Tag: locomotion and movements

Quizzes (15) Questions (132)

Questions Related to locomotion and movements

Multiple choice muscle contraction locomotion and movements biology

During skeletal muscle contractions following events can occur:
I. I-band shortens
II. A-band shortens
III. H-zone shortens
IV. Sarcomere contract
V. ATP changes to ADP and Pi
Choose the option with incorrect events.

  1. Only I

  2. Only III

  3. IV and V

  4. Only II
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

I-band consists of only thin filaments. A-band consists of both the thin and thick filaments. H-zone is the band of thick filament only. For skeletal muscle contraction following events occur:

1. The nerve impulse is transmitted to the sarcolemma and it causes release of calcium ions from sarcoplasmic reticulum.
2. These calcium bind to the troponin and tropomyosin rotates. 
3. Then, the myosin binds to the tropomyosin. 
4. ATP is hydrolysed to detach the myosin from the tropomyosin and muscle can be relaxed.
The shortening of I-band and H-zone causes the contraction of sarcomere. 
A-band does not change.
Hence, the correct answer is 'only II'

Multiple choice muscle contraction locomotion and movements biology

Which responce to overcooling does not does not involve muscle contraction?

  1. Blood vessels narrowing

  2. Hairs standing up

  3. Shivering

  4. Reduced sweating
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood vessels narrowing, hairs standing up and shivering are all because of contraction of muscles. While reduced sweating is due to non-activation of sweat glands from the hypothalamus.

So, the correct option is 'reduced sweating'.

Multiple choice muscle contraction locomotion and movements biology

Which cell organelle is associated with muscle contraction by release and uptake of $Ca^{2+}$ ions?

  1. Golgi apparatus

  2. RER

  3. Sarcoplasmic reticulum

  4. Lysosome
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

SER is associated with muscle contraction by release and uptake of Ca ions because SER functions as the packaging structure which stores the Ca ions until its release.

So, the correct option is 'SER'.

Multiple choice muscle contraction locomotion and movements biology

Match the following and mark the correct option.

Column I Column II
A. Fast muscle fibres i. Myoglobin
B. Slow muscle fibres ii. Lactic acid
C. Actin filament iii. Contractile unit
D. Sarcomere iv. I-band

  1. A-i, B-ii, C-iv, D-iii

  2. A-ii, B-i, C-iii, D-iv

  3. A-iii, B-ii, C-iv, D-i

  4. A-ii, B-i, C-iv, D-iii
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
a) Fast muscle fibres -  They have a large amount of myoglobin which is resistant to fatigue. 
b) Slow muscles fibres - These type of fibres show a slow 'tunic' contraction characteristic of postural muscles. The lactic acid is produced during muscle contraction.
c) Actin filament - The light bands present in myofibrils contain actin and is called I-band or isotropic band.
d) Sarcomere - It is the contractile unit of muscle fibres.

So, the correct answer is 'A-i, B-ii, C-iv, D-iii'.
Multiple choice muscle contraction locomotion and movements biology

Which one of the following option gives the correct categorisation of structure of contractile proteins ?

Actin  Myosin
1 Troponin Actinin
2 Troponin tropomyosin HMM and LMM
3 'G' - actin Tropomyosin
4 Tropomyosin troponin $Ca^{++}$ binding site

  1. 1

  2. 2

  3. 3

  4. 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Troponin is attached protein tropomyosin and lies within the groove between actin filaments in the muscle tissue. The calcium attaches the troponin which changes the shape exposing binding sites for myosin on the actin filament. So the correct answer is 1.

Multiple choice muscle contraction locomotion and movements biology

The energy of muscle contraction is most directly obtained from____________.

  1. Phosphocreatine

  2. ATP

  3. Anaerobic respiration

  4. Aerobic respiration
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Answer :
i) The contraction of skeletal muscles is an energy-requiring process. 
ii) To perform the mechanical work of contraction, actin and myosin utilize the chemical energy of the molecule Adenosine triphosphate (ATP).
iii) Adenosine triphosphate (ATP) is a complex organic chemical that provides energy to drive many processes in living cells, e.g. muscle contraction, nerve impulse propagation, and chemical synthesis. 
iv) Found in all forms of life, ATP is often referred to as the "molecular unit of currency" of intracellular energy transfer.

Therefore correct answer is option B- ATP.


Multiple choice muscle contraction locomotion and movements biology

In isometric contraction ;-

  1. Tone changed but length same

  2. Length changed but tone same

  3. Length and tone both same

  4. Length and tone both change
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Isometric is directly defined as ‘same length’ whereby ‘iso’ means the same and ‘metric’ means ‘length’ when referring to muscles. During isometric contractions, the muscle itself does not change in length while the tension never exceeds the load that must be carried. This means that while the muscle itself does not shorten, the tension will never exceed the opposing force.

Hence, the correct answer is 'Tone changed but length same'.

Multiple choice muscle contraction locomotion and movements biology

ATP provides energy for muscle contraction by allowing for

  1. An action potential formation in the muscle cell

  2. Cross bridge detachment of myosin from actin

  3. Cross bridge detachment of myosin to actin
  4. Release of $C{a^{ + 2}}$ from sarcoplasmic rectulum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
ATP enables the actin-myosin cross-bridge to detach, and release energy through its hydrolysis to enable the myosin head to return to its resting position.
So, the correct option is Cross bridge detachment of myosin from actin.
Multiple choice muscle contraction locomotion and movements biology

During muscular contraction, the myosin head binds to the exposed active sites on actin to form a?

  1. Motor unit

  2. Motor end plate

  3. Cross bridge

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During muscle contraction, the globular head of a myosin filament binds to the exposed active binding site on an actin filament, forming a cross bridge that facilitates sliding.

Multiple choice muscle contraction locomotion and movements biology

Which of the following parts of the nephric tubule is incorrectly matched regarding osmotic concentration of filtrate in it?

  1. PCT - Isotonic

  2. Bowman's capsule - Hypotonic

  3. Ascending limp of loop of Henle - Hypotonic

  4. Descending limb of loop of Henle - Hypertonic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The PCT (Proximal Convoluted Tubule) reabsorbs water and solutes, keeping the filtrate isotonic to the blood plasma. The other options are correctly matched regarding their osmotic status.