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Which one of the following sets of ions is necessary in the chemical events for muscle contraction?
Options
(a) Na⁺ and K⁺
(b) Na⁺ and Ca⁺⁺ ions
(c) Na⁺ and Mg⁺⁺ ions
(d) Ca⁺⁺, K⁺ and Mg⁺⁺ ions
Correct Answer:
Ca⁺⁺, K⁺ and Mg⁺⁺ ions
Explanation:
Biochemical and electrical events occurring during muscle contraction were studied by Albert Szent-Gyorogyi (1942). Muscle fibre is generally stimulated by the release of acetylcholine from the neuromotor junction. This depolarises the sarcolemma and develops an action potential with the reversal of flow of ions, more Na⁺ towards interior than K⁺ pass out. Sarcoplasmic reticulum release Ca²⁺ ions. Calcium ions remove troponin-tropomyosin block overactive site of actin filaments.ATP is required along with Mg
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Topics: Locomotion and Movement
(106)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Six elements which constitues 98% of the mass of every living organism are
- Which one of the following can be used as a bioweapon?
- Which one of the following correctly represents the normal adult human dental formula?
- Which of the following gene is responsible for biological nitrogen fixation
- Coralloid roots, which host a symbiotic relationship between an algae
Topics: Locomotion and Movement (106)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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