The one which causes contraction of wall of the uterus during and after birth?

Related Mcqs:

1. What happens during muscle contraction to the length of each myosin and action filament?

   A. Z- lines get closer
   B. A band becomes short
   C. 1 band elongates
   D. There is no change in sarcomere

2. Which of the following step occurs immediately after binding of Ca2+ with troponin molecule during muscle contraction.

   A. Binding sites of actin get attached to the myosin head.
   B. Troponin uncovers the actin binding sites.
   C. Tropomyosin gets removed from the binding sites of actin filaments.
   D. Ca2+ goes back inside sarcoplasmic reticulum.

3. The contraction of which of the following muscle fibers, is controlled by hormones?

   A. A smooth muscle
   B. A cardiac muscle
   C. A skeletal muscle.
   D. All of these

4. A smallest contractile unit of muscle contraction called sarcomere is the area between two:

   A. H- zone
   B. M- Line
   C. Z- Line
   D. A band

5. In an annelids, the contraction of circular muscle results in___________?

   A. Lengthening of the body.
   B. Shortening of the body.
   C. Widening of body
   D. Thinning of body

6. The first layer of cell wall which is formed is___________?

   A. Primary wall
   B. Secondary wall
   C. Middle lamella
   D. All of these

7. In which of the following pigments major energy reserves and cell wall are like plants?

   A. Rhodophyta
   B. Chlorophyta
   C. Phaeophyta
   D. Chrysophyta

8. Cell wall is absent in___________?

   A. Cocci
   B. Bacilli
   C. Mycobacterium
   D. Mycoplasma

9. ___________ component of cell wall has grreat affinity with water?

   A. Lignin
   B. Cellulose
   C. Pectin
   D. All of these

10. Cell wall is richly impregnated with silica in__________?

    A. Rhodophyta
    B. Phaeophyta
    C. Baciliariophyta
    D. Euglenophyta