| ⇦ | 
| ⇨ |
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
Related Questions: - Which part of the leaf is meant for photosynthesis and gaseous exchange?
- The fixation and reduction of CO occur in presence of
- Smooth endoplasmic reticulum acts as a major site for synthesis of
- Number of plant species estimated to be present in India is
- Similipal is
Topics: Locomotion and Movement
(106)
Subject: Biology
(4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Which part of the leaf is meant for photosynthesis and gaseous exchange?
- The fixation and reduction of CO occur in presence of
- Smooth endoplasmic reticulum acts as a major site for synthesis of
- Number of plant species estimated to be present in India is
- Similipal is
Topics: Locomotion and Movement (106)
Subject: Biology (4253)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply