Which of the following junctions are formed by a protein called cadherin ?

Skeletal

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Smooth

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Cardiac

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Involuntary

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Solution

The correct option is C
Cardiac

Tight junctions help to stop substances from leaking across a tissue. Gap junctions facilitate the cells to communicate with each other by connecting the cytoplasm of adjoining cells, for rapid transfer of ions, small molecules and sometimes big molecules. Adherens junction help in cementing or packing the neighbouring cells together and are formed by a protein called Cadherin. Desmosomes are intercellular junctions that connect intermediate filaments to the cell surface and mediate strong cell-cell adhesion.

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Which of the following junctions are formed by a protein called cadherin ?

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. Study the following and identify the incorrect statements
(i) Muscles of iris and ciliary body are smooth muscles of mesodermal origin
(ii) Slow and sustained involuntary contraction of smooth muscles are called spasms
(iii) Quiescent mononucleate myogenic cells of skeletal muscles are called pericytes
(iv) Skeletal muscles fibre is multinucleate and is a syncytium

Fill in the blanks.

$\begin{matrix} Skeletal muscle & Smooth muscle & Cardiac muscle Movement type & i. - -------- - & Involuntary & Involuntary Structure & ii. - -------- - & Long cells with & iii. - -------- - pointed ends and uninucleate \end{matrix}$

Q. Read the following statements and find out the incorrect statement.
A. About

45 - 50 %

of the body weight of a human adult is contributed by muscles.
B. Muscles have special properties like excitability, contractility, extensibility and elasticity.
C. Based on their location, three types of muscles are identified: skeletal, smooth and cardiac.
D. Based on appearance, cardiac muscles are striated. They are involuntary in nature as the nervous system does not control their activity directly.

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