1. Muscle shortening and active movement: Answer Isotonic 2. Muscle shortening withoutshortening the extremity (no movement): Answer Isometric 3. Impaired muscle strength or weakness: Answer Paresis 4. Absence of strength secondary to nervous impairment: Answer Paralysis 5. When should an infant be able to sit and have head control?: Answer 3-6 months 6. When should an infant be able to sitsteadily,roll over, and pull to standing?- Answer : 6-9 months 7. When should an infant be progressing toward walking?: Answer 9-12 months 8. When should a child be able to climb stairs,walk backward, and hop on onefoot?: Answer 4 years