Which of these characters are related to the diagram. (i) Smooth muscle (ii) Present only in heart (iii) Striated (iv) Voluntary (v) Fusiform (vi) Intercalated disc.

only i, iv

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only ii, iii, vi

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only ii, iii, v, vi

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only i, iii, iv, v

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Solution

The correct option is C only ii, iii, v, vi
The sketch represents cardiac muscle tissue, which is a contractile tissue present only in the heart. It has striations. Cell junctions fuse the plasma membranes of cardiac muscle cells and make them stick together. Intercalated discs at some fusion points allow the cells to contract as a unit, i.e., when one cell receives a signal to contract, its neighbours are also stimulated to contract.

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Question 8
Which of the following types of muscle are involuntary?
(i) Striated muscle
(ii) Smooth muscle
(iii) Cardiac muscle
(iv) Skeletal muscle

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iv)

Q. Assertion :Cardiac muscle of the heart is striated and has intercalated disc between its fibres (cells) Reason: It provides quick, powerful and rhythmic contractions to the heart.

Q. Identify how many statements are wrong?
(a) visceral muscles are striated.
(b) Intercalated discs are a feature of all striated muscles.
(c) smooth muscle fibres are muttinucleated
(d) sarcosomes store calcium ions needed for muscle contraction

Which of these voluntary muscles are striated?

Read the following statements and select the correct option.

Statement 1: Cardiac muscle of the heart is striated and has intercalated discs between its fibres (cells)

Statement 2: It provides quick, powerful and rhythmic contractions to the heart.

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