Rtebral colum Consider the following four statements (i) -...

rtebral colum Consider the following four statements (i) - (iv) ands the correct option. (i) Actin is present in thin filament. (ii) $\mathrm{H}$-zone of striated muscle fibre represents and thin filaments. (iii) There are 11 pairs of ribs in man. (iv) Sternum is present on ventral side of the bog, (i) (ii) (iii) (iv) (a) $\mathrm{F} \quad \mathrm{F} \quad \mathrm{T}$. $\mathrm{F}$ (b) $\mathrm{F} \quad \mathrm{F} \quad \mathrm{F}$ T (c) T $\quad F \quad F$ $\begin{array}{lll}\text { d) } T & F & T & F\end{array}$

rtebral colum Consider the following four statements (i) - (iv) ands the correct option.
(i) Actin is present in thin filament.
(ii) $\mathrm{H}$-zone of striated muscle fibre represents and thin filaments.
(iii) There are 11 pairs of ribs in man.
(iv) Sternum is present on ventral side of the bog,
(i)
(ii) (iii) (iv) (a) $\mathrm{F} \quad \mathrm{F} \quad \mathrm{T}$. $\mathrm{F}$
(b) $\mathrm{F} \quad \mathrm{F} \quad \mathrm{F}$ T
(c) T $\quad F \quad F$
$\begin{array}{lll}\text { d) } T & F & T & F\end{array}$

Key Concepts

Muscle Filament System

The muscle filament system refers to the structural arrangement of proteins within muscle fibers, primarily composed of thick and thin filaments that interact to produce contraction. This system is fundamental in understanding how muscles generate force and movement at the molecular level.

Actin Protein

Actin is a globular protein that polymerizes to form filamentous structures known as thin filaments in muscle fibers. It plays a crucial role in muscle contraction by interacting with myosin, enabling the sliding filament mechanism that underlies force generation.

H-zone

The H-zone is the central region of a sarcomere in striated muscle fibers that contains only thick filaments, with minimal or no overlap from thin filaments. It is a key indicator in the study of muscle contraction dynamics, as its width changes during contraction and relaxation.

Thoracic Skeleton

The thoracic skeleton is part of the axial skeleton and consists of the ribs, sternum, and thoracic vertebrae. This framework protects vital organs such as the heart and lungs and provides attachment points for muscles involved in respiration and upper body movement.

Ribs

Ribs are curved, flat bones that form paired structures contributing to the rib cage, which encases and protects the heart and lungs. In human anatomy, the typical count is 12 pairs of ribs, each articulating with the corresponding thoracic vertebrae.

Sternum

The sternum, commonly known as the breastbone, is a flat bone located along the ventral midline of the thorax. It serves as a central anchoring point for the ribs and clavicles, playing a critical role in the structural integrity and protection of the thoracic cavity.

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