36 C radiation sensitivity is maximum at oxygen tension at 20mm hg venous blood

37 preimplantation

38 B perflurocarbons, a artificial blood substituent,are small particles capable of carrying more oxygen than heamoglobin or by manipulating the oxygen unloading capacity of blood by modifying the oxy-heamoglobin dissociation curve.it improves tissue oxygenation and sensitizes tumor against radiation.

39 A it results in azoospermia(absence of living spermatozoa) ie., temporary sterility.