Loop of Henle refers to the absorption of water. The kidneys produce concentrated urine by a complex sequence of events which is known as the counter-current multiplier system. This system resides in the loop of Henle, which is a hairpin loop interposed between the proximal and distal tubules of a nephron. 

Addison's disease is characterised by low blood pressure, muscular weakness, loss of appitite and excessive loss of NaCl in the urine. It occurs due to hyposecretion of adrenal cortex. 

The main component of fats in mammals are triglycerides. 

 Edward's syndrome is an abnormality leading to mental deficiency. It is caused by trisomy of chromosome number 18.

Down's syndrome is a trisomic condition on the 21st chromosome which is the result of non disjunction, i.e. failure of synapsed homologous chromosomes to separate during anaphase-I of meiosis. 

Abducens is a purely motor nerve which  orginates form the ventral side of the medulla and supplies to the posterior rectus muscles of the eye ball.