Biology

Locomotion and Movement

Question:

Fill in the blank spaces:
(a) All mammals (except a few) have……. cervical vertebra.
(b) The number of phalanges in each limb of human is…….
(c) Thin filament of myofibril contains two ‘F’ actins and two other proteins namely…….and…….
(d) In a muscle fibre Ca++  is stored in …….
(e)…….and…….pairs of ribs are called floating ribs.
(f) The human cranium is made of……. bones.

Answer:

 (a) 7
(b) 14
(c) tropomyosin, troponin
(d) sarcoplasmic reticulum
(e) 11th and 12th
(f) 8

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Locomotion and Movement

Q 1.

Name the type of joint between the following:
(a) atlas/axis
(b) carpal/metacarpal of thumb
(c) between phalanges
(d) femur/acetabulum
(e) between cranial bones
(f) between pubic bones in the pelvic girdle

Q 2.

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

Q 3.

Define sliding filament theory of muscle contraction.

Q 4.

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

Q 5.

Write true or false. If false change the statement so that it is true.
(a) Actin is present in thin filament.
(b) H-zone of striated muscle fibre represents both thick and thin filaments.
(c) Human skeleton has 206 bones.
(d) There are 11 pairs of ribs in man.
(e) Sternum is present on the ventral side of the body.

Q 6.

What are the points for articulation of pelvic and pectoral girdles?

Q 7.

Name the cells/tissues in human body which
(a) exhibit ameboid movement
(b) exhibit ciliary movement

Q 8.

What is the source of energy for muscle contraction?

Q 9.

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

Q 10.

Locomotion requires a perfect coordinated activity of muscular_________systems.

Q 11.

Radha was running on a treadmill at a great speed for 15 minutes continuously. She stopped the treadmill and abruptly came out. For the next few minutes, she was breathing heavily/fast. Answer the following questions.
(a) What happened to her muscles when she exercised strenuously?
(b) How did her breathing rate change?

Q 12.

Label the different components of actin filament in the diagram given below.
ncert-exemplar-class-11-biology-solutions-locomotion-movement-2

Q 13.

Match Column I with Column II:
Column I                            Column II
(a) Smooth muscle          (i) Myoglobin
(b) Tropomyosin             (ii) Thin filament
(c) Red muscle                (iii) Sutures
(d) Skull                            (iv) Involuntary

Q 14.

Describe the important steps in muscle contraction.

Q 15.

Fill in the blank spaces:
(a) All mammals (except a few) have……. cervical vertebra.
(b) The number of phalanges in each limb of human is…….
(c) Thin filament of myofibril contains two ‘F’ actins and two other proteins namely…….and…….
(d) In a muscle fibre Ca++  is stored in …….
(e)…….and…….pairs of ribs are called floating ribs.
(f) The human cranium is made of……. bones.

Q 16.

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

Q 17.

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

Q 18.

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?

Q 19.

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

Q 20.

What are the different types of movements exhibited by the cells of human body?

Q 21.

Rahul exercises regularly by visiting a gymnasium. Of late he is gaining weight. What could be the reason? Choose the correct answer and elaborat.

(a) Rahul has gained weight due to accumula-tion of fats in body.
(b) Rahul has gained weight due to increased muscle and less of fat.
(c) Rahul has gained weight because his muscle shape has improved.
(d) Rahul has gained weight because he is accumulating water in the body.

Q 22.

Name atleast two hormones which result in fluctuation of Ca++ level.

Q 23.

In old age, people often suffer from stiff and inflamed joints. What is this condition called? What are the possible reasons for these symptoms?

Q 24.

Write a few lines about gout.

Q 25.

Exchange of calcium between bone and extra-cellular fluid takes place under the influence of certain hormones.
(a) What will happen if more of Ca++ is in extracellular fluid?
(b) What will happen if very less amount of Ca++ is in the extracellular fluid?

Q 26.

Explain sliding filament theory of muscle contraction with neat sketches.

Q 27.

How does a muscle shorten during its contraction and return to its original form during relaxation?

Q 28.

Calcium ion concentration in blood affects muscle contraction. Does it lead to tetany in 3. certain cases? How will you correlate fluctuation  in blood calcium with tetany?

Q 29.

An elderly woman slipped in the bathroom and had severe pain in her lower back. After X-ray examination doctors told her, it is due to a slipped disc. What does that mean? How does it affect our health?

Q 30.

Draw the diagram of a sarcomere of skeletal muscle showing different regions.

Q 31.

Discuss the role of Ca2+ ions in muscle contraction. Draw neat sketches to illustrate your answer.

Q 32.

With respect to rib cage, explain the following:
(a) Bicephalic ribs
(b) True ribs
(c) Floating ribs

Q 33.

How do you distinguish between a skeletal muscle and a cardiac muscle?

Q 34.

Differentiate between pectoral and pelvic girdle.

Q 35.

Write the differences between:
(a) Actin and Myosin
(b) Red and White muscles
(c) Pectoral and Pelvic girdle