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.
Related Mcqs:
- 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 - The most important function of troponin is___________?
A. To bind with actin
B. To bind with tropomyosin.
C. To bind with Ca2+ ions.
D. All of these - 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 - 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 - 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 - In Urea cycle __________ ammonia molecules combine with 1 CO2 molecule to form 1 molecule of urea.
A. 1
B. 2
C. 3
D. 4 - Which of the follwing is a childhood disease resulting from nutritive Ca2+ deficiency?
A. Hypocalcaemia Tatanic spasms.
B. Osteomalacis.
C. Rickets.
D. Tetany - The one which causes contraction of wall of the uterus during and after birth?
A. ADH
B. MSH
C. Oxytocin
D. Progesterone - Muscle fatigue occurs due to accumulation of___________?
A. Acidic acid
B. Butyric acid
C. Citric acid
D. Lactic acidSubmitted by: Babar Ali Kunbhar
- An unbroken series of species arranged in ancestors to descendent sequence with each later species having evolved from one that immediately preceded it is called?
A. Biome
B. Phyletic lineage
C. Community
D. Population
