16
Locomotion requires a perfect coordinated activity of muscular ............... systems.
Explanation
Locomotion requires a prefect coordinated activity of muscular, skeletal and neural systems.
17
Sarcolemma, sarcoplasm and sarcoplasmic reticulum refer to particular type of cell in our body. Which is this cell and to what parts of that cell do these names refer to?
Explanation
There parts belongs to the muscle fibre, which is lined by the plasma membrane called sarcolemma. Muscle fibre is a syncitium because sarcoplasm (the cytoplasm) of muscle fibre contains number of nuclei and sarcoplasmic reticulum is the endoplasmic reticulum of the muscle fibre and is the store house of calcium ions.
18
Label the different components of actin filament in the diagram given below
Explanation
Representing different component of actin filament
19
The three tiny bones present in middle ear are called ear ossicles. Write them in correct sequence beginning from ear drum.
Explanation
Each middle ear contains three tiny bones, named, i.e., malleus, incus and stapes which are collectively called as ear ossicles.
20
What is the difference between the matrix of bones and cartilage?
Explanation
Difference between the matrix of bones and cartilage
| Matrix of Bones | Matrix of Cartilage |
|---|---|
| Matrix of bones has an inflexible material, the ossein. | Matrix of cartilage has a flexible material, the chondrin. |
| Matrix of bones contains calcium salts. | Calcium salts may or may not be present in matrix. |
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