Read the following statements
(i) In cardiac muscle fibres sacroplasmic reticulum is poorly formed
(ii)B Blood supply is scanty in case of smooth muscle fibres
(iii) Tropomyosin occurs in actin filaments in the form of complexes which are arranged over actin fibres and represent sites where myosin binds to actin.
(iv) Salts of citrate and oxalates act as anticoagulants as they precipitate `Ca^(2+)`
Select the correct statements

Options

A. (i),(ii),(iii)
B. (i),(iii),(iv)
C. (ii),(iii),(iv)
D. (i),(ii),(iv)

Answer

To determine which of the statements are correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i)**: "In cardiac muscle fibres, sarcoplasmic reticulum is poorly formed."
- **Analysis**: This statement is **correct**. In cardiac muscle fibers, the sarcoplasmic reticulum is indeed less developed compared to skeletal muscle fibers. This is important for the unique contraction mechanism of cardiac muscles.

2. **Statement (ii)**: "Blood supply is scanty in case of smooth muscle fibres."
- **Analysis**: This statement is also **correct**. Smooth muscle fibers have a lower blood supply compared to skeletal muscles. This is due to their function and the regulatory mechanisms they employ.

3. **Statement (iii)**: "Tropomyosin occurs in actin filaments in the form of complexes which are arranged over actin fibres and represent sites where myosin binds to actin."
- **Analysis**: This statement is **incorrect**. Tropomyosin actually blocks the binding sites on actin for myosin. It does not represent the sites where myosin binds; rather, it prevents myosin from binding to actin unless calcium ions are present.

4. **Statement (iv)**: "Salts of citrate and oxalates act as anticoagulants as they precipitate Ca²⁺."
- **Analysis**: This statement is **correct**. Citrate and oxalate salts can bind calcium ions, thus preventing blood coagulation, which makes them effective anticoagulants.

### Conclusion:
The correct statements are (i), (ii), and (iv). Therefore, the answer is that statements 1, 2, and 4 are correct.

### Final Answer:
The correct statements are: **(i), (ii), and (iv)**.

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