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Actin is present in thin filaments....

Actin is present in thin filaments.

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### Step-by-Step Solution: 1. **Understanding the Statement**: The statement given is "Actin is present in thin filaments." We need to determine if this statement is true or false. 2. **Defining Actin**: Actin is a protein that plays a crucial role in muscle contraction and is a major component of the cytoskeleton in eukaryotic cells. 3. **Identifying Muscle Filaments**: In muscle fibers, there are two types of filaments: - **Thin Filaments**: Composed primarily of actin. - **Thick Filaments**: Composed primarily of myosin. 4. **Confirming the Composition of Thin Filaments**: Since thin filaments are mainly made up of actin, we can conclude that actin is indeed present in thin filaments. 5. **Conclusion**: The statement "Actin is present in thin filaments" is true. ### Final Answer: The statement is true; actin is present in thin filaments. ---
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True and False statements : Actin is present in thin filament. (T/F)

Which protein is present in thick flament and thin filament ?

Read the following statements and select the correct option : I. In the skeletal muscles fibre, large number of myofilaments are arranged in the sarcoplasm. II. The central part of an anisotropic band where the only thick , filament is present and thin filament is absent is called 'A' band. III. In the resting state , a tropomyosin protein masks the active b binding sites for myosin on the active filaments . IV. The junction between a motor neuron and the sarcolemma of the muscle fibres is called motor-end plate.

Actin fiber is present in

Name the three proteins present on the thin myo-filament

Assertion: on stimulation, a muscle cell releases calcium ions (Ca^(2+)) from sarcoplasmic reticulum. Reason: By reacting with a protien complex, Ca^(2+) uncover active sites on the actin filaments.

Which of the following statements are correct regarding muscle proteins ? (i) Actin is a thin filament and is mde up to two F-actin (ii) The complex protein, tropomyosin is distributed at regular intervals on the troponin (iii) Myosin is a thick filament which is also a polymerised protein. (iv) The globular head of meromyosin consists of light meromyosin (LMM).

At rest, when muscle is relaxed, thin filaments interdigitate with thick filaments only

At rest, when mucsle is relaxed, thin filaments interdigitate with thick filaments only

Knowledge Check

  • Consider the following four statements (i)-(iv) and select the correct option. (i) Actin is present in thin filament. (ii) H-zone of striated muscle fibre represents both thick and thin filaments. (iii) There are 11 pairs of ribs in man. (iv) Sternum is present on ventral side of the body.

    A
    `{:("(i)","(ii)","(iii)","(iv)"),(F,F,T,F):}`
    B
    `{:("(i)","(ii)","(iii)","(iv)"),(F,F,F,T):}`
    C
    `{:("(i)","(ii)","(iii)","(iv)"),(T,F,F,T):}`
    D
    `{:("(i)","(ii)","(iii)","(iv)"),(T,F,T,F):}`

  • Assertion: on stimulation, a muscle cell releases calcium ions (Ca^(2+)) from sarcoplasmic reticulum. Reason: By reacting with a protien complex, Ca^(2+) uncover active sites on the actin filaments.

    A
    If both assertion and reason are ture and reason is the corect explanation of assertion
    B
    If both assertion and reason are ture but reson is not the correct explanation of assertion
    C
    If assertion is true reason is false
    D
    If both assertion and reason are false