Muscle

Q. Correct order of action of hydrophilic hormones is
I. Hormones bind to plasma membrane
II. Physiological response
III. Biochemical response
IV. Generation of secondary messenger

Choose the correct option-

1. I, IV, III, II
2. III, I, II, IV
3. I, II, III, IV
4. II, I, III, IV

Q. The functional unit of contractile system of a striated muscle is

1. sarcosome
2. sarcomere
3. Z – band
4. myofibril

Q. Muscles originate from

1. ectoderm
2. none of the above
3. endoderm
4. mesoderm

Q.

Choose the correct order of muscle contraction from starting to completion.

1. Stimuli → Neurotransmitter Release of Ca2+ ⟹ Cross bridge formation → Excitation of T-system Sliding of actin filament

2. Stimuli ⟹ Neurotransmitter Excitation of T-system ⟹ Release of Ca2+ → Cross bridge formation Sliding of
   actin filament → ‘H’ band diminishes

3. Stimuli Excitation of T-system Neurotransmitter secretion Cross bridge formation ⟹ Sliding of actin filament ⟹ H-band diminishes

4. Stimuli → Neurotransmitter Cross bridge formation ⟹ Excitation of T-system ⟹ Sliding of actin filament

Q. Assess the statements.
1. A-bands of the muscle is dark and contain myosin.
2. I-bands are the light bands and contain actin.
3. During muscle contraction the A-band contracts.
4. The part between the two Z-lines is called as sarcomere.
5. The central part of thick filament, not overlapped by thin filament, called H-zone.
Of the above statements.

1. 1, 3, 5 are correct while 2, 4 are incorrect.
2. 1, 2 and 3 are correct while 4 and 5 are incorrect.
3. 1 and 2 are correct while 3, 4 and 5 are incorrect.
4. 1, 2, 3 and 5 are correct while 4 is incorrect.
5. 1, 2, 4 and 5 are correct while 3 is incorrect.

Q.

The striations in striated muscle correspond with actual molecular structures. Which of the following is the Z line?

1. a band where only actin molecules are found

2. a band where only myosin molecules are found

3. an attachment point for actin moleculesa

4. an attachment point for myosin molecules

Q. On stimulation of skeletal muscle, calcium is immediately made available for binding to troponin from

1. Lymph
2. Blood
3. Bone
4. Sarcoplasmic reticulum

Q. A muscle can only pull and not push.

1. False
2. True

Q. A coelom is

1. A body cavity lined by ectoderm.
2. A body cavity lined by endoderm.
3. A body cavity lined by mesoderm.
4. Not lined by any layer.

Q.

What percent of the total body weight of an adult humans is made up of muscle?

1. 40 - 50 %

2. 30 - 40 %

3. 60 - 70 %

4. 45 - 55 %

Q. Muscles originate from

1. endoderm
2. mesoderm
3. ectoderm
4. none of the above

Q.

A muscle can _____

1. Pull only

2. Push only

3. Pull and Push

4. None of these

Q. Which of the following is important for muscle contraction and nerve impulse transmission?

1. ${Ca}^{2+}$ ions
2. ${Fe}^{2+}$ ions
3. ${Ca}^{2+}$ and ${Mg}^{2+}$ ions
4. ${Mg}^{2+}$ ions

Q. The functional unit of contractile system in striated muscle is

1. Cross bridge
2. Sarcomere
3. Myofibril
4. Z-band

Q. Anisotropic band protein is

1. Actin
2. Troponin
3. Myosin
4. Both A and C

Q. Longest skeletal muscle

Q. Which of the following is the regulatory protein of a muscle?

1. Myosin
2. All of the above
3. Tropomyosin
4. Tubulin

Q. The immediate regeneration of ATP used up during muscle contraction is facilitated by

1. Glucose.
2. Glycogen.
3. Lactic acid.
4. Creatine phosphate.

Q.

A muscle can _____

1. Pull only

2. Push only

3. Pull and Push

4. None of these

Q. In a skeletal muscle, T-tubules

1. Secrete acetylcholine
2. Give mechanical support
3. Conduct impulse forward
4. Release calcium flow for muscle contraction

Q. Which of the following is not correct for gastrulation

1. Archenteron is formed
2. All germinal layers are formed
3. Morphogenetic movements
4. Some blastomeres & blastocoel degenerate

Q. The group which originate from mesoderm is

1. Thyroid, Pancreas, Kidney
2. Heart, Spleen, Gonad
3. Pineal body, Stomodeum, Proctodaeum
4. Nervous system, Epidermis, Internal ear

Q. Which of the following is an autoimmune disorder?

1. Myasthenia gravis
2. Osteoporosis
3. Muscular dystrophy
4. Gout

Q. The simple single muscular contraction caused by a single short stimulus is called as

1. Tendon
2. Twitch
3. Refractory period
4. Tetanus

Q. The muscular contraction in which the tension remains same and the mechanical work is also done, is called as

1. Isometric contraction
2. Tetanus
3. Single muscle twitch
4. Isotonic contraction

Q. During contraction of muscles,

1. Myosin filament slide over actin
2. Actin filament slide over actin
3. Actin filament slide over myosin
4. None of the above

Q. Which one of the following is the correct matching of three items and their grouping category?

1. Actin, myosin, rhodopsin : Muscle proteins
2. Cytosine, uracil, thiamine : Pyrimidines
3. Malleus, incus, cochlea : Ear ossicles
4. None of these

Q. The type of muscles present in our

1. Intestine are striated and involuntary.
2. Heart has involuntary and unstriated smooth muscles.
3. Thigh are striated and voluntary.
4. Upper arm are smooth muscle fibres fusiform in shape.

Q.

The functional unit of contractive system in striated muscle is______.

1. Myofibril

2. Sarcomere

3. Z-band

4. Cross bridges

Q. In metazoa, which one of the following is responsible for locomotion and movement of organs?

1. Nervous tissues
2. Epithelial tissues
3. Connective tissues
4. Muscular tissues