There is a
transient electro-physiologic dysfunction of the reticular activating system in
the upper midbrain caused by rotation of the cerebral hemispheres on the fixed
brainstem. -The CSF cushions the brain from light trauma in times of more
severe impact, the forces on the brain may be linear, angular, or rotational, in
rotational movement, the head turns around its center of gravity: this is the
primary mechanism causing concussion. 
 
        
             
        
        
        
Answer:
The necessary structure for asexual reproduction
Explanation:
 
        
             
        
        
        
Answer
RIBOSOMES on the ROUGH ENDOPLASMIC RETICULUM
Explanation:
This is the site of protein synthesis usually find attached to the rough endoplasmic reticulum or  freely on the cystosol,
 When they are attached to the  endoplasmic reticulum they appeared as back dots which makes the surface of ER to appear rough, hence the name ROUGH ER. Smooth ER, lacks Ribosomes, and therefore appears smooth,
Ribosomes  are made up of PROTEIN AND RNA.
They are 25nm in diameter;when viewed under high magnification, where theymade up of  two sub-units  the small and large units.
The protein synthesize by the Ribosomes are passed into the sacs  of Rough E.R  for transportation,
 
Basically, a complete Ribosomes is refereed to as 70S for prokaryotic ribosomes and 80S for Eukaryotic Ribisomes.This refers to their sedimentation Co-efficient in Svedberg units,the Eukaryotes sediment faster than the Prokaroytes