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

Related Mcqs:

1. 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...

2. 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...

3. 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...

4. 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....

5. __________ are believed to have common origin with annelids.

   A. Nematods B. Arthropods C. Molluscs D. None of these...

6. Which of following system is segmentally arranged in annelids?

   A. Excretory system B. Digestive system C. Criculatory system D. Nervous system...

7. The organs of locomotion in annelids are__________?

   A. Muscles B. Hydrostatic skeleton C. Parapodia D. Setae...

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

   A. ADH B. MSH C. Oxytocin D. Progesterone...

9. Which of the following statements is incorrect about skeletal muscle fibers?

   A. They are multinucleated. B. They are 10 – 100 ?m in diameter & surrounded by sarcolemma C. They contain O2 storing molecules called hemoglobin. D. Their cytoplasm contains high concentration of carbohydrates...

10. Which of the following muscle is an antagonistic member of Biceps brachii?

    A. Bracheoradialis B. Brachialis. C. Intercostals D. Triceps...