A. H- zone
B. M- Line
C. Z- Line
D. A band
Related Mcqs:
- If a cross section of a sarcomere is seen, each myosin is surrounded by how many actin molecules:
A. 9
B. 5
C. 6
D. 7 - 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 - 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 - 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 - 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. - Actin and myosin are the basic proteins involved in contractile machinery of our body to which type of proteins do they belong____________?
A. Globular proteins
B. Fibrous Proteins
C. Both a and b
D. None of these - The one which causes contraction of wall of the uterus during and after birth?
A. ADH
B. MSH
C. Oxytocin
D. Progesterone - 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 - Which of the following muscle is an antagonistic member of Biceps brachii?
A. Bracheoradialis
B. Brachialis.
C. Intercostals
D. Triceps - Muscle fatigue occurs due to accumulation of___________?
A. Acidic acid
B. Butyric acid
C. Citric acid
D. Lactic acidSubmitted by: Babar Ali Kunbhar
