Chapter 17 Solutions — Locomotion and Movement

Exercises

1. 1.
   Draw the diagram of a sarcomere of skeletal muscle showing different regions.
2. 2.
   Define sliding filament theory of muscle contraction.
3. 3.
   Describe the important steps in muscle contraction.
4. 4.
   Write true or false. If false change the statement so that it is true.

   • (a) Actin is present in thin filament
   • (b) H-zone of striated muscle fibre represents both thick and thin filaments.
   • (c) Human skeleton has 206 bones.
   • (d) There are 11 pairs of ribs in man.
   • (e) Sternum is present on the ventral side of the body.
5. 5.
   Write the difference between:

   • (a) Actin and Myosin
   • (b) Red and White muscles
   • (c) Pectoral and Pelvic girdle
6. 6.
   Match Column I with Column II: Column I:

   • (a) Smooth muscle
   • (b) Tropomyosin
   • (c) Red muscle
   • (d) Skull Column II:
   • (i) Myoglobin
   • (ii) Thin filament
   • (iii) Sutures
   • (iv) Involuntary
7. 7.
   What are the different types of movements exhibited by the cells of human body?
8. 8.
   How do you distinguish between a skeletal muscle and a cardiac muscle?
9. 9.
   Name the type of joint between the following:

   • (a) atlas/axis
   • (b) carpal/metacarpal of thumb
   • (c) between phalanges
   • (d) femur/acetabulum
   • (e) between cranial bones
   • (f) between pubic bones in the pelvic girdle
10. 10.
    Fill in the blank spaces:

    • (a) All mammals (except a few) have __________ cervical vertebra.
    • (b) The number of phalanges in each limb of human is __________
    • (c) Thin filament of myofibril contains 2 'F' actins and two other proteins namely __________ and __________.
    • (d) In a muscle fibre Ca++ is stored in __________
    • (e) __________ and __________ pairs of ribs are called floating ribs.
    • (f) The…