Chapter 20: Locomotion and Movement

Q1Written answer

Name the cells/tissues in human body which

(a) Exhibit amoeboid movement

(b) Exhibit ciliary movement

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Ans: (a) Macrophages

Ans: (b) Ciliated epithelium

Q2Written answer

Locomotion requires a perfect coordinated activity of muscular, _____ systems

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Ans: Skeletal and neural

Q3Written answer

Sarcolemma, sarcoplasm and sarcoplasmic reticulum refer to a particular type of cell in our body. Which is this cell and to what parts of that cell do these names refer to?

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Ans: This is a cell of the muscle. Sarcolemma is the lining that surrounds muscle fibers. Sarcoplasm is the protoplasm found in muscle fibers. Sarcoplasmic reticulum is a type of endoplasmic reticulum found in muscle fibers.

Q4Written answer

Label the different components of actin filament in the diagram given below.

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Ans:

Q5Written answer

The three tiny bones present in the middle ear are called ear ossicles. Write them in the correct sequence beginning from the ear drum.

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Ans: Malleus, Incus and Stapes

Q6Written answer

What is the difference between the matrix of bones and cartilage?

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Ans: Bones are highly rigid due to the presence of calcium salts in the bone matrix and form the skeleton of the vertebrates. Cartilage are thin and flexible connective tissues whose matrix is pliable due to chondroitin salts.

Q7Written answer

Which tissue is affected by Myasthenia gravis? What is the underlying cause?

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Ans: Skeletal muscle is affected by Myasthenia gravis. It happens because of an immune disorder.

Q8Written answer

How do our bone joints function without grinding noise and pain?

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Ans:In a moveable joint, the heads of the bones have cartilaginous coverings. Furthermore, the joint is encased in a capsule that contains lubricating fluid. This allows joints to move without making a grinding noise or causing pain.

Q9Written answer

Give the location of a ball and socket joint in a human body

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Ans: Between the humerus and the pectoral girdle, there is a ball and socket joint. Between the femur and the pelvic girdle, it is also present.

Q10Written answer

Our fore arm is made of three different bones. Comment.

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Ans: Our fore arm is made of three different bones, viz. humerus, radius and ulna

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