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Biology Flashcards > Locomotion and movement > Flashcards

Locomotion and movement Flashcards

1
Q

Q 1. )Which of the following statements are correct regarding skeletal muscle? (2023)

A. Muscle bundles or (fascicle) are held together by collagenous connective tissue layer called fascicle. (fascia)

B. Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions.

C. Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins.

D. M line is considered as functional unit of contraction called sarcomere. (Z line)

A

B and C only

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2
Q
  1. During muscular contraction which of the following events occur? (2021)

(a) ’H’ zone disappears
(b) ’A’ band widens ( A band remains the same)
(c) ’I’ band reduces in width
(d) Myosin hydrolyzes ATP, releasing the ADP and Pi
(e) Z-lines attached to actins are pulled inwards

A

(a), (c), (d), (e) only

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3
Q
  1. Calcium is important in skeletal muscle contraction because it (2018)

A. Binds to troponin to remove the masking of active sites on actin for myosin
B Activates the myosin ATPase by binding to it
C. Detaches the myosin head from the actin filament
D. Prevents the formation of bonds between the myosin cross bridges and the actin filament.

A

A. Binds to troponin to remove the masking of active sites on actin for myosin

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4
Q
  1. Name the ion responsible for unmasking of active sites for myosin for cross-bridge activity during muscle contraction (NEET - II 2016)

A. Calcium
B. Magnesium
C. Sodium
D. Potassium

A

A. Calcium

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5
Q
  1. Sliding filament theory can be best explained as (2015 Canceled)

A. Actin and myosin filaments do not shorten but rather slide pass each other
B. When myofilaments slide pass each other, myosin filaments shorten while actin filaments do not shorten
C. When myofilaments slide pass each other actin filaments shorten when myosin filaments do not shorten.
D. Actin and myosin filaments shorten and slide pass each other

A

A. Actin and myosin filaments do not shorten but rather slide pass each other

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5
Q
  1. Stimulation of a muscle fibre by a motor neuron occurs at (2014)

A. The neuro-muscular junction
B. The transverse tubules
C. The myofibril
D. The sarcoplasmic reticulum

A

A The neuro-muscular junction

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6
Q
  1. The H zone in the skeletal muscle fibre is due to (2013)

A. The central gap between actin filaments extending through myosin filaments in the A - band.
B. Extension of myosin filaments in the central portion of the A-band
C. The absence of myofibrils in the central portion of A-band
D. The central gap between myosin filaments in the A band

A

A. The central gap between actin filaments extending through myosin filaments in the A - band.

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7
Q
  1. During muscle contraction in humans, (Karnataka NEET 2013)

A. Sarcomere does not shorten
B. A band remains same
C. A, H, and I bands shorten
D. Actin filaments shorten

A

B. A band remains same

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8
Q
  1. What is sarcomere? (2001)

A. Part between two H-line
B. Part between two A-line
C. Part between two I-band
D. Part between two Z-line

A

D. Part between two Z-line

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9
Q
  1. Which of the following is the contractile protein of a muscle? (1998)

A. Tropomyosin
B. Tubulin
C. Myosin
D. All of these

A

C. Myosin

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10
Q
  1. The functional unit of contractile system in striated muscle is (1998)

A. Sarcomere
B. Z-band
C. Cross bridge
D. Myofibril

A

A. Sarcomere

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11
Q
  1. Match the following columns and select the correct option. (2020)

Floating Ribs (i) Located between second and seventh ribs
Acromion (ii) Head of the Humerus
Scapula (iii) Clavicle
Glenoid cavity (iv) Do not connect with the sternum

A

Floating Ribs - Do not connect with the sternum
Acromion - Clavicle
Scapula - Located between second and seventh ribs
Glenoid cavity - Head of the Humerus

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12
Q
  1. Select the correct option. (2019)

(1) 8th, 9th and 10th pairs of ribs articulate directly with the sternum.

(2) 11th and 12th pairs of ribs are connected to the sternum with the help of hyaline cartilage. (Floating)

(3) Each rib is a flat thin bone and all the ribs are connected dorsally to the thoracic vertebrae and ventrally to the sternum. (corrected dorsally to the vertebral column)

(4) There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.

A

(4) There are seven pairs of vertebrosternal, three pairs of vertebrochondral and two pairs of vertebral ribs.

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13
Q

Pelvic gridle consists of

A

Two coxal bones (Hip bone)

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14
Q

Coxal is formed by fusion of three bones

A

Illium. Ischium and pubis

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15
Q

At the point of fusion of the (illium, Ischium and public) is a cavity called……… to which the thigh bone (femur) articulates.

A

Acetabulum

16
Q

The thigh bone (femur) articulates with

A

Acetabulum

17
Q

Two haves of the pelvic gridle (coxal bone) meet ventrally to form the …. containing fibrous cartilage

A

Pubic symphysis

18
Q

Pubic symphysis which joint

A

Fibrous

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