Question

Name the tissue responsible for the movement in our body.

Answer 1

Hint: A tissue is an assembly of similar cells and their extracellular matrix from the same origin that together carry out a specific function.

Complete answer:

Muscular tissue

1. The muscular tissue is responsible for movement in our body.
2. The three types of muscle tissue are cardiac, smooth, and skeletal.
3. Muscular tissue consists of muscle fibres, namely Actin and Myosin which are elongated cells.
4. The movement is caused when these muscles contract and relax.
5. When a neurotransmitter reaches receptors on the membranes of muscle fibres, membrane ion channels open, and the process that contracts a relaxed muscle fibre begins.
6. Open channels allow an influx of sodium ions into the cytoplasm of the muscle fibre.
7. The sodium influx also triggers the release of stored calcium ions.
8. The calcium ions diffuse into the muscle fibre.
9. Calcium along with ATP produces the final contraction.
10. The 'sliding filament theory' explains the mechanism of muscle contraction.
11. According to this theory-
- The backbone of a muscle fibre is actin filaments which are also called 'I' band.
- The myosin filaments are also called the 'A' band.
- Myosin filaments remain in relatively constant length during muscle stretch or contraction.
- Myosin and actin filaments lie side-by-side and in the absence of ATP, they do not form cross-linkages.
- During contraction, actin filaments move into the A bands and the I bands shorten.
- The energy for the contraction is derived from the actin-myosin linkages which depend on ATP hydrolysis by the myosin.

Additional information:
There are many other types of tissues present in our body. The four major types of tissue in the body are epithelial, connective, muscle, and nervous.
All muscle tissues have four characteristics in common:
- Excitability- the ability to get stimulated by an electrical impulse.
- Contractility- they contract and relax to facilitate movement.
- Extensibility – they can be stretched.
- Elasticity – they return to normal length after stretching.

Note: Each type of muscle tissue in the human body has a unique structure and a specific role. Skeletal muscle moves bones and other structures. Cardiac muscle contracts the heart to pump blood. The smooth muscle tissue that forms organs like the stomach and bladder changes shape to facilitate bodily functions.