Home
Class 11
BIOLOGY
Calcium ion concentration in blood affec...

Calcium ion concentration in blood affects muscle contraction. Does it lead to tetany in certain cases? How will you correlate fluctuation in blood calcium with tetany?

Text Solution

Verified by Experts

(i) Role of calcium ions in muscle contraction : In the muscle fibre, calcium ions are stored in cisternae of sarcoplasmic reticulum. In response to neural signal at neuromuscular junction followed by development of action potential and formation of dystropment protein, calcium ions are released in the sarcoplasm. High `Ca^(++)` level leads to binding of `Ca^(++)` with Troponin-C and moving of tropomyosin protein. This exposes ATP binding sitesof actin. Calcium also activates enzyme myosin ATPase to hydrolyse ATPto release energy which stimulates the heads of myosin to bind with actin to form actomyosin complexes.
(ii) Relatioship between calcium and tetany : Low level of calcium in extracellular fluid and its high level in the sarcoplasm stimulates rapid and successive contraction so that there is a state of sustained contraction called tetany.
Promotional Banner

Topper's Solved these Questions

  • LOCOMOTION AND MOVEMENT

    MODERN PUBLICATION|Exercise HIGHER ORDER THINKING SKILLS & BRAIN TWISTING (VERY SHORT ANSWER QUESTIONS)|10 Videos

  • LOCOMOTION AND MOVEMENT

    MODERN PUBLICATION|Exercise HIGHER ORDER THINKING SKILLS & BRAIN TWISTING (SHORT ANSWER QUESTIONS)|9 Videos

  • LOCOMOTION AND MOVEMENT

    MODERN PUBLICATION|Exercise NCERT SOLVED - EXEMPLAR PROBLEMS (C. SHORT ANSWER TYPE QUESTIONS)|10 Videos

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    MODERN PUBLICATION|Exercise Chapter Practice Test|12 Videos

  • MINERAL NUTRITION

    MODERN PUBLICATION|Exercise CHAPTER PRACTICE TEST|16 Videos

Similar Questions

Explore conceptually related problems

Calcium ions bring about muscle contraction through

What is the role of calcium ions in muscle contraction ?

rapid spasm in muscles due to low calcium in body fluid leading to tetany is caused probably by

The steps involved in the mechanism of muscle contraction are given below. Arrange the steps in proper sequential order and select the correct option. I. Release of calcium ions in the sarcoplasm. II. Signal sent by the CNS via a motor neuron. III. Binding of calcium with a subunit of troponin on actin filaments. IV. Generation of the action potential in the sarcolemma. V. Binding of myosin head to the exposed active sites on actin to form a cross-bridge. VI. Inward pulling of ‘Z’ line attached to actin causing shortening of the sarcomere. VII. Pulling of the attached actin filaments towards the centre of 'A' band. VIII. Release of neurotransmitter acetylcholine and generation of the action potential in the sarcolemma.

Assertion: Tetany is rapid spasm in muscle. Reason: Tetany is usually caused by an increases in the blood calcium level.

Comprehension # 2 Calcium lacate is used in the food and beverage industries. It. Has also been used medicinally for treatment of various allergies, for treatment of muscular leg cramps, and as an antidote for variety of poisons, including lead, arsenicals and carbon tetrachloride. A 0.8274 g sample of anhydrous calcium lactate is found by analysis to contain 0.2732 g of C. 0.0382 g H, 0.1520 g Ca and 0.3640 g O . Each mole of calicum lactate is found to contain one mole of calcium ions. Calcium lactate can be crystallised from water as pentahydrate salt. How many grams of calcium lactate pentahydrate would be recovered from 1 g of anhydrous salt :

Which of the following statements given below are true with reference to muscle contraction. I. Neurotransmitter acetycholine is released as nerve impulse reaches the end of axon and binds to receptor sites of motor end plate. II. Action potential passes from motor end plate over sarcoplasmic and then into the T-tubules and sarcoplasmic reticulum. III. Calcium ion are released into the sarcoplasm bind to troponin, causing a change in its shape and position. IV. Myosin cross bridges are able to bind to exposed active sites of actin. Choose the correct option.

What is the role of calcium ions , troponin and F-actin during contraction of straited muscles of humans?

Blood calcium level is a resultant of how much dietary calcium is absorbed, how much calcium is lost in the urine, how much bone dissolves releasing calcium into the blood and how much calcium from blood enters tissues . A number of factors play an important role in these process . Mark the one which has no role