People with myasthenia gravis have fewer ___ receptors, reduced by between ___

How is work stress related to monetary costs for companies?

a. absenteeism b. occupational injuries c. inefficiency d. all of the above e. none of the above

How much of one's body weight does the brain account for?

a) less than 1% b) 2% c) 10% d) 20% e) 100%